JP2001103063A - Network monitoring device, monitoring method, and recording medium - Google Patents

Abstract

(57) [Summary] [Problem] A packet flowing on a network can be observed.
To enable easy analysis of abnormal packets flowing on the network. SOLUTION: A network I / F 101 for receiving a packet flowing on a network, and a selection switch 106 for holding a monitoring start command and monitoring time inputted from outside.
A timer 107 that counts the time from the start of packet monitoring, a comparator 108 that compares the value of the timer 107 with the monitoring time held by the selection switch 106 and detects that they match, A CPU 102 for analyzing a packet received by the I / F 101 and determining whether or not a packet has been received from when the packet monitoring is started until a match is detected by the comparator 108;
And a monitor 103 for displaying the result of the determination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network monitoring device for monitoring packets of a network system for performing data communication between a plurality of electronic control devices and information devices by a packet communication method.

[0002]

2. Description of the Related Art In recent years, with the development of LANs (Local Area Networks), information devices such as computers and multimedia devices have been connected to networks, and data from these devices has been transmitted to distant devices.

[0003] There is a network monitoring device that monitors whether devices connected to the LAN are operating normally.

Conventionally, as such a monitoring apparatus, a communication monitoring apparatus disclosed in Japanese Patent Application Laid-Open No. 9-261261 is known. This communication monitoring device is shown in FIG. The communication monitoring device shown in this figure is HDLC (High-level Data Link
Control) H is a network that uses a loop procedure
DLC loop network 1, host 10 which is the primary station of the HDLC loop procedure, terminals 21, 31, 41, and terminals 21, 31, 41 which are the secondary stations of the HDLC loop procedure, have the function of physically separating them from HDLC loop network 1. Relay 2 with
2, 32, 42, timers 24, 34, 44, monitoring of SD (Send Data) signal and RD (ReceiveData) signal and timers 24, 3
4 and 44, and SD / RD signal monitoring devices 23, 33 and 43 for controlling the relays 22, 32 and 42.

The operation of the network monitoring apparatus configured as described above will be described.

[0006] The host 10 and the terminals 21, 31 and 41 are connected in a ring type by the HDLC loop procedure. The data is transmitted from the host 10 and taken into the terminal 21 via the relay 22. After the data and the flag are added, the HDLC
It is sent to the loop network 1. Similarly, terminals 31, 41
, And returns to the host 10.

The SD / RD signal monitoring devices 23, 33, and 43 compare the RD signals of the terminals 21, 31, and 41 with the SD signals, and start timers 24, 34, and 44 when the difference is detected. Stop at no point.

[0008] If the terminal 21 becomes abnormal and tries to transmit a frame exceeding the maximum transmittable frame length, the SD / R
The timer 24 of the D signal monitoring device 23 times out,
The relay 22 is forcibly switched to the network direction. As a result, the transmission data of the terminal 21 does not flow in the HDLC loop network 1, and the transmission right moves to the terminal 31.

As described above, in the communication monitoring device disclosed in Japanese Patent Application Laid-Open No. 9-261261, the HDLC loop control mechanism of a certain terminal becomes abnormal and the maximum transmittable frame length can be obtained without relinquishing the data transmission right. Even if a situation occurs in which a frame exceeding the limit is transmitted, such a terminal is disconnected from the network by the SD / RD signal monitoring device forcibly switching the relay, and the other terminals communicate normally.

[0010]

However, in the communication monitoring device disclosed in the above publication, there is no means for indicating which terminal in the network system the terminal that has forcibly left, so that the host or the network monitoring person must It is difficult to know which terminal caused the abnormality.

When the network system becomes abnormal, it is necessary to analyze the actual packets transmitted between the devices. In the communication monitoring device, it is possible to detect a network abnormality and forcibly remove a terminal in an abnormal state from the network, but it is difficult to analyze an abnormal packet output from the terminal to the network. As a general analysis method for analyzing abnormal packets on the network, there is a method of observing packets flowing on the network with an oscilloscope.However, it is very difficult to analyze packets flowing on the network with an oscilloscope. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an object to provide a network monitoring apparatus and a monitoring method capable of observing packets flowing on a network and easily analyzing abnormal packets flowing on the network. The purpose is to provide.

[0013]

In order to solve the above-mentioned problems, a network monitoring apparatus according to the present invention comprises a receiving means for receiving a packet flowing on a network, a monitoring start command and a monitoring time inputted from outside. Holding means for holding, counting means for counting the time from the start of packet monitoring by inputting the monitoring start command, and comparing the value of the counting means with the monitoring time held by the holding means, A comparing means for detecting that the packet has been received, and analyzing the packet received by the receiving means, and judging whether or not the packet has been received from when the packet monitoring is started until a match is detected by the comparing means. A computing unit; and a display unit for displaying a result of the determination by the computing unit. With this configuration, if a packet flowing on the network is caught and the packet does not flow through the network even after a lapse of a specified time, it is possible to indicate a network abnormality.

Further, the network monitoring method of the present invention comprises:
A receiving procedure for receiving a packet flowing on the network, a holding procedure for holding a monitoring start command and a monitoring time input from the outside, and a count for counting a time since packet monitoring was started by inputting the monitoring start command. Procedure, comparing the count value of the counting procedure with the monitoring time indicated in the holding procedure, and comparing the packet with the comparing procedure for detecting the coincidence, and analyzing the packet received in the receiving procedure. An operation procedure for judging whether or not a packet has been received from the start until a match is detected in the comparison procedure is provided, and a display procedure for displaying a result of the computation procedure is provided. With this configuration, if a packet flowing on the network is caught and the packet does not flow through the network even after a lapse of a specified time, it is possible to indicate a network abnormality.

Further, the recording medium of the present invention comprises: a receiving procedure for receiving a packet flowing on a network; a holding procedure for holding a monitoring start command and a monitoring time inputted from outside; A counting procedure for counting the time from the start of monitoring, a comparison procedure for comparing the count value of the counting procedure with the monitoring time indicated in the holding procedure, and a comparing procedure for detecting a match; and a receiving procedure. Analyzing the received packet and displaying a calculation procedure for determining whether or not a packet has been received from the start of packet monitoring until a match is detected in the comparison procedure, and a determination result of the calculation procedure A network monitoring control program that causes a computer to execute the display procedure. With this configuration, it is possible to use a computer to catch packets flowing on the network, and to indicate an abnormality in the network if the packets do not flow on the network even after the designated time has elapsed.

Further, the network monitoring device of the present invention comprises:
Receiving means for receiving a packet flowing on the network, holding means for holding a monitoring start command and a monitoring packet amount input from the outside, and receiving by the receiving means after starting packet monitoring by input of the monitoring start command Counting means for counting the amount of packets received, comparison means for comparing the value of the counting means with the value of the monitoring packet amount held by the holding means, and detecting that they match, Calculating means for analyzing the received packet and determining whether a packet of the monitoring packet amount has been received based on an output of the comparing means,
Display means for displaying the result of the determination by the calculation means. With this configuration, it is possible to catch packets flowing on the network and indicate that all packets of the monitoring packet amount input from the outside have flowed on the network.

Further, the network monitoring method of the present invention comprises:
A receiving procedure for receiving a packet flowing over the network, a holding procedure for holding a monitoring start command and a monitoring packet amount input from the outside, and receiving the packet by the receiving means after starting packet monitoring by inputting the monitoring start command. A counting procedure for counting the number of packets received, a comparing procedure for comparing the count value of the counting procedure with the value of the monitoring packet quantity held by the holding unit, and detecting that they match, and a receiving procedure for the receiving procedure. And a display step of displaying the determination result of the calculation procedure based on an output of the comparison procedure. Was. With this configuration, it is possible to catch packets flowing on the network and indicate that all packets of the monitoring packet amount input from the outside have flowed on the network.

Further, the recording medium of the present invention is provided by a receiving procedure for receiving a packet flowing on a network, a monitoring start command and a holding procedure for holding a monitoring packet amount input from the outside, and an input of the monitoring start command. A counting procedure for counting the amount of packets received in the receiving procedure after starting packet monitoring, and comparing the count value of the counting procedure with the value of the monitoring packet quantity held in the holding procedure, and finding that they match. And comparing the packet received in the receiving procedure,
A network monitoring control program that causes a computer to execute an arithmetic procedure for determining whether a packet of the monitoring packet amount has been received based on the output of the comparison procedure and a display procedure for displaying a determination result of the arithmetic procedure. It has a recorded configuration. With this configuration, it is possible to use a computer to catch packets flowing on the network and to indicate that all packets of the monitoring packet amount input from the outside have flowed on the network.

Further, the network monitoring device of the present invention
Receiving means for receiving a packet flowing on the network, holding means for holding a monitoring start command and a maximum value and a minimum value of a monitoring packet cycle inputted from the outside, and receiving by the receiving means by the input of the monitoring start command Measuring means for measuring the period of the packet, and comparing the measured value of the measuring means with the maximum value and the minimum value held by the holding means, the measured value is out of the range from the maximum value to the minimum value Comparing means for detecting whether or not the packet is received, and analyzing the packet received by the receiving means, and based on the output of the comparing means, the cycle of the received packet is from the maximum value to the minimum value. A calculation means for determining whether the value is out of the range and a display means for displaying a result of the determination by the calculation means are provided. With this configuration, it is possible to catch a packet flowing on the network and to indicate that the station has output to the network a packet having an abnormal cycle that does not satisfy the packet cycle.

Further, the network monitoring method of the present invention comprises:
A receiving procedure for receiving a packet flowing over the network, a monitoring start command input from outside, and a holding procedure for holding a maximum value and a minimum value of a monitoring packet cycle; A measuring procedure for measuring the cycle of the packet, and comparing the measured value of the measuring procedure with the maximum value and the minimum value held by the holding unit, and the measured value is out of the range from the maximum value to the minimum value. A comparison procedure for detecting whether or not is, and analyzing the packet received in the reception procedure, the cycle of the received packet based on the output of the comparison procedure from the maximum value to the minimum value A calculation procedure for determining whether the value is out of the range and a display procedure for displaying a determination result of the calculation means are provided. With this configuration, it is possible to catch packets flowing on the network and indicate that the station has output to the network a packet having an abnormal cycle that does not satisfy the prescribed packet cycle.

Further, the recording medium of the present invention includes a receiving procedure for receiving a packet flowing on a network, a monitoring start command input from outside, and a holding procedure for holding a maximum value and a minimum value of a monitoring packet cycle. By inputting a monitoring start command, a measurement procedure for measuring the cycle of the packet received in the reception procedure, and comparing the measurement value of the measurement procedure with the maximum value and the minimum value held in the holding procedure, A comparison procedure for detecting whether the value is out of the range from the maximum value to the minimum value, and analyzing the packet received in the reception procedure, the received procedure based on the output of the comparison procedure. The computer causes the computer to execute a calculation procedure for determining whether or not a packet cycle is out of the range from the maximum value to the minimum value, and a display procedure for displaying a determination result of the calculation means. Having recorded configure Ttowaku monitor control program. With this configuration, it is possible to use a computer to catch a packet flowing on the network, and to indicate that the station has output to the network a packet having an abnormal cycle that does not satisfy the packet cycle.

Also, the network monitoring device of the present invention
It is provided with wireless two-way communication means, and is controlled by an external device belonging to an external network independent of the network to which the network monitoring device belongs. With this configuration, a device belonging to an external network independent of the network to which the network control device belongs can control the network control device.

Also, the network monitoring device of the present invention
A transmission / reception unit for weak radio waves is used as a wireless two-way communication unit, and data recording the state of the network is transmitted to the outside by the transmission / reception unit. With this configuration, the network control device can be controlled by an external device belonging to an independent external network from the network to which the network control device belongs, and the state of the network can be externally controlled by wireless communication. Can be notified to

Also, the network monitoring device of the present invention
Metal wiring having the function of an antenna is formed on the same substrate together with all means of the network monitoring device. With this configuration, even when the communication means is wireless, there is no need to prepare an antenna outside the device as a communication device, no wiring is required, the number of components is reduced, and the board mounting surface can be reduced in size. it can.

Further, the network monitoring device of the present invention
Optical communication is used as wireless two-way communication, and data recording the state of the network is transmitted to an external device by the transmission / reception means. With this configuration, the status of the network can be notified to the external device by optical communication.

Further, the network monitoring device of the present invention
It has a configuration in which a photodiode serving as a receiving element for optical communication and an LED or laser diode serving as a transmitting element for optical communication are formed on the same substrate together with all means of the network monitoring device. With this configuration, even when the communication means is light, there is no need to prepare an optical module as a communication device, no wiring is required, and the board mounting surface can be reduced in size.

Further, the network monitoring device of the present invention comprises:
The transmission / reception system has a configuration based on the IrDA standard. With this configuration, highly reliable communication is possible.

