JPH0282842A - Communication system and equipment - Google Patents

Abstract

PURPOSE:To enhance the reliability of communication between plural controllers and plural terminal equipments by stopping the control and invalidating a data of communication deviated from a synchronizing signal when a frame end signal is absent within a prescribed time from the synchronizing signal. CONSTITUTION:A data of 1, 0, 1 is added without fail to the end of a sent data and the resulting signal is used as an end frame signal. When a time elapse between a synchronizing signal and the equipment is deviated in any equipment, since the processing is stopped till the next synchronizing signal arrives, the communication data deviated from the synchronizing signal is invalidated. Thus, the communication speed between plural controllers and plural terminal equipments is increased and the reliability of data is enhanced.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an HA (home automation) system that organically connects a plurality of terminal devices and a plurality of controllers by connecting home electrical appliances as terminals to a common transmission path. The present invention relates to a communication method and device with excellent data reliability. (Prior Art) In a conventional HA system, a communication device for an HA (home automation) system that organically connects multiple terminal devices such as air conditioners, home buses, etc. and multiple controllers is disclosed in Japanese Patent Application Laid-Open No. 62-142431. As disclosed in the publication, the address set for each terminal device is included in the control signal sent from the controller, and there are no signals sent from other controllers or other terminals when sending. After confirming that this is the case, control signals are sent to multiple terminals via a common transmission path, and the terminal device receives only the signal that matches the set address, so that control is differentiated from other terminal devices. There are things that can be done. With such communication devices, it has become possible to select from a plurality of terminal devices and freely stop, start, or leave the operation of some of the terminal devices. In addition, multiple communication devices transmit and receive at the same time using a single synchronization signal on a common transmission path proposed by the applicant, and the data to be communicated includes and can be distinguished from the communication destination and the communication content. There have been inventions of a communication method having a format and a device using this method. As shown in FIG. a switching means (12) for determining whether or not to transmit the communication data in advance of the communication data; and a transmission means (13) for transmitting the communication data from the logic operation means (16) to the transmission path only after receiving the synchronization signal. , demodulating means (14) for demodulating the communication data transmitted on this transmission path;
synchronization signal discrimination means (1) for discriminating between communication data and synchronization signals;
5), a logic operation means (16) having the following means, that is, a data conversion means (17) for connecting the terminal device and the transmitting means (13) and converting the data from the terminal device into distinguishable data, and demodulation. Data decoding means (20) for decoding the demodulated communication data from the data decoding means (14), display output means (23) for outputting the data from the data decoding means (20) to a display device for displaying, data decoding means ( 2
means (21) for determining whether output to the terminal device is possible based on the data from 0); and data output means for outputting data to the terminal device only when output is possible according to the means (21) for determining whether output to the terminal device is possible. (24). (Problems to be Solved by the Invention) In recent years, the development of HA systems has been remarkable in response to the trend of seeking comfort in life, and the types of electrical equipment used there have also increased. With the conventional technology disclosed in Japanese Patent Application Laid-open No. 62-142431, it has become possible to freely stop, start, or leave the operation of some terminal devices; Since the operating status of the terminal device can only be known after confirming that no operating status signal is sent from the terminal device, it takes time to instruct an operation and know the result. Therefore, if it were possible to transmit and receive at the same time using a single synchronization signal and distinguish from which device the communication is coming from, the time could be reduced, but as the types of electrical appliances used increase, the control circuit If the reliability of the communicated data is impaired due to a temporary drop in the power supply voltage, noise, jamming waves, etc., if the controlled device does not send a signal indicating that the communication is normal, Control signals are sent without regard to the normal operation of the electrical equipment or the safety of its operation, which can lead to serious accidents. The present invention solves these problems, allows simultaneous transmission and reception using one synchronization signal, increases the communication speed between multiple controllers and multiple terminal devices, and provides excellent data reliability. Provides communication methods and devices. (Means for solving the problem) The present invention has a common transmission path with a plurality of communication devices,
In a communication method in which multiple communication devices simultaneously transmit and receive using a single synchronization signal, the data to be communicated includes the communication destination and the communication content, and has a distinguishable format. A communication method characterized by transmitting and receiving a signal indicating the end of communication after the end of communication, and determining that normal communication has occurred only when the time elapsed from the synchronization signal is within a certain range, and the transmission and reception of signals. a synchronizing signal generating means (11) that generates a synchronizing signal to determine the start time of the synchronizing signal at regular intervals, and the synchronizing signal generating means (11)
a switching means (12) for determining whether or not to transmit the synchronization signal from the synchronous signal before the communication data; and a transmission means for transmitting the communication data from the logic operation means (16) onto the transmission path only after receiving the synchronization signal. (13), means (27) for transmitting a frame end signal indicating the end of communication, and demodulating means (27) for demodulating the communication data transmitted on this transmission path.