Further, the network monitoring apparatus of the present invention
It has a configuration provided with an interface means for connecting a detachable auxiliary storage electronic device to transmit and receive various data.
With this configuration, the result of monitoring the network can be taken out of the network monitoring device.

Also, the network monitoring device of the present invention
The interface means has a configuration based on the PCMCIA standard. With this configuration, it is possible to use a world standard mass storage device used in a personal computer as a storage device for storing monitoring results.

Further, the network monitoring device of the present invention
It has a configuration provided with display means for displaying the monitoring result in a diagram. With this configuration, the network monitor can visually determine the state of the network.

Further, the network monitoring apparatus of the present invention
Audio data reproduction means, frequency analysis means for creating frequency distribution data of audio data from the audio data reproduction means, graph display means capable of displaying a graph, and connection to the frequency distribution data from the frequency analysis means and a network And switching means for switching the packet type distribution data output from each of the stations and outputting the data to the graph display means. With this configuration,
There is no need to prepare a new display device for displaying the network analysis result, and the network monitor can visually determine the state of the network.

Further, the network monitoring apparatus of the present invention
Audio data reproducing means, frequency analyzing means for creating frequency distribution data of audio data from the audio data reproducing means, display means capable of displaying a graph, and frequency distribution data from the frequency analyzing means and connected to a network And switching means for switching the packet type distribution data output from each station and outputting the data to the graph display means. With this configuration, there is no need to prepare a new display device for displaying the network analysis result, and the network monitor can visually determine the state of the network.

Further, the network monitoring apparatus of the present invention
It has a configuration in which sound source means for indicating a station on the network where a failure has occurred by voice is formed on the same substrate. With this configuration, even if the user is away from the network monitoring device, the analysis result can be confirmed only by voice without visually checking the analysis result, and no wiring is required, and the mounting surface of the board can be reduced in size. it can.

Further, the network monitoring device of the present invention
The sound generated by the sound source means has a structure including means for changing a pitch according to a station in which a failure has occurred. With this configuration, even when the user is away from the network monitoring device, the analysis result is not visually checked, and the voice or
The analysis result can be known from the pitch.

Further, the network monitoring device of the present invention
Means for connecting to an external network independent of the network to which the network monitoring device belongs; instruction table means for recording an instruction set referred to by a processing unit of a control device belonging to the external network; A determination unit that determines whether an instruction set in the instruction table unit is included from the data packet; and a determination unit that determines that the data packet includes the instruction set in the instruction table unit. Erasing means for erasing the data packet. With this configuration, it is possible to prevent a device connected to the network to which the network monitoring device belongs from being controlled from outside without permission.

Further, the network monitoring apparatus of the present invention
It has a configuration provided with communication data storage means for storing communication data from an external network. With this configuration, the network monitor can know that the network system to which the network monitoring device belongs has been accessed without permission from the external network by analyzing the recorded communication data.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

(First Embodiment) In a first embodiment of the present invention, a network monitoring device for monitoring an in-vehicle information LAN to which an operation panel, a car navigation device, and a monitor are connected is provided on a network. If the packet does not flow through the network even after the set monitoring time has elapsed, a network abnormality is displayed.

FIG. 1 shows a basic configuration of a network monitoring apparatus according to a first embodiment of the present invention.

This network monitoring device comprises a sequencer
And a monitor 103 connected to the sequencer 109. The sequencer 109 is connected to the in-vehicle information LAN to be monitored. The in-vehicle information LAN is, for example, Ethernet (registered trademark) (Ethernet (registered trademark)), and an operation panel 111, a car navigation device (hereinafter, referred to as car navigation) 112, and a monitor 113 are connected.

The sequencer 109 has a system bus. The system bus has a function equivalent to two layers from the OSI reference model 1 and has a network interface (hereinafter, referred to as a network interface) for transmitting and receiving data packets to and from the onboard information LAN.
A network I / F 101; a CPU 102 that controls the system and analyzes data packets received by the network I / F 101; and a ROM (Read Only Memory) 104 in which a program indicating a control procedure of the CPU 102 is stored in advance.
A random access memory (RAM) 105 as a data storage element for storing the calculation result of the CPU 102, a station which the network monitor wants to monitor, a monitoring time, a selection switch 106 for setting monitoring start and stop, a CPU 102, A timer 107 for starting or stopping measuring time according to an instruction from a comparator 108 described later, a selection switch 106 and a timer
Comparator 1 composed of exclusive OR that compares the value with 107
08 and are connected. A monitor 103 for displaying characters is connected to the CPU 102.

The selection switch 106 includes a switch A for setting the address of the device on the data packet transmitting side and a switch B for setting the address of the device on the data packet receiving side.
A switch C for inputting a monitoring start / stop command,
and a switch D capable of setting a monitoring time in s units.

Network I / F 101, CPU 102, RO
The M104, the RAM 105, the selection switch 106, the timer 107, and the comparator 108 are integrated on a single large silicon substrate, and constitute a sequencer 109 for controlling the entire network monitoring apparatus. The control method of the network monitoring device is realized by a program stored in the ROM 104.

The network I / F 101 and the CPU 10
2, ROM104, RAM105, selection switch 106, timer 10
7. Since the comparator 108 is connected to the system bus monitored by the CPU 102, each block can share data with each other.

Operation panel 11 connected to in-vehicle information LAN
Reference numeral 1 denotes an operation panel for the user to control the device, and the address is “1”. The address of the car navigation system 112 connected to the in-vehicle information LAN is “2” and the monitor 113
Is "3".

Sequencer 109, operation panel 111, car navigation
The in-vehicle information LAN system includes the 112 and the monitor 113.

The signal flow in the network monitoring device configured as described above will be described. Here, a case where the operation panel 111 monitors whether or not one map enlargement instruction data packet is transmitted to the car navigation system 112 is taken as an example.

As shown in FIG. 1, since the network is of the bus type, data packets are transmitted to all devices connected to the network. When the switch C of the selection switch 106 is set to “monitoring stopped”, the network I / F 101 and the CPU 102 have stopped the network monitoring process. When the switch C of the selection switch 106 is set to “monitoring start”, the network I / F
101 and the CPU 102 execute a network monitoring process.

The network monitor selects the switch 106
Switch A is set to “1” and switch B of the selection switch 106
Is set to “2”, the switch D of the selection switch 106 is set to “monitoring period 100 ms”, and the switch C of the selection switch 106 is
To “Start monitoring”.

When the switch C of the selection switch 106 is set to “monitoring start”, the CPU 102 instructs the timer 107 to start time measurement. The network I / F 101 outputs a value of “1” to the system bus when capturing a data packet flowing in the network, converts the captured data packet into a data packet that can be decoded by the CPU 102, and converts the value into a data packet. Transfer to CPU102. When the CPU 102 completes the data packet acquisition, the network I / O
F101 outputs a value of “0” to the system bus.

The CPU 102 operates according to the program stored in the ROM 104, and uses the network I / F1 while using the RAM 105 as a storage element for storing the operation result.
Analyze the value obtained from 01. Then, the operation panel 111
When it is analyzed that the packet is a data packet from the user to the car navigation system 112, the timer 107 is stopped, and the character data of "completion of transfer detection from address 1 to address 2" is also displayed on the monitor 103 together with the state of the selection switch 106. Output to

The comparator 108 outputs a value of "0" to the system bus when the value of the timer 107 matches the value of the switch D of the selection switch 106, and outputs "1" when the value does not match. I do. If they match, the timer 107 is stopped. When the value of the comparator 108 is determined to be “0”, the CPU 102 also determines the state of the selection switch 106 and
The character data “Transfer not detected from address 1 to address 2” is output to the monitor 103. The monitor 103 is a CPU
From the data of 102, the characters "transfer detection from address 1 to address 2 is completed" or "transfer not detected from address 1 to address 2" is displayed on the screen.

Next, a detailed control procedure of the network monitoring device in the device of FIG. 1 will be described with reference to FIG.

First, the CPU 102 determines whether or not the switch C of the selection switch 106 is set to "monitoring started" (step S01). Switch C of selection switch 106
Is not set to "monitoring start", the process returns to step S01.

If the switch C of the selection switch 106 is set to "monitoring start", the timer 107 is instructed to start measuring time (step S02), and the network I / F 101 is started.
Determines whether a data packet has been received (step S03).

When the CPU 102 obtains the value “1” from the network I / F 101, the CPU 102 determines that a data packet has been received, obtains the data packet from the network I / F 101 (step S04), A sender address is extracted from the acquired data packet (step S05).

Then, it is determined whether or not the transmission side address matches the address set in the switch A (step S06). If the sender address matches the address set in switch A (Y in step S06)
ES), extract the receiving side address from the acquired data packet (step S07), and set the receiving side address and switch B
Then, it is determined whether or not the address set in (1) matches (step S08).

If the address on the receiving side matches the address set in the switch B (YES in step S08),
The character data "Transfer detection from address 1 to address 2 is completed" is output to the monitor 103 (step S09), and the process proceeds to step S01.

When the CPU 102 acquires a value “0” from the network I / F 101 (NO in step S03),
It is determined whether the value of the timer 107 matches the monitoring period (= 100 ms) set in the switch D of the selection switch 106 (step S10). If the value of the timer 107 matches the monitoring cycle set in the switch D of the selection switch 106 (NO in step S10), the process proceeds to step S03.

If the value of the timer 107 does not match the monitoring cycle set in the switch D of the selection switch 106 (YES in step S10), the monitor 103 is instructed that "the transfer from address 1 to address 2 has not been detected". The character data is output (step S11), and the process proceeds to step S01.

When the address on the transmission side does not match the address set in the switch A (N in step S06)
O), proceed to step S03. Similarly, if the receiving address does not match the address set in the switch B (NO in step S08), the process proceeds to step S03.

As described above, according to the first embodiment of the present invention, packets flowing on the network are captured, and the packets flow on the network even after the specified time (monitoring time set in the selection switch 106) has elapsed. If there is no network error, the network 103 can be easily confirmed by the monitor 103.

In FIG. 1, the function of the network monitoring device is executed by a program stored in the ROM 104. The program is transferred to a magnetic disk, a magneto-optical disk, an IC card, a PD, a DVD-RO external to the sequencer 109.
By storing the information in a recording medium such as M, DVD-RAM, ROM, or RAM, and reading it out with a computer, the function of the network monitoring device can be realized using the computer.

(Second Embodiment) In a second embodiment of the present invention, a network monitoring device for monitoring an in-vehicle information LAN to which an operation panel, a car navigation system, and a monitor are connected flows on a network. Capture the packet,
This indicates that all the packets specified between the data transmitting station and the data receiving station specified by the network monitor have flowed through the network.

FIG. 3 shows a basic configuration of a network monitoring apparatus according to a second embodiment of the present invention.

This network monitoring device has a sequencer
309 and a monitor 303 connected to the sequencer 309. The sequencer 309 is connected to the in-vehicle information LAN to be monitored. The in-vehicle information LAN is, for example, Ethernet, and includes an operation panel 311 and a car navigation system 312.
And the monitor 313 are connected.

The sequencer 309 has a system bus. The system bus has a function equivalent to two layers from the OSI reference model 1, and has a network I / F 301 for transmitting and receiving data packets to and from the in-vehicle information LAN, and a system for controlling the system and data received by the network I / F 301. A CPU 302 for analyzing a packet, a ROM 304 in which a program indicating a control procedure of the CPU 302 is stored in advance,
RAM 305, which is a data storage element for storing the calculation result of CPU 302, a station which the network monitor wants to monitor, a monitoring packet amount, a selection switch 306 for setting monitoring start and stop, and a packet number of 1 according to an instruction from CPU 302 A counter 307 that is incremented or reset to “0” and a comparator 308 formed by an exclusive OR for comparing the values of the selection switch 306 and the counter 307 are connected. A monitor 303 for displaying characters is connected to the CPU 302.

The selection switch 306 includes a switch A for setting the address of the device on the data packet transmitting side and a switch B for setting the address of the device on the data packet receiving side.
And a switch C for inputting a monitoring start / stop command, and a switch D for setting a monitoring packet amount.

Network I / F 301, CPU 302, RO
The M304, the RAM 305, the selection switch 306, the counter 307, and the comparator 308 are integrated on one large silicon substrate, and constitute a sequencer 309 for controlling the entire network monitoring apparatus. The control method of the network monitoring device is realized by a program stored in the ROM 304.

The network I / F 301 and the CPU 30
2, ROM 304, RAM 305, selection switch 306, counter
Since the comparator 307 and the comparator 308 are connected to the system bus monitored by the CPU 302, the blocks can share data with each other.

Operation panel 31 connected to in-vehicle information LAN
Reference numeral 1 denotes an operation panel for the user to control the device, and the address is “1”. The address of the car navigation system 312 connected to the in-vehicle information LAN is “2”,
Is "3".

Sequencer 309, operation panel 311, car navigation
The 312 and the monitor 313 form an onboard information LAN system.

The signal flow in the network monitoring apparatus configured as described above will be described. Here, the car navigation system 312 sends a map data packet to the monitor 313 for 10 minutes.
An example will be given of a case where it is monitored whether or not 0 data is transmitted.

As shown in FIG. 3, since the network is of a bus type, data packets are transmitted to all devices connected to the network. When the switch C of the selection switch 306 is set to “stop monitoring”, the network I / F 301 and the CPU 302 have stopped the network monitoring process. When the switch C of the selection switch 306 is set to “start monitoring”, the network I / F
301 and the CPU 302 execute network monitoring processing.

The network monitor selects the selection switch 306
Switch A of "2", switch B of selection switch 106
Is set to “2”, the switch D of the selection switch 106 is set to “monitoring packet amount 100”, and the switch C of the selection switch 306 is set to “monitoring started”.

When the switch C of the selection switch 306 is set to “monitoring start”, the CPU 302 resets the counter 307 to “0”. The network I / F 301 outputs a value of “1” to the system bus when a data packet flowing through the network is captured, converts the captured data packet into a data packet that can be decoded by the CPU 302, and outputs the value. To the CPU 302. When the CPU 302 completes the acquisition of the data packet, the network I / F 301
Outputs a value of "0" to the system bus.

The CPU 302 operates according to the program stored in the ROM 304, and uses the network I / F 3 while using the RAM 305 as a storage element for storing the operation result.
Analyze the value obtained from 01. Then, when it is analyzed that the data packet is sent from the car navigation system 312 to the monitor 313, the value of the counter 307 is incremented by one.

When the value of the counter 307 matches the value of the packet amount set in the switch D of the selection switch 306, the comparator 308 outputs a value of “0” to the system bus. Outputs “1”.

When the value of the comparator 308 is determined to be "0", the CPU 302 outputs character data "Completion of transfer of 100 packets from address 2 to address 3" together with the state of the selection switch 306. I do.

Next, a detailed control procedure of the network monitoring device in the device of FIG. 3 will be described with reference to FIG.

First, the CPU 302 determines whether or not the switch C of the selection switch 306 is set to "monitoring start" (step S41). Switch C of selection switch 306
Is not set to "monitoring started", the process returns to step S41. The switch C of the selection switch 306 is
If "monitoring started" is set, the counter 307 is instructed to be reset to "0" (step S42),
It is determined whether the value of the counter 307 matches the value of the packet amount set in the switch D of the selection switch 306 (step S43).

When the value of the counter 307 matches the value of the packet amount set in the switch D of the selection switch 306 (YES in step S43), the CPU 302
Then, the character data "Completion of transfer of 100 packets from address 2 to address 3" is output (step S44), and the process proceeds to step S41. If the value of the counter 307 does not match the value of the packet amount set in the switch D of the selection switch 306 (NO in step S43), it is determined whether the network I / F 301 has received a data packet. A determination is made (step S45).

When the CPU 302 acquires a value “0” from the network I / F 301 (NO in step S45),
The process moves to step S45 again. When the CPU 302 obtains the value “1” from the network I / F 301 (YES in step S45), the CPU 302 determines that a data packet has been received, and transmits the data packet to the network I / F 301.
/ F301 (step S46), and extracts the sender address from the acquired data packet (step S4).
7), it is determined whether or not the sender address matches the address set in switch A (step S4)
8).

When the address on the transmission side matches the address set in the switch A (YE in step S48)
S), the receiving address is extracted from the acquired data packet (step S49), and the receiving address and the switch B are extracted.
It is determined whether or not the address set in (1) matches (step S50).

When the receiving address matches the address set in the switch B (YE in step S50)
S), instruct the counter 307 to increment the value by 1 (step S51), and shift to step S43.

If the address on the transmitting side does not match the address set in the switch A (N in step S48)
O), proceed to step S45. If the receiving address does not match the address set in the switch B (NO in step S50), the process proceeds to step S45.

As described above, according to the second embodiment of the present invention, packets flowing on the network are captured, and the amount of packets specified between the data transmitting station and the data receiving station specified by the network monitor is completely reduced. It can be easily confirmed from the monitor that the data has flowed through the network.

In FIG. 3, the function of the network monitoring device is executed by a program stored in the ROM 304. The program is transferred to a magnetic disk, a magneto-optical disk, an IC card, a PD, a DVD-RO external to the sequencer 309.
By storing the information in a recording medium such as M, DVD-RAM, ROM, or RAM, and reading it out with a computer, the function of the network monitoring device can be realized using the computer.

(Third Embodiment) In a third embodiment of the present invention, a network monitoring device that monitors an on-vehicle information LAN to which an operation panel, a car navigation system, and a monitor are connected flows on a network. Capture the packet,
Indicates that a packet with an abnormal cycle that does not satisfy the packet cycle has been output to the network.

FIG. 5 shows a basic configuration of a network monitoring apparatus according to a third embodiment of the present invention.

This network monitoring device is composed of a sequencer
509, and a monitor 503 connected to the sequencer 509. The sequencer 509 is connected to the in-vehicle information LAN to be monitored. The in-vehicle information LAN is, for example, Ethernet, and includes an operation panel 511 and a car navigation system 512.
And the monitor 513 are connected.

The sequencer 509 has a system bus. The system bus has a function equivalent to two layers from the OSI reference model 1, and has a network I / F 501 for transmitting and receiving data packets to and from the in-vehicle information LAN, and a system for controlling the system and receiving data received by the network I / F 501. A CPU 502 for analyzing a packet, a ROM 504 in which a program indicating a control procedure of the CPU 502 is stored in advance,
RAM 505, which is a data storage element for storing the calculation result of the CPU 502, and a selection switch 50 for setting a station desired by the network monitor to monitor, a cycle value, and monitoring start and stop.
6, a timer 507 that starts or stops measuring time according to an instruction from the CPU 502 and a comparator 508 described later, and a comparator configured by an exclusive OR that compares the values of the selection switch 506 and the timer 507. 508 is connected. A monitor 503 for displaying characters is connected to the CPU 502.

The selection switch 506 includes a switch A for setting the address of the device on the data packet transmitting side and a switch B for setting the address of the device on the data packet receiving side.
And a switch C for inputting a monitoring start / stop command, a switch D for setting the maximum value of the period of the monitoring packet, and a switch E for setting a minimum value of the period of the monitoring packet. The setting unit of the switches D and E is μs.

The comparator 508 compares the value set in the switch D of the selection switch 506 with the value of the timer 507, and compares the value set in the switch E of the selection switch 506 with the value of the timer 507. And a block B to be compared. The block A outputs “1” when the value set in the switch D is smaller than the timer value, and outputs “0” otherwise. When the value set in the switch E is larger than the timer value, the block B sets “1”.
Is output, and in other cases, “0” is output. The output value of the comparator 508 is the logical product of the block A and the block B. When the value of the timer 507 is between the value set in the switch D and the value set in the switch E, it becomes “1”. Otherwise, it is "0".

Network I / F 501, CPU 502, RO
The M504, the RAM 505, the selection switch 506, the timer 507, and the comparator 508 are integrated on one large silicon substrate, and constitute a sequencer 509 for controlling the entire network monitoring device from these components. The control method of the network monitoring device is realized by a program stored in the ROM 504.

The network I / F 501 and the CPU 50
2, ROM 504, RAM 505, selection switch 506, timer 50
7. Since the comparator 508 is connected to the system bus monitored by the CPU 502, each block can share data with each other.

Operation panel 51 connected to in-vehicle information LAN
Reference numeral 1 denotes an operation panel for the user to control the device, and the address is “1”. The address of the car navigation system 512 connected to the in-vehicle information LAN is “2” and the monitor 513
Is "3".

Sequencer 509, operation panel 511, car navigation
The 512 and the monitor 513 form an onboard information LAN system.

The signal flow in the network monitoring apparatus configured as described above will be described. Here, an example will be described in which the car navigation 512 monitors whether the cycle of the data packet transmitted to the monitor 513 satisfies the standard. Here, the standard of the packet cycle is that the maximum value is 11
0 μs and the minimum value is 90 μs.

As shown in FIG. 5, since the network is of a bus type, data packets are transmitted to all devices connected to the network. When the switch C of the selection switch 506 is set to “stop monitoring”, the network I / F 501 and the CPU 502 have stopped the network monitoring process. When the switch C of the selection switch 506 is set to “monitoring start”, the network I / F
501 and the CPU 502 execute network monitoring processing.

The network monitor selects the selection switch 506
Of the selection switch 506 to “2”, switch B to “3”, switch D
Is "110", switch E is "90", and selection switch 50 is
The switch C of No. 6 is set to "monitoring start".

When the switch C of the selection switch 506 is set to "monitoring started", the CPU 502 resets the timer 507 to "0". The network I / F 501 outputs a value of “1” to the system bus when capturing a data packet flowing in the network, converts the captured data packet into a data packet that can be decoded by the CPU 502, and converts the value into a data packet. Transfer to CPU502. When the CPU 502 completes the acquisition of the data packet, the network I / F 501
Outputs a value of "0" to the system bus.

The CPU 502 operates according to the program stored in the ROM 504, and uses the network I / F 5 while using the RAM 505 as a storage element for storing the operation result.
When analyzing that the value obtained from 01 is a data packet from the car navigation 512 to the monitor 513, the value of the comparator 508 is obtained.

When the value of the comparator 508 is "0", the CPU 502
Determines that a packet outside the packet period has been obtained,
"Packet out of cycle from address 2 to address 3"
Is output to the monitor 503. Monitor 503
Displays, on the screen, the words "Packet generation from address 2 to address 3 with non-standard period" from the data of CPU 502. When the value of the comparator 508 is “1”, the CPU 502
Determines that the data packet has a cycle that satisfies the standard, and outputs to the monitor 503 the character data "packet generation from address 2 to address 3". The monitor 503 is connected to the CPU 50
From the data of No. 2, the character “Packet generation from address 2 to address 3” is displayed on the screen.

Next, a detailed control procedure of the network monitoring device in the device of FIG. 5 will be described with reference to FIG.

First, the CPU 502 determines whether or not the switch C of the selection switch 506 is set to "monitoring started" (step S61). Switch C of selection switch 506
Is not set to "monitoring start", the process returns to step S61.

When the switch C of the selection switch 506 is set to "monitoring start", the timer 507 is instructed to start measuring time (step S62), and the network I / F 501 is started.
Determines whether a data packet has been received (step S63).

When the CPU 502 obtains a value “1” from the network I / F 501 (YES in step S63),
The CPU 502 determines that the data packet has been received, and acquires the data packet from the network I / F 501 (step S64). Then, the transmitting side address is extracted from the acquired data packet (step S65), and it is determined whether or not the transmitting side address matches the address set in the switch A (step S66).

When the transmission side address matches the address set in the switch A (step
(YES in S66), the receiving address is extracted from the acquired data packet (step S67), and it is determined whether the receiving address matches the address set in the switch B (step S68).

If the address on the receiving side matches the address set in the switch B (YE in step S68)
S), it is determined whether the value of the comparator 508 is “0” (step S69). If the value of the comparator 508 is "1" (NO in step S69), the CPU 502 determines that a packet having a nonstandard cycle has been obtained, and calls "generation of nonstandard packet from address 2 to address 3". Monitor character data
Output to 503 (step S70), and proceed to step S61. When the value of the comparator 508 is “0” (YE in step S69)
S), it is determined that the data packet has a cycle that satisfies the standard, and the character data "packet generation from address 2 to address 3" is output to the monitor 503 (step S71).
Move to step S61.

When the CPU 502 obtains a value “0” from the network I / F 501, the CPU 502 determines that a data packet has not been received (N in step S63).
O), repeat step S63. If the sending address does not match the address set in the switch A (NO in step S66), the process proceeds to step S63. If the receiving side address does not match the address set in the switch B (NO in step S68), step S63 is performed.
Move to.

As described above, according to the third embodiment of the present invention, it is easier than a monitor to catch a packet flowing on the network and output a packet having an abnormal cycle that does not satisfy the packet cycle to the network. Can be confirmed.

In FIG. 5, the function of the network monitoring device is executed by a program stored in the ROM 504. This program is stored in a magnetic disk, a magneto-optical disk, an IC card, a PD, a DVD-RO external to the sequencer 509.
By storing the information in a recording medium such as M, DVD-RAM, ROM, or RAM, and reading it out with a computer, the function of the network monitoring device can be realized using the computer.

(Fourth Embodiment) In a fourth embodiment of the present invention, a network monitoring device for monitoring an in-vehicle information LAN to which an operation panel, a car navigation system, and a monitor are connected flows on a network. When a packet is captured and the packet does not flow through the network even after the specified time has elapsed, a network abnormality is displayed and the network is monitored by a personal computer belonging to an external network independent of the network. The device can be controlled.