14), synchronization signal discrimination means (15) for discriminating communication data and synchronization signals, and logic operation means (15) having the following means:
16), that is, data conversion means (17) that connects the terminal equipment and the transmission means (13) and converts the data from the terminal equipment into distinguishable data, and decodes the demodulated communication data from the demodulation means (14). Data decoding means (20)
, display output means (23) for outputting the data from the data decoding means (20) to a display device for displaying, and means (21) for determining whether the data from the data decoding means (20) can be output to a terminal device. and a data output means (24) that outputs data to the terminal device only when output is possible according to the means (21) for determining whether or not to output to the terminal device, and means (28) for determining whether the frame end signal is appropriate. It is a device. The present invention will be explained below using the drawings. As shown in FIG. 1a, as a plurality of communication devices l,
Ib, lc, ld, 1e --- are connected to one common transmission path 3, and each communication device 1 has a terminal device 5.
In an HA system in which 1a, 51b, 51c, 51d, 51e, etc. are connected, the data 4 communicated on one common transmission path 3 is binary as shown in Figure 1. Data b,,b,,...b that can take
7, and one bit of the data 4 is sent to the terminal devices 51a, 5lb, 51c, 51d.
, 51e..., one of the two values is set to operate that function, and the other is set to stop operating, and synchronization is performed as shown in Figure 1C. Even if the signal 2, the data 4, and the frame end signal 6 transmitted from each communication device are handled in chronological order, and all the communication devices 1a, Ib, lc, 1d, le, etc. transmit and receive at the same time, Which terminal device 51a, 51b, 51c, 51
d, 51e... or which terminal device 51a, 51b, 51c, 51d, 51e...
. . is in operation, and each communication device calculates the logical sum of all the frame end signals 6 received at the same time to check the elapsed time from the synchronization signal. In the device, a synchronization signal 2 that determines the start of signal transmission
The synchronizing signal generating means 11 that generates the signal at regular intervals can be constructed using a frequency dividing circuit that is a combination of a generally known oscillation circuit and a logic gate. In addition, when using a micro combinator, it can be configured using a clock signal that serves as a reference for its operation, and a frequency divider circuit that combines logic gates in hardware.
This synchronization signal 2, which can also perform a similar operation with software, is changed to a signal of a different level from the communication data 4 signal, or given a special code, or a signal It is used after being modulated differently from the data. Switching means 1 for determining whether or not to transmit the synchronizing signal 2 from the synchronizing signal generating means 11 before the communication data 4
2, any switch can be used as long as it is used as a switch. This switch is the first transmission line 3.