FIG. 7 shows a basic configuration of a network monitoring apparatus according to a fourth embodiment of the present invention.

This network monitoring device has a sequencer
709. The sequencer 709 is connected to the in-vehicle information LAN to be monitored. In-vehicle information LAN
Is an Ethernet, for example, to which an operation panel 721, a car navigation system 722, and a monitor 723 are connected. The sequencer 709 is configured to enable IrDA data communication with a personal computer (hereinafter, referred to as a personal computer) 714 connected to a LAN independent of the in-vehicle information LAN.

The sequencer 709 has a system bus. The system bus has a function equivalent to two layers from the OSI reference model 1, and has a network I / F 701 for transmitting and receiving data packets to and from the on-board information LAN, and a system bus for controlling the system and receiving data received by the network I / F 701. CPU 702 for analyzing packets, and 640 × 480 L
An LED display unit 703 having an ED for displaying characters, and a CP
ROM 704 in which a program indicating the control procedure of U702 is stored in advance, RAM 705 which is a data storage element for storing the calculation result of CPU 702, and selection for holding information of the station which the network monitor wants to monitor and the monitoring time A register 706 and a timer 707 which starts and stops measuring time according to commands from the CPU 702 and a comparator 708 described later.
And a comparator 708 formed of an exclusive OR for comparing the values of the selection register 706 and the timer 707, and an A / D converter 711.
And the D / A converter 713 are connected. And A
The photodiode 710 is connected to the / D converter 711,
The LED 712 is connected to the / A converter 713.

The selection register 706 sets a register A holding the address of the data packet transmitting side, a register B holding the address of the data packet receiving side, a monitoring time, and issues a monitoring start / stop instruction. It has a register C to be held and a register D for which a monitoring time can be set in units of 1 ms.

[0119] The photodiode 710 receives the infrared data transmitted by the personal computer 714 and outputs it to the A / D converter 711. The A / D converter 711 amplifies the input signal and converts it into a digital signal. The D / A converter 713 converts the data output from the CPU 702 into an analog signal and outputs the analog signal to the LED 712. LED 712 converts the input signal to infrared light,
Send to 14.

Network I / F 701, CPU 702, LE
D display unit 703, ROM 704, RAM 705, selection register 70
6, timer 707, comparator 708, photodiode 710, A /
The D converter 711, the LED 712, and the D / A converter 713
Sequencer 50 integrated on one large silicon substrate and controlling the entire network monitoring device from these
Make up 9. The control method of the network monitoring device is realized by a program stored in the ROM 704.

The network I / F 701, the CPU 70
2. The LED display unit 703, ROM 704, RAM 705, selection register 706, timer 707, comparator 708, A / D converter 711, and D / A converter 713 are connected to the system bus monitored by the CPU 702. Each block can share data with each other.

Operation panel 72 connected to in-vehicle information LAN
Reference numeral 1 denotes an operation panel for the user to control the device, and the address is “1”. The address of the car navigation system 722 connected to the in-vehicle information LAN is “2”,
Is "3".

Sequencer 709, operation panel 721, car navigation
The 722 and the monitor 723 form an onboard information LAN system.

The personal computer 714 is used by a network monitor to control the network controller, and is a personal computer connected to a LAN independent of the network.

The signal flow of the network monitoring apparatus configured as described above will be described. Here, the operation panel 72
An example will be described in which it is monitored whether or not one map enlargement instruction data packet is transmitted from 1 to the car navigation 722.

Since the network is of the bus type as shown in FIG. 7, data packets are transmitted to all the devices connected to the network. When the network monitor wants to monitor the network, the personal computer 714 uses the IrDA function of transmitting and receiving data by infrared rays to the photodiode 710 to send the address of the data packet transmitting side, the address of the data packet receiving side, the monitoring time, And issue a monitoring start instruction. In the present embodiment, the network monitor sets the address of the data packet transmitting side to “1”, the address of the data packet receiving side to “2”, sets the monitoring time to 100 ms, and issues a monitoring start command from the personal computer 714 to the sequencer 709. Issue for

The photodiode 710 receives the data from the personal computer 714, converts the infrared rays into analog signals, and performs A / D conversion.
The data is sent to the converter 711. The A / D converter 711 converts an analog signal into a digital signal and sends the digital signal to the CPU 702.

When the CPU 702 determines that the digital signal is the address of the data packet transmitting side, the selection register 706
Data is held in the register A. In addition, the CPU 702
Causes the register B of the selection register 706 to hold the data when the digital signal is determined to be the address of the data packet receiving side. Further, when the CPU 702 determines that the digital signal is a monitoring start command, the CPU 702 causes the register C of the selection register 706 to hold data. When the CPU 702 determines that the digital signal is the monitoring time, the selection register 706
The data is held in the register D.

When the register C of the selection register 706 is set to "monitoring stopped", the network I / F 701, C
The PU 702 has stopped the network monitoring process.
When the register C of the selection register 706 is set to “monitoring started”, the network I / F 701 and the CPU 702 execute a network monitoring process.

When the register C of the selection register 706 is set to "monitoring start", the CPU 702 instructs the timer 707 to start measuring time.

The network I / F 701 outputs a value of “1” to the system bus when capturing a data packet flowing in the network, and converts the captured data packet into a data packet that can be decoded by the CPU 702. The value is passed to the CPU 702. When the CPU 702 completes the data packet acquisition, the network I / F 701
The value "0" is output to the system bus.

The CPU 702 operates according to the program stored in the ROM 704, and uses the network I / F 7 while using the RAM 705 as a storage element for storing the operation result.
Analyze the value obtained from 01. And the operation panel 721
When it is analyzed that the packet is a data packet from to the car navigation system 722, the timer 707 is stopped, and the character data "Transfer detection from address 1 to address 2 is completed" is displayed on the LED together with the status of the selection register 706. Part 703
To the D / A converter 713.

The comparator 708 outputs a value of “0” to the system bus when the value of the timer 707 matches the value of the register D of the selection register 706, and outputs “1” when the value does not match. I do. If they match, the timer 707 is stopped. When the value of the comparator 708 is determined to be “0”, the CPU 702 also determines the state of the register of the selection register 706,
Character data “Transfer not detected from address 1 to address 2” is output to the LED display unit 703 and the D / A converter 713.

The LED display unit 703 reads “completion of transfer detection from address 1 to address 2” based on the data of the CPU 702,
Or "Transfer not detected from address 1 to address 2"
Is displayed by lighting the LED.

The D / A converter 713 sends the character data "transfer detection from address 1 to address 2 is completed" or "transfer not detected from address 1 to address 2" to IrDA which is a protocol for infrared communication. Then, the digital data is converted into an analog signal and passed to the LED 712. The LED 712 converts an analog signal into infrared light and transmits the infrared signal to the personal computer 714. The personal computer 714 receives the signal of the LED 712 according to the IrDA protocol, and converts the data back to the original character data.
Display the characters on the monitor on the personal computer.

As described above, according to the fourth embodiment of the present invention, a packet flowing on a network is captured, and if a packet does not flow on the network after a lapse of a specified time, a network abnormality is monitored by a monitor. It can be easily confirmed. Also, the network monitoring device can be controlled by a device belonging to an independent external network from the network to which the network monitoring device belongs, and the status of the network can be controlled to the outside by optical communication. I can let you know. And even when the communication means is light, there is no need to prepare an optical module as a communication device, and there is no need for wiring,
The substrate mounting surface can be reduced in size. In addition, since the transmission / reception method complies with the IrDA standard, highly reliable communication can be performed.

(Fifth Embodiment) In a fifth embodiment of the present invention, a network monitoring device for monitoring an in-vehicle information LAN to which an operation panel, a car navigation system, and a monitor are connected flows on a network. When a packet is captured and the packet does not flow through the network even after a lapse of a specified time, a network abnormality is displayed, and the network monitoring device is wirelessly transmitted from a personal computer belonging to an external network independent of the network. It can be controlled by radio waves.

FIG. 8 shows a basic configuration of a network monitoring apparatus according to a fifth embodiment of the present invention.

This network monitoring device is a
809. The sequencer 809 is connected to the in-vehicle information LAN to be monitored. In-vehicle information LAN
Is an Ethernet, for example, to which an operation panel 821, a car navigation system 822, and a monitor 823 are connected. The sequencer 809 is configured to be able to perform data communication by radio waves with a personal computer 814 connected to a LAN different from the in-vehicle information LAN.

The sequencer 809 has a system bus. The system bus has a function corresponding to two layers from the OSI reference model 1, and has a network I / F 801 for transmitting and receiving data packets to and from the onboard information LAN, a system bus for controlling the system, and data received by the network I / F 801. CPU 802 for analyzing packets and 640 × 480 L
An LED display section 803 having an ED for displaying characters, and a CP
A ROM 804 in which a program indicating a control procedure of the U802 is stored in advance, a RAM 805 as a data storage element for storing a calculation result of the CPU 802, and a selection for holding information of a station which a network monitor wants to monitor and a monitoring time. A register 806 and a timer for starting and stopping measuring time according to commands from the CPU 802 and a comparator 808 described below.
807, a comparator 808 configured by an exclusive OR for comparing the values of the register 806 and the timer 807, and an A / D converter 811
, A D / A converter 813 and an oscillator 815 are connected. The A / D converter 811 is connected to a copper antenna 810, the D / A converter 813 is connected to a copper antenna 812, and the oscillator 815 is connected to a piezoelectric ceramic speaker 816.

The register 806 sets a monitoring time, a register A holding the address of the device on the data packet transmitting side, a register B holding the address of the device on the data packet receiving side, and starts monitoring. It has a register C for holding a stop instruction and a register D for which a monitoring time can be set in units of 1 ms.

The copper antenna 810 receives the radio wave transmitted by the personal computer 814 and outputs it to the A / D converter 811. A / D
The converter 811 amplifies the input signal and converts it into a digital signal. The D / A converter 813 converts the digital data output by the CPU 802 into an analog signal and outputs the analog signal to the copper antenna 812. The copper antenna 812 converts an input signal into a radio wave and transmits the radio wave to the personal computer 814.

The oscillator 815 is supplied with 2-bit data from the CPU 802. When the data is "00", it is set to 0H.
When the data is "01", a voltage of 100 Hz and 1V is output, and when the data is "10", a voltage of 1 KHz and 1V is output. The piezoelectric ceramic speaker 816 converts the output of the oscillator 815 into sound.

Network I / F 801, CPU 802, LE
D display unit 803, ROM 804, RAM 805, selection register 80
6, timer 807, comparator 808, copper antenna 810, A / D converter 811, copper antenna 812, D / A converter 813, oscillator 8
15, and the piezoceramic speaker 816 are integrated on one large silicon substrate, and constitute a sequencer 809 for controlling the entire network monitoring apparatus. And the control method of the network monitoring device includes:
This is realized by a program stored in the ROM 804.

The network I / F 801 and the CPU 80
2. LED display section 803, ROM 804, RAM 805, selection register 806, timer 807, comparator 808, A / D converter 811, D
Since the / A converter 813 and the oscillator 815 are connected to a system bus monitored by the CPU 802, the blocks can share data with each other.

Operation panel 82 connected to in-vehicle information LAN
Reference numeral 1 denotes an operation panel for the user to control the device, and the address is “1”. The address of the car navigation system 822 connected to the in-vehicle information LAN is “2” and the monitor 823
Is "3".

Sequencer 809, operation panel 821, car navigation
The in-vehicle information LAN system is formed by the 822 and the monitor 823.

The personal computer 814 is used by a network monitor to control the network control device, and is a personal computer connected to a LAN independent of the onboard information LAN. The personal computer 814 is provided with a data transmission / reception function using start-stop synchronous communication with low-power wireless communication.

The signal flow of the network monitoring device configured as described above will be described. Here, the operation panel 82
It is assumed that whether or not one map enlargement instruction data packet is transmitted from 1 to the car navigation 822 is monitored.

As shown in FIG. 8, since the network is of the bus type, data packets are transmitted to all devices connected to the network. If the network monitor wants to monitor the network, the address of the device on the data packet transmitting side, the address of the device on the data packet receiving side, the monitoring time, and the start of monitoring are transmitted to the copper antenna 810 by low-power radio using the personal computer 814. Issue an instruction. In the present embodiment, the network monitor is
The address on the data packet transmitting side is “1”, the address on the data packet receiving side is “2”, and the monitoring time is 100 ms.
And set the monitoring start instruction from the personal computer 814 to the sequencer 8.
Issued for 09.

A copper antenna 810 receives a radio wave from a personal computer 814, converts the radio wave into an analog signal, and converts the analog signal into an A / D converter.
Send data to 811. The A / D converter 811 converts an analog signal into a digital signal and sends the digital signal to the CPU 802.

When the CPU 802 determines that the digital signal is the address of the device on the data packet transmitting side, it causes the register A of the selection register 806 to hold the data. CPU802
Causes the register B of the selection register 806 to hold the data when it determines that the digital signal is the address of the device on the data packet receiving side. When the CPU 802 determines that the digital signal is the monitoring start command,
To hold the data. When the CPU 802 determines that the digital signal is the monitoring time, the CPU 802 sets the register D
To hold the data.

When the register C of the selection register 806 is set to “monitoring stopped”, the network I / Fs 801 and C
The PU 802 has stopped the network monitoring process.
When the register C of the selection register 806 is set to “monitoring start”, the network I / F 801 and the CPU 802 execute a network monitoring process.

When the register C of the selection register 806 is set to "monitoring start", the CPU 802 instructs the timer 807 to start measuring time.

The network I / F 801 outputs a value of “1” to the system bus when capturing a data packet flowing through the network (vehicle information LAN),
The captured data packet is converted into a data packet that can be decoded by the CPU 802, and the value is passed to the CPU 802. C
When the PU 802 completes the data packet acquisition, the network I / F 801 outputs a value “0” to the system bus.

The CPU 802 operates according to the program stored in the ROM 804, and uses the network I / F 8 while using the RAM 805 as a storage element for storing the operation result.
Analyze the value obtained from 01. And operation panel 821
When it is analyzed that the packet is a data packet from the car to the car navigation system 822, the timer 807 is stopped, and the character data "Transfer detection from address 1 to address 2 is completed" is displayed on the LED together with the state of the selection register 806. Part 803
And outputs it to the D / A converter 813, and outputs data “10” to the oscillator 815.

The comparator 808 outputs a value of “0” to the system bus when the value of the timer 807 matches the value of the register D of the selection register 806, and outputs “1” when the value does not match. I do. If they match, the timer 807 is stopped.

When the CPU 802 determines that the value of the comparator 808 is “0”, the character data “Transfer from address 1 to address 2 is not detected” is displayed on the LED together with the state of the selection register 806. The signal is output to the section 803 and the D / A converter 813, and the data “01” is output to the oscillator 815.

The LED display unit 803 displays “Completion of transfer detection from address 1 to address 2” based on the data of the CPU 802,
Or "Transfer not detected from address 1 to address 2"
Is displayed by lighting the LED.

The D / A converter 813 converts the character data into a format for start-stop synchronous communication by low-power radio, converts the digital data into an analog signal, and transfers the analog signal to the copper antenna 812. The copper antenna 812 converts an analog signal into a low-power radio wave and transmits the radio wave to the personal computer 814. PC 8
14 receives the signal of the copper antenna 812 by low power radio,
It returns to the original character data from the asynchronous communication format and displays the characters on the monitor on the personal computer.

The oscillator 815 converts the data “01” into C
When received from the PU 802, a voltage of 100 Hz and 1 V is output to the piezoelectric ceramic speaker 816, and the piezoelectric ceramic speaker 816 outputs a sound of 100 Hz. Oscillator 8
15 outputs 1 KHz, 1V voltage to the piezoelectric ceramic speaker 816 when the data "10" is received from the CPU 802, and the piezoelectric ceramic speaker 816 outputs 1KH.
Outputs the sound of z.

As described above, according to the fifth embodiment of the present invention, a packet flowing on a network is captured, and if a packet does not flow on the network after a lapse of a specified time, a network abnormality is monitored by a monitor. It can be easily confirmed. Also, the network monitoring device can be controlled by a personal computer belonging to an external network independent of the network to which the network monitoring device belongs. Then, the state of the network can be notified to the outside by wireless communication, and even when the communication means is wireless, there is no need to prepare an antenna outside the apparatus as a communication device. Furthermore, even when the user is away from the network monitoring device, the analysis result can be known by voice or pitch without visually confirming the analysis result. Further, there is no need for wiring for an antenna or a speaker, and the board mounting surface can be reduced in size.

(Sixth Embodiment) In a sixth embodiment of the present invention, a network monitoring device for monitoring an in-vehicle information LAN to which an operation panel, a car navigation system, and a monitor are connected flows on a network. If the packet is captured and the packet does not flow through the network even after the lapse of the designated time, a network abnormality is displayed and the monitoring result of the network is stored in a removable PCMCIA card.

FIG. 9 shows a basic configuration of a network monitoring apparatus according to a sixth embodiment of the present invention.

This network monitoring device has a sequencer
909 and a monitor 903 connected to the sequencer 909. The sequencer 909 is connected to the in-vehicle information LAN to be monitored. The in-vehicle information LAN is, for example, Ethernet, and includes an operation panel 921 and a car navigation system 922.
And the monitor 923 are connected.

The sequencer 909 has a system bus. The system bus has a function equivalent to two layers from the OSI reference model 1, and has a network I / F 901 for transmitting / receiving data packets to / from the on-board information LAN, a system I / F for controlling the system, and data received by the network I / F 901. A CPU 902 for analyzing a packet, a ROM 904 in which a program indicating a control procedure of the CPU 902 is stored in advance,
R which is a data storage element for storing the operation result of PU902
AM905 and the stations that the network monitor wants to monitor,
Selection switch 906 for setting monitoring time, monitoring start and stop
A timer 907 which starts and stops measuring time in accordance with an instruction from the CPU 902 and a comparator 908 which will be described later, and a comparator 908 comprising an exclusive OR for comparing the values of the selection switch 906 and the timer 907. And a PCMCIA I / F for detachably mounting a PCMCIA card, connecting the card via a bidirectional bus, and interfacing with the PCMCIA card
910 is connected. A monitor 903 for displaying characters is connected to the CPU 902. Also, PCMC
The IA I / F 910 is connected to a memory card 911 having a large-capacity storage element.

The CPU 902 has a function of managing the date and time.

The selection switch 906 includes a switch A for setting the address of the device on the data packet transmitting side and a switch B for setting the address of the device on the data packet receiving side.
A switch C for inputting a monitoring start / stop command,
and a switch D capable of setting a monitoring time in s units.

The memory card 911 is a RAM composed of NVRAM, SRAM with backup battery, or the like.
This is a non-volatile RAM card that can store stored data even when power from a power supply is not supplied from outside.

Network I / F 901, CPU 902, RO
The M904, the RAM 905, the selection switch 906, the timer 907, the comparator 908, and the PCMCIA I / F 910 are integrated on one large silicon substrate, and constitute a sequencer 909 for controlling the entire network monitoring device. And the control method of the network monitoring device includes:
This is realized by a program stored in the ROM 904.

Further, the network I / F 901 and the CPU 90
2, ROM904, RAM905, selection switch 906, timer 90
7, the comparator 908 and the PCMCIA I / F 910
Since the PU902 is connected to the monitored system bus, the blocks can share data with each other.

Operation panel 92 connected to in-vehicle information LAN
Reference numeral 1 denotes an operation panel for the user to control the device, and the address is “1”. The address of the car navigation system 922 connected to the in-vehicle information LAN is “2”,
Is "3".

Sequencer 909, operation panel 921, car navigation
The 922 and the monitor 923 form an onboard information LAN system.

The signal flow in the network monitoring device configured as described above will be described. Here, a case where the operation panel 921 monitors whether or not one map enlargement instruction data packet has been transmitted to the car navigation system 922 will be described as an example.

Since the network is of the bus type as shown in FIG. 9, data packets are transmitted to all devices connected to the network. When the switch C of the selection switch 906 is set to “stop monitoring”, the network I / F 901 and the CPU 902 have stopped the network monitoring process. When the switch C of the selection switch 906 is set to “start monitoring”, the network I / F
The CPU 901 and the CPU 902 execute a network monitoring process.

The network monitor selects the selection switch 906
Switch A of the switch “1”, switch B of the selection switch 906
Is set to “2”, the switch D of the selection switch 906 is set to “monitoring cycle 100 ms”, and the switch C of the selection switch 906 is set.
To “Start monitoring”.

When the switch C of the selection switch 906 is set to "monitoring start", the CPU 902 instructs the timer 907 to start measuring time.

The network I / F 901 outputs a value of “1” to the system bus when capturing a data packet flowing in the network, and converts the captured data packet into a data packet that can be decoded by the CPU 902. The value is passed to the CPU 902. When the CPU 902 completes the data packet acquisition, the network I / F 901
The value "0" is output to the system bus.

The CPU 902 operates according to the program stored in the ROM 904, and uses the network I / F 9 while using the RAM 905 as a storage element for storing the operation result.
Analyze the value obtained from 01. And the operation panel 911
When it is analyzed that the packet is a data packet from to the car navigation system 912, the timer 907 is stopped, and the character data of "transfer detection from address 1 to address 2 is completed" is displayed on the monitor 903 together with the state of the selection switch 906. And PC
Output to MCIA I / F910. Also, the CPU 902
When outputting character data to PCMCIA I / F910,
Also outputs date and time data.

When the value of the timer 907 matches the value set in the switch D of the selection switch 906, the comparator 908 outputs a value of “0” to the system bus.
Outputs “1”. If they match, timer 90
Stop 7.

When the value of the comparator 908 is determined to be "0", the CPU 902 monitors the monitor 903 for character data "transfer not detected from address 1 to address 2" together with the state of the selection switch 906. To the PCMCIA I / F910. Also, the CPU 902 has a PCMCIA I / F 9
When character data is output to 10, the date and time data is also output.

The monitor 903 outputs the data
Characters such as “transfer detection from address 1 to address 2 is completed” or “transfer not detected from address 1 to address 2” is displayed on the screen.

When the memory card 911 is connected to the PCMCIA I / F 910, the transfer completion from the address 1 to the address 2 is completed or the transfer failure from the address 1 to the address 2 is not detected. Character data and date and time data are passed, and the memory card 911 holds those data.

The network monitor monitors the memory card 911
Can be removed from the network monitoring device and connected to a personal computer (not shown) equipped with a PCMCIA interface to analyze the monitoring data.

As described above, according to the sixth embodiment of the present invention, a packet flowing on a network is captured, and if a packet does not flow on the network even after a lapse of a specified time, a network abnormality is monitored by a monitor. It can be easily confirmed. Further, the result of monitoring the network can be taken out of the network monitoring device. Furthermore, a global standard mass storage device used in personal computers can be used as a storage device for storing monitoring results.

(Seventh Embodiment) In a seventh embodiment of the present invention, an operation panel, a car navigation system, a monitor, a C
In a network monitoring device for monitoring an in-vehicle information LAN connected to a D player, a spectrum analyzer for creating frequency distribution data of digital audio data reproduced from the CD player, a monitor capable of displaying a bar graph, and the spectrum analyzer And a selector for switching between the frequency distribution data from the PC and the packet type distribution data output by the device connected to the network and outputting the data to a monitor capable of displaying the bar graph.

FIG. 10 shows a basic configuration of a network monitoring apparatus according to a seventh embodiment of the present invention.

This network monitoring device is a sequencer
1009, and a monitor 1013 and a speaker 1017 connected to the sequencer 1009. PLC 10
09 is connected to the in-vehicle information LAN to be monitored.
The in-vehicle information LAN is, for example, an Ethernet, and is connected to an operation panel 1021, a car navigation system 1022, a monitor 1023, and a CD player 1024.

The sequencer 1009 has a system bus. The system bus has a function equivalent to two layers from the OSI reference model 1, and has a network I / F 1001 for transmitting and receiving data packets to and from the in-vehicle information LAN, a system bus for controlling the system, and data received by the network I / F 1001. A CPU 1002 for analyzing a packet, and a ROM 1004 in which a program indicating a control procedure of the CPU 1002 is stored in advance.
RAM 1005 which is a data storage element for storing the calculation result of CPU 1002, a station which the network monitor desires to monitor, a monitoring time, a selection switch 1006 for setting monitoring start and stop, and a CPU 1002 and a comparator 1008 which will be described later. Timer 1007 to start or stop measuring time with the instruction
And a comparator 1008 configured by an exclusive OR that compares the values of the selection switch 1006 and the timer 1007, a spectrum analyzer 1010 that performs frequency analysis from digital audio data, and a set of five counters.
Counter that can be reset and incremented by one from 1002
1011, a data generator 1015 for generating digital audio data from a reproduction signal of the CD player 1024, and a D / A converter 1016 for converting output digital audio data of the data generator 1015 into analog data for driving a speaker. Have been. A monitor 1013 is connected to the CPU 1002. The spectrum analyzer 1010 includes the output of the spectrum analyzer 1010 and the counter 1011.
A selector 1012 for switching the output of is connected. The D / A converter 1016 has a speaker 10 for outputting sound.
17 is connected.

The selection switch 1006 includes a switch A for setting the address of the device on the data packet transmitting side and a switch B for setting the address of the device on the data packet receiving side.
A switch C for inputting a monitoring start / stop command,
and a switch D capable of setting a monitoring time in s units.