Among the plurality of communication devices 1 connected to the communication device 1, only the communication device 1 used as a communication controller is closed and used, and the other communication devices 1 are not closed. Any means may be used instead of this switch as long as it is not connected on the circuit. The transmitting means 13 for sending the communication data 4 from the logic operation means 16 to the transmission path only after receiving the synchronization signal 2 temporarily stores the communication data 4 and transmits the communication data by inputting the synchronization signal 2. 4 in time series, a circuit that handles the output from the parallel-serial converter as a voltage signal, a circuit that converts it into an optical signal, and a circuit that converts it into a tone burst wave. You can use either. In addition, communication data 4 is temporarily stored and synchronization signal 2
In order to output the communication data 4 in chronological order according to the input of the logic operation means 16, a program may be incorporated in the logic operation means 16 to perform this function, and the configuration of each is not particularly limited as long as it is currently used. . As the demodulating means 14 for demodulating the communication data 4 transmitted on this transmission line, the signal from the transmitting means 13 can be converted to a photocoupler for the optical transmission line, a circuit for demodulating the tone burst wave, or a voltage signal can be converted as it is. It consists of one of the demodulation circuits to be used and a serial-to-parallel converter for converting the communication data 4 demodulated by the demodulation circuit from time-series data to easily handled parallel data and temporarily storing it. In this case, a program may be built into the logic operation means 16 to convert the communication data 4 demodulated by the demodulation circuit from time-series data into parallel data that is easy to handle, and to temporarily store the data. However, each configuration is not particularly limited as long as it is currently used. As shown in FIG.
If the levels of the data 4 and data 4 signals are different, a comparator is used for comparison using a reference level matched to each threshold level. Further, as shown in FIG. 3, when the signals are of the same level and have a special code, a circuit for decoding the code or a program provided in the logic operation means 16 is used. Alternatively, if a modulation different from that of the signal data is applied, a circuit that demodulates only that modulation is used. The above is a device that was previously submitted by the applicant of the present application, but as a feature of the present invention, the present invention further includes a means 27 for transmitting a frame end signal 6 indicating the end of communication, and a means for determining whether the frame end signal 6 is appropriate. 28, and the means 27 for transmitting the frame end signal is not particularly limited as long as it uses the same means as the data transmitting means and can always output the same signal after data is communicated. Further, as the means 28 for determining whether or not the frame end signal 6 is appropriate, a clock signal using a frequency dividing circuit that is a combination of an oscillation circuit and a logic gate, or a clock signal that is a reference for the operation of a microcomputer is used. The elapsed time from the synchronization signal and the frame end signal 6 are determined by a frequency divider circuit that is a combination of logic gates constructed from hardware that uses signals, and by a timer that uses a clock signal that performs similar operations.
It is only necessary to be able to make a comparison with For example, the frame end signal 6 is input to an integrating circuit, its output and the output of a timer are input to a gate circuit, and the time is set by using two circuits that can obtain an output only at a certain time depending on the shell hold level. It is also possible to adjust the range so that communication is reliable. Furthermore, when using a microcomputer, it is also possible to treat the time divided by the clock signal as one bit, take the frame end signal 6 as several bits, and make a judgment based on the numerical value. Therefore, when the frame end signal 6 is not received within a certain period of time from the synchronization signal, by stopping the control 'n and waiting for the next signal, the communication data that deviates from the synchronization signal can be invalidated. (Operation) The present invention disables communication that deviates from the synchronization signal by using the method and configuration of the communication device described above, so that it is possible to select from a plurality of terminal devices and stop or start the operation of some terminal devices. , it is possible to freely leave the device alone, and it is also possible to improve the authenticity of communication between multiple controllers and multiple terminal devices. Embodiment In order to generate a synchronization signal at regular intervals to determine the start of signal transmission, a one-chip microcomputer HDD4010 is used.
10 (Hitachi, Ltd., trade name) clock signal, and use a snap switch to determine whether or not to transmit the synchronization signal generation circuit in advance of communication data. connected to the output of This switch is connected to the synchronization signal input terminal of the transmitting circuit, and is closed only when the communication device is used as a communication controller of an HA system. Further, the transmitting circuit, demodulation circuit, and synchronization signal discrimination circuit of the communication device other than the communication controller rectify and smooth the synchronization signal from the communication controller and use it as a power source.