The spectrum analyzer 1010 converts the digital audio data to 100 Hz, 1 KHz, 5 KH
z, 10 KHz, and 20 KHz signals are extracted, the amplitude value of each signal is converted to 4-bit data, and the data is passed to the selector 1012 with a 20-bit bus width.

The counter 1011 is composed of five 4-bit counters. The counter A indicates the number of packets transmitted by the first station, the counter B indicates the number of packets transmitted by the second station, and the counter C indicates the number of packets transmitted by the third station. The counter D counts up the number of packets transmitted by the fourth station, the counter E counts up the number of detection errors according to the instruction of the CPU 1002, and the result is counted by the selector 1012 with a 20-bit bus width. Pass the data to

The selector 1012 has a changeover switch S,
When the switch S is set to "1", the counter 1011 is output, and when the switch S is set to "0", the data of the spectrum analyzer 1010 is output.

The monitor 1013 is connected to the 20b from the selector 1012.
From the data bus of "it", decimal conversion is performed in 4-bit units from the lower 0th bit, and the converted values are displayed in a bar graph.

Network I / F 1001, CPU 1002, R
OM1004, RAM1005, selection switch 1006, timer 100
7, comparator 1008, spectrum analyzer 1010, counter 1011, data generator 1015, and D / A converter 1016
Are integrated on a single large silicon substrate, and constitute a sequencer 1009 for controlling the entire network monitoring apparatus. The method of controlling the network monitoring device is realized by a program stored in the ROM 1004.

The network I / F 1001 and the CPU 10
02, ROM1004, RAM1005, selection switch 1006, timer 1007, comparator 1008, and PCMCIA I / F1010
Are connected to the system bus monitored by the CPU 1002, so that the blocks can share data with each other.

Operation panel 10 connected to in-vehicle information LAN
Reference numeral 21 denotes an operation panel for the user to control the device, and the address is "1". The address of the car navigation system 1022 connected to the in-vehicle information LAN is "2"
The address of 23 is "3". The CD player 1024 generates digital audio data from a CD-ROM on which music is recorded, and has an address of “4”.

The sequencer 1009, the operation panel 1021, the car navigation system 1022, the monitor 1023, and the CD player 1024 form an onboard information LAN system.

The flow of signals in the network monitoring device configured as described above will be described. Here, an example is described in which the operation panel 1021 monitors whether one map enlargement instruction data packet has been transmitted to the car navigation system 1022.

As shown in FIG. 10, since the network is of the bus type, data packets are transmitted to all devices connected to the network. Select switch 1006
Is set to "monitoring start", the switch C
U1002 executes network monitoring processing. The network monitor puts the CD player 1024 in the reproducing state, and sets the switch S of the selector 1012 to “0”. The CD player 1024 divides digital audio data, converts the data into data packets that can be output to a network, and sends the data packets to the sequencer 1009 via the network.

When the network I / F 1001 captures a data packet flowing through the network, it outputs a value of “1” to the system bus, and converts the captured data packet into a data packet that the CPU 1002 can decode. The value is passed to the CPU 1002. When the CPU 1002 completes the data packet acquisition, the network I / F 1001
Outputs a value of "0" to the system bus.

When the CPU 1002 determines that the data received from the network I / F 1001 is data from the CD player 1024, the CPU 1002 transmits the data to the spectrum analyzer 1010.
The value is passed to 10 and the data generator 1015, and the value of the counter D of the counter 1011 is incremented by one.

The spectrum analyzer 1010 receiving the data from the CPU 1002 analyzes the frequency of the data and passes the result to the selector 1012. The data generator 1015 having received the data from the CPU 1002 converts the packet-divided digital audio data into the original digital audio data, and passes the data to the D / A converter 1016.

[0204] The D / A converter 1016 converts the digital audio data into analog audio data and transfers the analog audio data to the speaker 1017. The speaker 1017 emits a sound according to the output signal of the D / A converter 1016.

The selector 1012 passes the data of the spectrum analyzer 1010 to the monitor 1013 because the switch S is set to “0”, and the monitor 1013 keeps updating the bar graph based on the data of the spectrum analyzer 1010.

Next, the network monitor sets the switch A of the selection switch 1006 to “1”, the switch B of the selection switch 1006 to “2”, and the switch D of the selection switch 1006 to “monitoring cycle 100 ms”. The switch C of the switch 1006 is set to “monitoring start”, and the switch S of the selector 1012 is set to “1”.

When the switch C of the selection switch 1006 is set to "monitoring start", the CPU 1002 instructs the timer 1007 to start measuring time, and presets the counter E of the counter 1011 to "1111".

The network I / F 1001 outputs a value of “1” to the system bus when capturing a data packet flowing through the network, and converts the captured data packet into a data packet that can be decoded by the CPU 1002. The value is passed to the CPU 1002. When the CPU 1002 completes the data packet acquisition, the network I / F 1001
Outputs a value of "0" to the system bus.

The CPU 1002 operates according to the program stored in the ROM 1004, and uses the network I / O while using the RAM 1005 as a storage element for storing the operation result.
Enter the value obtained from F1001 from the operation panel 1021 to the car navigation system 10.
When it is analyzed that the packet is a data packet to 22, the timer 1007 is stopped and the counter E of the counter 1011 is set to “00”.
00 ”.

When the value of the timer 1007 matches the value set in the switch D of the selection switch 1006, the comparator 1008 outputs a value of “0” to the system bus. 1 "is output.

When the value of the comparator 1008 is determined to be "0", the CPU 1002 resets the timer 1007, continues the time measurement, and counts up the counter E by one.

When the count value of the counter E reaches "1110", the count value of the counter E keeps "1110" even if it receives a count-up instruction from the CPU 1002.

The selector 1012 monitors the data of the counter 1011 because the switch S is set to “1”.
The monitor 1013 keeps updating the bar graph based on the data of the counter 1011.

As described above, according to the seventh embodiment of the present invention, there is no need to prepare a display device for capturing packets flowing on the network and newly displaying network analysis results. Can visually determine the state of the network.

Note that, in the seventh embodiment, the CD
The digital audio data signal reproduced by the player is sent to the data generator, where the digital audio data is generated, and the spectrum analyzer performs the frequency analysis of the digital audio data. The digital video data may be sent to a data generator, where digital audio data is generated, and a spectrum analyzer may be configured to perform a frequency analysis of the digital audio data.

(Eighth Embodiment) In an eighth embodiment of the present invention, a network monitoring apparatus for monitoring an in-vehicle information LAN to which an operation panel, a car navigation system, and a monitor are connected, detects a network abnormality. This makes it possible to display and display the network monitoring result to the outside, and to prevent a device connected to the network system from being controlled from outside without permission.

FIG. 11 shows a basic configuration of a network monitoring apparatus according to the eighth embodiment of the present invention.

This network monitoring device is composed of a sequencer
1109 and a monitor 1103 connected to the sequencer 1109. The sequencer 1109 is connected to the in-vehicle information LAN to be monitored. The in-vehicle information LAN uses, for example, Ethernet, and has an operation panel 11.
21, the car navigation system 1122, and the monitor 1123 are connected.

The sequencer 1109 has a system bus. The system bus has a function equivalent to two layers from the OSI reference model 1, and has a network I / F 1101 for transmitting / receiving data packets to / from the on-board information LAN, a system I / F for controlling the system, and data received by the network I / F 1101. A CPU 1102 for analyzing a packet, and a ROM 1104 in which a program indicating a control procedure of the CPU 1102 is stored in advance.
A RAM 1105 which is a data storage element for storing the operation result of the CPU 1102, a station which the network monitor wants to monitor, a monitoring time, a selection switch 1106 for setting monitoring start and stop, and a CPU 1102, a comparator 1108 which will be described later. Timer 1107 to start or stop measuring time by the instruction of
And a comparator 1108 composed of exclusive OR for comparing the values of the selection switch 1106 and the timer 1107, and a PCMCIA card which is detachably mounted and connected to the same via a bidirectional bus. PCMCI for interface
AI / F 1110 and a table ROM 11 that records an instruction set referred to by a processing unit of a control device (such as a personal computer) belonging to an external network independent of the in-vehicle information LAN.
12 and a function equivalent to two layers from the OSI reference model 1.
A network I / F 1113 for transmitting and receiving data packets to and from the external network is connected. And C
A monitor 1103 for displaying characters is connected to the PU 1102. The PCMCIA I / F 1110 is connected to a memory card 1111 having a large-capacity storage element. The external network connected to the network I / F 1113 uses, for example, Ethernet.

The CPU 1102 has a function of managing date and time.

A selection switch 1106 includes a switch A for setting an address of a device on the data packet transmitting side, a switch B for setting an address on the data packet receiving side, a switch C for inputting a monitoring start / stop command, and a 1 ms unit. And a switch D capable of setting a monitoring time.

[0222] The memory card 1111 is a RAM composed of NVRAM, SRAM with backup battery, or the like.
This is a non-volatile RAM card that can store stored data even when power from a power supply is not supplied from outside.

The table ROM 1112 stores control commands for the car navigation system 1122. Here, it is assumed that an enlargement command command is stored.

Network I / F 1101, CPU 1102, R
OM1104, RAM1105, selection switch 1106, timer 110
7. The comparator 1108, the PCMCIA I / F 1110, the table ROM 1112, and the network I / F 1113 are integrated on one large silicon substrate, and constitute a sequencer 1109 for controlling the entire network monitoring apparatus from these components. And the control method of the network monitoring device includes:
This is realized by a program stored in the ROM 1104.

Also, the network I / F 1101, the CPU 11
02, ROM 1104, RAM 1105, selection switch 1106, timer 1107, comparator 1108, PCMCIA I / F 1110, table ROM 1112, and network I / F 1113
Since the PU 1102 is connected to the monitored system bus, the blocks can share data with each other.

Operation Panel 11 Connected to In-Vehicle Information LAN
Reference numeral 21 denotes an operation panel for the user to control the device. The address is “12.” The address of the car navigation system 1122 connected to the in-vehicle information LAN is “2” and the monitor 11
The address of 23 is "3".

The sequencer 1109, the operation panel 1121, the car navigation system 1122, and the monitor 1123 form an on-board information LAN system. The network monitoring device uses the onboard information L
The in-vehicle information LAN system inserted between the AN and the external network, via the network monitoring device,
It can send and receive data packets to and from external networks.

The flow of signals in the network monitoring device configured as described above will be described. Here, it is monitored whether the operation panel 1121 has transmitted one map enlargement instruction data packet to the car navigation system 1122, and one map enlargement instruction data packet has been transmitted from the external network to the car navigation system 1122. Let's take an example.

Since the network is of the bus type as shown in FIG. 11, data packets are transmitted to all the devices connected to the network. Select switch 1106
When the switch C is set to “stop monitoring”, the network I / F 1101 and the CPU 1102 have stopped the network monitoring process. Switch C of selection switch 1106
Is set to "monitoring start", the network I /
F1101 and the CPU 1102 execute network monitoring processing.

The network monitor selects the selection switch 1106
Switch C of the selection switch 1106 to “1”, switch B of the selection switch 1106 to “2”, and switch D of the selection switch 1106 to “monitoring period 1”.
00 ms ”, and the switch C of the selection switch 1106 is set to“ start monitoring ”.

When the switch C of the selection switch 1106 is set to “start monitoring”, the CPU 1102 instructs the timer 1107 to start measuring time.

When a data packet flowing through the network is captured, the network I / F 1101 outputs a value of “1” to the system bus, and converts the captured data packet into a data packet that can be decoded by the CPU 1102, The value is passed to the CPU 1102. When the CPU 1102 completes the data packet acquisition, the network I / F 1101
Outputs a value of "0" to the system bus.

The CPU 1102 operates according to the program stored in the ROM 1104, and uses the network I / O while using the RAM 1105 as a storage element for storing the operation result.
Enter the value obtained from F1101 from the operation panel 1111 to the car navigation system 11
When it is analyzed that the packet is a data packet to the address 12, the timer 1107 is stopped, and the character data “Transfer detection from address 1 to address 2 is completed” is also sent to the monitor 1103 and the PCMCIA together with the state of the selection switch 1106. I
/ F1110. The CPU 1102 is a PCMCI
When character data is output to the A I / F 1110, date and time data is also output.

When the value of the timer 1107 matches the value set in the switch D of the selection switch 1106,
The value "0" is output to the system bus, and "1" is output if they do not match. If they match, the timer 1107 is stopped.

When the value of the comparator 1108 is determined to be "0", the CPU 1102 monitors the character data "transfer not detected from address 1 to address 2" along with the state of the selection switch 1106, and monitors 1103. And PCMCIA I / F11
Output to 10. The CPU 1102 is a PCMCIA I
When the character data is output to / F1110, the date and time data is also output.

The monitor 1103 uses the data of the CPU 1102
Characters such as “transfer detection from address 1 to address 2 is completed” or “transfer not detected from address 1 to address 2” is displayed on the screen.

When the memory card 1111 is connected, the PCMCIA I / F 1110 transmits “completion of transfer detection from address 1 to address 2” to the memory card 1111 or
The character data of "transfer not detected from address 1 to address 2" and the date and time data are passed, and the memory card 1111 holds those data.

When the vehicle-mounted information LAN system is accessed from the external network, the network I / F 1113
Indicates “1” on the system bus when capturing a data packet.
Is converted to a data packet that can be decoded by the CPU 1102, and the value is passed to the CPU 1102. When the CPU 1102 completes data packet acquisition, the network I / F
Reference numeral 1113 outputs a value of "0" to the system bus.

The CPU 1102 operates according to the program stored in the ROM 1104, and uses the network I / O while using the RAM 1105 as a storage element for storing the operation result.
The value obtained from F1113 is compared with the control command stored in the table ROM 1112.

As a result of the comparison, if they do not match, the data packet is passed to the network I / F 1101,
The IA I / F 1110 records date and time data and data packets acquired from the network I / F 1113 as access data from the external network. Network I / F
1101 converts the obtained data packet into a data packet that can be transferred to a network, and sends the data packet to the in-vehicle information LAN system.

As a result of comparison, if they match, the PCM
The date and time data and the data packet are recorded in the CIA I / F 1110 as access data from the external network, and are deleted without passing the data packet to the network I / F 1101.

The network monitor checks the memory card 1111
Can be removed from the network monitoring device and connected to a personal computer (not shown) equipped with a PCMCIA interface to analyze the monitoring data.

Next, a detailed control procedure of the network monitoring apparatus in FIG. 11 will be described with reference to FIG.

First, the CPU 1102 determines whether or not the switch C of the selection switch 1106 is set to “monitoring started” (step S1201).

When the switch C of the selection switch 1106 is set to "monitoring start", the timer 1107 is instructed to start measuring time (step S1202), and the network I / F 1101 receives the data packet. It is determined whether or not it has been performed (step S1203).

When the CPU 1102 obtains a value “1” from the network I / F 1101, (YES in step S1203)
ES) The CPU 1102 determines that the data packet has been received, acquires the data packet from the network I / F 1101 (step S1204), extracts the sender address from the acquired data packet (step S1205), and It is determined whether the address set in the switch A matches (step S1206).

If the address on the transmission side matches the address set in switch A (Y in step S1206)
ES), the receiving address is extracted from the acquired data packet (step S1207), and it is determined whether the receiving address matches the address set in the switch B (step S1208).

If the address on the receiving side matches the address set in switch B (Y in step S1208)
ES), and outputs to the monitor 1103 character data "Completion of transfer detection from address 1 to address 2" (step S120).
9), the process proceeds to step S1201.

When the CPU 1102 acquires a value “0” from the network I / F 1101 (N in step S1203)
O), It is determined whether the value of the timer 1107 matches the value set in the switch D of the selection switch 1106 (S1216). If the value of the timer 1107 does not match the value of the switch D of the selection switch 1106, the process moves to step S1203. When the value of the timer 1107 matches the value set in the switch D of the selection switch 1106, the character data "Transfer not detected from address 1 to address 2" is output to the monitor 1103 (S1217). , Step S12
Transition to 01.

If the transmission side address does not match the address set in the switch A, the process proceeds to step S1203.
Move to. If the receiving address does not match the address set in the switch B, the process moves to step S1203.

When the switch C of the selection switch 1106 is not set to “monitoring start”, the network I / F 11
13 determines whether a data packet has been received (step S1210).

When the CPU 1102 acquires a value “0” from the network I / F 1113 (N in step S1210)
O) The process moves to step S1201. If the CPU 1102 obtains a value “1” from the network I / F 1113 (YES in step S1210), the CPU 1102 determines that a data packet has been received, and obtains the data packet from the network I / F 1113 (step S1210). (S1211), the obtained data packet is compared with the data stored in the table ROM 1112 (step S1212), and it is determined whether or not the control command in the data packet matches the data in the table ROM (step S1213). .

If the control command in the data packet does not match the data in the table ROM (step
(NO in S1212), the data packet is transmitted to the network I / F 1101.
(Step S1215), and outputs the date and time data and the data packet to the PCMCIA I / F 1110 (step S121).
4), proceed to step S1201.

When the control command in the data packet matches the data in the table ROM (step S1)
212: YES), date and time data and data packet
The data is output to the AI / F 1110 (S1214), and the flow shifts to step S1201.

As a result, external vehicle information LA
A data packet for controlling a device connected to the N system is deleted.

As described above, according to the eighth embodiment of the present invention, a packet flowing on a network is captured, and if a packet does not flow on the network even after a lapse of a specified time, a network abnormality is monitored by a monitor. It can be easily confirmed. In addition, the monitoring result of the network can be taken out of the network monitoring device, and a world-standard large-capacity storage device used in a personal computer as a storage device for storing the monitoring result can be used. Further, it is possible to prevent devices connected to the network system from being controlled without permission from an external network. Then, the network monitor can know that the network system has been accessed without permission from the external network by analyzing the recorded communication data.

[0257]

As described above, according to the present invention, there is provided a network monitoring apparatus for monitoring packets of a network system for performing data communication by wire communication or wireless communication between devices using a packet communication method. Receiving means for receiving, and a holding means for holding a monitoring start command and monitoring time input from the outside,
Counting means for counting the time from the start of packet monitoring in response to the input of the monitoring start command; and comparing the value of the counting means with the monitoring time held by the holding means and detecting that they match. Means for analyzing a packet received by the receiving means, and determining whether or not a packet has been received from when the packet monitoring is started until a match is detected by the comparing means; and Display means for displaying the determination result of the means, so that packets flowing on the network can be caught, and if a packet does not flow through the network even after a specified time has elapsed, an effect of indicating a network abnormality can be exhibited. can get.

A receiving means for receiving a packet flowing on the network, a holding means for holding a monitoring start command and a monitoring packet amount input from outside, and a means for starting packet monitoring by inputting the monitoring start command. A counting unit that counts the amount of packets received by the receiving unit; a comparing unit that compares a value of the counting unit with a value of the monitoring packet amount held by the holding unit and detects that they match, Calculating means for analyzing the packets received by the receiving means and determining, based on the output of the comparing means, whether or not a packet of the monitoring packet amount has been received, and a display for displaying the result of the determination by the calculating means Means, it can be shown that all packets of the monitoring packet amount input from the outside have flowed through the network. Cormorants effect can be obtained.

Further, receiving means for receiving a packet flowing on the network, holding means for holding a monitoring start command and a maximum value and a minimum value of a monitoring packet cycle inputted from outside, and input of the monitoring start command, A measuring unit that measures a cycle of a packet received by the receiving unit, and compares a measured value of the measuring unit with a maximum value and a minimum value held by the holding unit, and the measured value is a minimum value from the maximum value. Comparing means for detecting whether or not the received value is out of the range, and analyzing the packet received by the receiving means, and the cycle of the received packet based on the output of the comparing means is the maximum value. And a display means for displaying the result of the determination by the calculation means, so that the station satisfies the packet cycle standard. Effect is obtained that packets of abnormal periods have may indicate that output to the network.

Since the wireless communication device is provided with wireless two-way communication means, the network control device can be controlled by a device belonging to an independent external network from the network to which the network control device belongs. The effect is obtained.

[0261] Further, as the wireless two-way communication, a weak radio wave transmission / reception means is used as the wireless two-way communication means, and data recording the state of the network is transmitted to the outside by the transmission / reception means. Can be notified to the outside by the weak radio communication.

Further, since the metal wiring having the function of the antenna is formed on the same substrate together with all the means of the network monitoring device, the antenna can be used as a communication device even if the communication means is wireless. In addition, there is no need to prepare the wiring, no wiring is required, the number of components can be reduced, and the size of the board mounting surface can be reduced.

Furthermore, since optical communication is used as wireless two-way communication and data recording the state of the network is transmitted to the outside by the transmitting / receiving means, the state of the network can be notified to the outside by optical communication. Is obtained.

Also, a photo-receiving device for optical communication is used.
Since the diode and the LED or laser diode, which is a transmitting element for optical communication, are formed on the same substrate together with all the means of the network monitoring device, even if the communication means is light, it can be used as a communication device. There is no need to prepare an optical module, no wiring is required, and the size of the substrate mounting surface can be reduced.

Further, since the transmission / reception system conforms to the IrDA standard, an effect that highly reliable communication can be performed is obtained.

[0266] Since the apparatus is provided with an interface means for connecting a detachable auxiliary storage electronic device and exchanging various data, it is possible to take out the result of monitoring the network outside the network monitoring device. The effect is obtained.

Furthermore, if the interface means is PCMC
Since it complies with the IA standard, an effect is obtained that a global standard mass storage device used in personal computers can be used as a storage device for storing monitoring results.

Further, since sound source means for indicating a station on the network where a failure such as a failure has occurred by voice is formed on the same substrate, the analysis result is not visually checked even when the user is away from the network monitoring device. In addition, it is possible to confirm the result only by voice, and it is possible to obtain an effect that no wiring is required and the substrate mounting surface can be reduced in size.

Furthermore, since the sound generated by the sound source means is provided on the same substrate with means for changing the pitch according to the station in which the fault has occurred, the analysis result can be visually checked even when the user is away from the network monitoring device. Thus, it is possible to obtain the effect that the analysis result can be known from the voice or the pitch without checking.

Further, since the display means for displaying the monitoring result in a diagram is provided, an effect is obtained that the network monitor can visually judge the state of the network.

Then, audio data reproducing means, frequency analyzing means for creating frequency distribution data of the audio signal from the audio data reproducing means, graph display means capable of displaying a graph, and frequency distribution from the frequency analyzing means Switching means for switching data and packet type distribution data output by each station connected to the network and outputting the data to the graph display means, eliminating the need to prepare a new display device for displaying a network analysis result. In addition, there is an effect that the network monitor can visually determine the state of the network.

[0272] Also, since there are provided video data reproducing means including audio data and frequency analyzing means for generating frequency distribution data of audio data from the video data reproducing means, a new display device for displaying a network analysis result is prepared. There is no need to perform this operation, and the network monitor can visually determine the state of the network.

Means for connecting to an external network independent of the network to which said network monitoring device belongs; instruction table means for recording an instruction set referred to by a processing unit of a control device belonging to said external network; Determining means for determining from the data packet from the external network that the instruction set in the instruction table means is included; and determining that the data packet includes the instruction set in the instruction table means by the determining means. In such a case, since there is provided an erasing means for erasing the data packet, it is possible to prevent an apparatus connected to the network to which the network monitoring apparatus belongs from being controlled from an external network without permission.

Further, since the communication system is provided with communication data storage means for storing communication data from the external network in order for the network monitor to check the number of times of access from the external network to the network, access from the external network to the network system without permission is provided. This has the effect that the network monitor can know that by analyzing the recorded communication data.

[Brief description of figures]

FIG. 1 is a block diagram of a network monitoring device according to a first embodiment of the present invention.

FIG. 2 is an operation flowchart of the network monitoring device according to the first embodiment of this invention;

FIG. 3 is a block diagram of a network monitoring device according to a second embodiment of the present invention;

FIG. 4 is an operation flowchart of the network monitoring device according to the second embodiment of this invention;

FIG. 5 is a block diagram of a network monitoring device according to a third embodiment of the present invention.

FIG. 6 is an operation flowchart of a network monitoring device according to a third embodiment of the present invention.

FIG. 7 is a block diagram of a network monitoring device according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram of a network monitoring device according to a fifth embodiment of the present invention.

FIG. 9 is a block diagram of a network monitoring device according to a sixth embodiment of the present invention.

FIG. 10 is a block diagram of a network monitoring device according to a seventh embodiment of the present invention.

FIG. 11 is a block diagram of a network monitoring device according to an eighth embodiment of the present invention.

FIG. 12 is an operation flowchart of a network monitoring device according to an eighth embodiment of the present invention.

[Explanation of symbols]

101, 301, 501, 701, 901, 1001, 1101, 1113 Network I / F 102, 302, 502, 702, 902, 1002, 1102 CPU 103, 113, 303, 313, 503, 513, 723, 903, 923 , 101
3, 1023, 1103, 1123 Monitor 104, 304, 504, 704, 904, 1004, 1104 ROM 105, 305, 505, 705, 905, 1005, 1105 RAM 106, 306, 506, 906, 1006, 1106 Selection switch 107 , 507, 707, 907, 1007, 1107 Timer 108, 308, 508, 708, 908, 1008, 1108 Comparator 109, 309, 509, 709, 909, 1009, 1109 Sequencer 111, 311, 511, 721, 921, 1021, 1121 Operation panel 112, 312, 512, 722, 922, 1022, 1122 Car navigation system 307, 1011 Counter 703 LED display unit 706 Selection register 710 Photodiode 712 LED 714 Personal computer 910, 1100 PCMCIA I / F 911, 1111 Memory card 1010 Spectrum analyzer 1012 Selector 1017 Speaker 1024 CD player 1112 Table ROM

[Procedure amendment]

[Submission date] November 10, 1999 (1999.11.
10)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a block diagram of a network monitoring device according to a first embodiment of the present invention;

FIG. 2 is an operation flowchart of the network monitoring device according to the first embodiment of the present invention;

FIG. 3 is a block diagram of a network monitoring device according to a second embodiment of the present invention;

FIG. 4 is an operation flowchart of a network monitoring device according to a second embodiment of the present invention;

FIG. 5 is a block diagram of a network monitoring device according to a third embodiment of the present invention;

FIG. 6 is an operation flowchart of a network monitoring device according to a third embodiment of the present invention;

FIG. 7 is a block diagram of a network monitoring device according to a fourth embodiment of the present invention;

FIG. 8 is a block diagram of a network monitoring device according to a fifth embodiment of the present invention;

FIG. 9 is a block diagram of a network monitoring device according to a sixth embodiment of the present invention;

FIG. 10 is a block diagram of a network monitoring device according to a seventh embodiment of the present invention;

FIG. 11 is a block diagram of a network monitoring device according to an eighth embodiment of the present invention;

FIG. 12 is an operation flowchart of a network monitoring device according to an eighth embodiment of the present invention;

FIG. 13 is a diagram showing a conventional communication monitoring device.

[Description of Code] 101, 301, 501, 701, 901, 1001, 1101, 1113 Network I / F 102, 302, 502, 702, 902, 1002, 1102 CPU 103, 113, 303, 313, 503, 513, 513, 723, 903, 923, 101
3, 1023, 1103, 1123 Monitor 104, 304, 504, 704, 904, 1004, 1104 ROM 105, 305, 505, 705, 905, 1005, 1105 RAM 106, 306, 506, 906, 1006, 1106 Selection switch 107 , 507, 707, 907, 1007, 1107 Timer 108, 308, 508, 708, 908, 1008, 1108 Comparator 109, 309, 509, 709, 909, 1009, 1109 Sequencer 111, 311, 511, 721, 921, 1021, 1121 Operation panel 112, 312, 512, 722, 922, 1022, 1122 Car navigation system 307, 1011 Counter 703 LED display section 706 Selection register 710 Photodiode 712 LED 714 Personal computer 910, 1100 PCMCIA I / F 911, 1111 Memory card 1010 Spectrum Analyzer 1012 Selector 1017 Speaker 1024 CD player 1112 Table ROM

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K032 AA06 BA06 BA08 CC13 CD01 DA01 DA21 DB19 DB28 EA04 EA06 EA07 EC03 5K033 AA06 BA06 BA08 CB15 CC01 DA01 DA13 DA17 DB12 DB20 EA04 EA06 EA07 EC03

Claims (24)

[Claims] 1. A network monitoring apparatus for monitoring a packet of a network system for performing data communication between a plurality of devices using a wired or wireless packet communication method, comprising: a receiving unit for receiving a packet flowing on a network; Holding means for holding a monitoring start command and a monitoring time input from a counter, counting means for counting the time since packet monitoring was started by input of the monitoring start command, and a value of the counting means and the holding means. A comparing unit that compares the held monitoring time and detects that the packet has been matched, analyzes the packet received by the receiving unit, and detects that the packet has been matched by the comparing unit after starting packet monitoring. Calculating means for determining whether or not a packet has been received up to a predetermined time, and displaying a determination result of the calculating means. A network monitoring device comprising: a display unit. 2. A network monitoring method in which a programmed computer executes packet monitoring of a network system for performing data communication according to a packet communication method using a wired or wireless method between a plurality of devices, wherein a packet flowing on a network is received. Receiving procedure, a holding procedure for holding a monitoring start command and a monitoring time input from outside, a counting procedure for counting a time from starting packet monitoring by inputting the monitoring start command, and a counting procedure for: Comparing the count value with the monitoring time indicated in the holding procedure and detecting a match; and analyzing the packet received in the receiving procedure and starting the packet monitoring and then comparing the comparing procedure. To determine whether a packet has been received until a match is detected Calculation procedures and a network monitoring method is characterized in that a display procedure for displaying the discrimination result of the calculation procedure. 3. A computer readable recording network monitoring control program for executing, by a programmed computer, a packet of a network system for performing data communication by a packet communication method between a plurality of devices using a wired or wireless communication. In the recording medium, a receiving procedure for receiving a packet flowing on the network, a holding procedure for holding a monitoring start command and a monitoring time input from the outside, and a time from when packet monitoring is started by inputting the monitoring command. A counting procedure for counting, comparing the count value of the counting procedure and the monitoring time indicated in the holding procedure, a comparing procedure for detecting that they match, and analyzing the packet received in the receiving procedure, Since the packet monitoring was started, a match was found in the comparison procedure. A computation procedure for determining the presence or absence of the reception of the packet until it is known, a recording medium, characterized by a display procedure for displaying the discrimination result of the calculation procedure to record the network monitoring control program for causing the computer to execute. 4. A network monitoring device for monitoring a packet of a network system for performing data communication by a packet communication method using a wired or wireless method between a plurality of devices, comprising: a receiving unit for receiving a packet flowing on a network; Holding means for holding a monitoring start command and a monitoring packet amount input from the CPU, counting means for counting the amount of packets received by the receiving means after starting packet monitoring by input of the monitoring start command, and Means for comparing the value of the means with the value of the monitoring packet amount held by the holding means, and detecting that they match, analyzing the packet received by the receiving means, and outputting the output of the comparing means. Calculating means for determining whether or not the packet of the monitoring packet amount has been received based on the Display means for displaying the result of the determination by the calculating means. 5. A network monitoring method for monitoring a packet of a network system for performing data communication by a packet communication method using a wired or wireless method between a plurality of devices by using a programmed computer, comprising the steps of: A receiving procedure for receiving, a holding procedure for holding a monitoring start command and a monitoring packet amount input from the outside, and counting a packet quantity received by the receiving means after starting packet monitoring by inputting the monitoring start command. A comparing step of comparing the count value of the counting step with the value of the monitoring packet amount held by the holding unit, and detecting that they match each other; and analyzing the packet received by the receiving step. Together with the packet of the monitoring packet amount based on the output of the comparison procedure. Network monitoring method but which is characterized by comprising a calculation procedure to determine whether it is received, and a display procedure for displaying the discrimination result of the calculation procedure. 6. A computer-readable recording medium storing a network monitoring control program for executing, by a programmed computer, a packet of a network system for performing data communication by a packet communication method between a plurality of devices using a wired or wireless communication. In the recording medium, a receiving procedure for receiving a packet flowing on the network, a holding procedure for holding a monitoring start command and a monitoring packet amount input from the outside, and starting the packet monitoring by inputting the monitoring start command, A counting procedure for counting the number of packets received in the receiving procedure, a comparing procedure for comparing the count value of the counting procedure with the value of the monitoring packet quantity held in the holding procedure, and detecting that they match, While analyzing the packet received in the receiving procedure, A network monitoring control program for causing the computer to execute a calculation procedure for determining whether or not a packet of the monitoring packet amount has been received based on the output of the comparison procedure, and a display procedure for displaying a determination result of the calculation procedure. A recording medium characterized by being recorded. 7. A network monitoring device for monitoring a packet of a network system for performing data communication by a packet communication method using a wired or wireless method between a plurality of devices, a receiving means for receiving a packet flowing on a network, Holding means for holding the monitoring start command and the maximum value and the minimum value of the monitoring packet cycle inputted from the input unit; and a measuring means for measuring the cycle of the packet received by the receiving means by the input of the monitoring start command; Comparing means for comparing the measured value of the measuring means with the maximum value and the minimum value held by the holding means, and detecting whether the measured value is out of the range from the maximum value to the minimum value, The receiving means analyzes the received packet and, based on the output of the comparing means, sets the cycle of the received packet to the maximum value. Network monitoring apparatus characterized by comprising a calculating means for determining whether the outside to Luo minimum, and display means for displaying a determination result of said arithmetic means. 8. A network monitoring method for executing, by a programmed computer, a packet of a network system for performing data communication by a packet communication method between a plurality of devices using a wired or wireless communication, wherein a packet flowing on a network is A receiving procedure for receiving, a monitoring start command input from outside, and a holding procedure for holding a maximum value and a minimum value of a monitoring packet cycle, and a cycle of the packet received in the receiving procedure by the input of the monitoring start command. The measurement procedure to be measured, the measured value of the measurement procedure is compared with the maximum value and the minimum value held in the holding procedure, and whether the measured value is out of the range from the maximum value to the minimum value is determined. A comparing procedure for detecting, and analyzing the packet received in the receiving procedure, and based on an output of the comparing procedure A calculation procedure for determining whether the cycle of the received packet is out of the range from the maximum value to the minimum value, and a display procedure for displaying a determination result of the calculation means. Network monitoring method. 9. A computer-readable recording medium storing a network monitoring control program for executing, by a programmed computer, a packet of a network system for performing data communication by a packet communication method between a plurality of devices using a wired or wireless communication. In the recording medium, a receiving procedure for receiving a packet flowing on the network, a monitoring start command input from the outside, a holding procedure for holding a maximum value and a minimum value of a monitoring packet cycle, and an input of the monitoring start command, A measurement procedure for measuring the period of the packet received in the reception procedure, and comparing the measured value of the measurement procedure with the maximum value and the minimum value held in the holding procedure, and the measured value is the minimum value from the maximum value And a comparison procedure for detecting that the packet is out of the range, and a packet received in the reception procedure. And a calculation procedure for determining whether or not the cycle of the received packet is outside the range from the maximum value to the minimum value based on the output of the comparison procedure, and a determination result of the calculation means. A network monitoring control program for causing the computer to execute a display procedure for displaying the program. 10. The network monitoring device according to claim 1, further comprising a wireless two-way communication unit, wherein the network monitoring device belongs to an external network independent of a network to which the network monitoring device belongs. A network monitoring device, which is controlled by an external device. 11. The network monitoring apparatus according to claim 10, wherein a transmission / reception unit of a weak radio wave is used as a wireless two-way communication unit, and data recording a state of the network is transmitted to an external device by the transmission / reception unit. A network monitoring device, characterized in that: 12. The network monitoring device according to claim 11, wherein a metal wiring having an antenna function is formed on the same substrate together with all means of the network monitoring device. . 13. The network monitoring apparatus according to claim 10, wherein optical communication is used as wireless two-way communication, and data recording a state of the network is transmitted to an external device by said transmission / reception means. Network monitoring device. 14. The network monitoring device according to claim 13, wherein a photo-receiving device for optical communication is provided.
A network monitoring device, wherein a diode and an LED or a laser diode, which is a transmitting element for optical communication, are formed on the same substrate together with all means of the network monitoring device. 15. The network control device according to claim 13, wherein the transmission / reception system conforms to the IrDA standard. 16. The network monitoring device according to claim 1, wherein a detachable auxiliary storage electronic device is connected to transmit and receive various data. -A network monitoring device comprising face means. 17. The network monitoring device according to claim 16, wherein said interface means comprises a PCMC.
A network controller characterized by conforming to the IA standard. 18. The network monitoring apparatus according to claim 1, further comprising a display unit for displaying a monitoring result in a diagram. . 19. The network monitoring apparatus according to claim 18, wherein: an audio data reproducing unit; a frequency analyzing unit for generating frequency distribution data of the audio data from the audio data reproducing unit; and a display capable of displaying a graph. And a switching means for switching between the frequency distribution data from the frequency analysis means and the packet type distribution data output by each station connected to the network and outputting the data to the graph display means. . 20. The network monitoring apparatus according to claim 18, wherein a video data reproducing unit including audio data, a frequency analyzing unit for generating frequency distribution data of audio data from the video data reproducing unit, and a graph are displayed. Display means for displaying, and switching means for switching between the frequency distribution data from the frequency analysis means and the packet type distribution data output by each station connected to the network and outputting the data to the graph display means. Network monitoring device. 21. A network control device according to claim 20, wherein sound source means for indicating a station on the network in which a failure has occurred by voice is formed on the same board. 22. The network control apparatus according to claim 21, wherein said sound generated by said sound source means includes means for changing a pitch according to a station in which a failure has occurred. 23. The network monitoring device according to claim 1, wherein said network monitoring device is connected to an external network independent of a network to which said network monitoring device belongs. An instruction table means for recording an instruction set referred to by a processing unit of a control device belonging to an external network; and a data packet from the external network for judging whether or not an instruction set in the instruction table means is included. Network monitoring means for determining whether a data packet includes an instruction set in the instruction table means, and deleting the data packet if the data packet is determined by the determination means. apparatus. 24. The network monitoring device according to claim 23, further comprising communication data storage means for storing communication data from an external network.