When the communication device is not used as a communication controller, the timing of transmission and reception is determined by the synchronization signal extracted by the synchronization signal discrimination circuit. Transmit data only after receiving a synchronization signal! The transmitting circuit for sending data to the IIA route uses the user work area of the memory in the one-chip microcomputer as a memory for temporarily storing transmitted data, and outputs the data at the falling edge of a synchronizing signal. An instruction (left shift instruction) to move the data in the accumulator to the CPU's accumulator in the microcontroller, move the data in the accumulator up one bit at a time, and move the most significant bit to the lowest via (left shift instruction), and output it to a specific address Q. The instructions were repeated alternately, and the most significant address Q was connected to the data input terminal of the transmitting circuit. Also, as a serial-to-parallel converter for reception, the demodulated serial data is placed in the top of another specific address N, all other digits are set to O, and the data is transferred from that address to the accumulator of the CPU in the microcontroller. An instruction (left shift instruction) that moves the data in the accumulator up one bit at a time and moves the most significant bit to the least significant bit (left shift instruction), and moves the moved data to the next address N.
The serial data was converted to parallel data using a program by combining the instruction to logically OR the serial data with all other digits set to O's. As a demodulation circuit for demodulating the communication data transmitted on this transmission line, the following communication data is detected by detecting the fall of the synchronization signal discriminated by a comparator whose inverting input terminal is connected to the transmission line. and a frame end signal are converted from time-series data into parallel data that is easy to handle via a comparator with a reference voltage of 2°5, and the serial data is temporarily stored.
The data is stored in a shift register serving as a parallel converter, and by detecting the rising edge of a synchronizing signal after the storage is completed, the data is stored in an area different from the area in which the transmission data of the one-chip microcomputer is stored. In a controller, many switches such as a keyboard are arranged in a matrix, and an address selector is connected to each column line so that one address can be selected.
The program sweeps through the addresses in order, and when the switch is pressed, output appears on the line. The data to be transmitted was created by a program that transferred the signal from the line in that row to the memory built into the microcomputer and changed the state of only the bits corresponding to the functions of the terminal equipment to be controlled to other states. Further, as shown in FIG. 4a, data of 1,0.1 is always added at the end of the data to be transmitted, and this is used as an end frame signal. Therefore, when data is received, the last L
The data should be 0.1, but if the synchronization signal and the time elapsed time of any one device are different,
As shown in Figure 4, the transmission line is wired-OR, so it may be 0.0, 0, 0.1, etc.
．． 0. Only in case of an end-of-frame signal of l, the program can proceed to the next step; otherwise,
Since processing is stopped until the next synchronization signal, communication data that deviates from the synchronization signal can be invalidated. (Effects of the Invention) As explained above, the present invention provides a communication method and device that can increase the communication speed between multiple controllers and multiple terminal devices, and can also improve data reliability. can be provided.

[Brief explanation of the drawing]

FIG. 1a is a block diagram for explaining the present invention in detail;
FIG. 1 is a diagram showing the structure of data for explaining the present invention in detail, FIG. 1 C is a diagram showing the relationship between synchronization signals and data for explaining the present invention in detail, and FIG. FIG. 3 is a block diagram of a communication device according to the invention, FIG. 3 is a circuit diagram showing the outline of the device used in an embodiment of the invention, and FIG. FIG. 4 is a diagram showing signal waveforms in each communication device when communication is not normal in an embodiment of the present invention. Explanation of symbols 1. Communication device 2. Synchronization signal 3, transmission line 41 communication data 6, frame end signal 11, synchronization signal generation means 12, switching means 13. Transmission means 14, demodulation means 15. Synchronous signal discrimination means 16°20°21°23°24°27°28°Logic operation means 17. Means for data conversion Means for decoding data Means for deciding whether or not to output data to a terminal device Means for outputting to a display device Means for outputting to a terminal device Means for transmitting a frame end signal Means for deciding whether or not communication is appropriate based on the frame end signal Means for attorney representation Shi Hirose Akira No. 1! ! ! l (a) Figure (b) Figure 2 Figure (C) Procedural amendment (voluntary) 1. Display of the case 1986 Patent Application No. 235197 2, Name of the invention Communication method and device 3, Person making the amendment Relationship to the case Patent applicant address 2-1-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name (
445) Hitachi Chemical Co., Ltd. Representative Ryoji Yokoyama 4, agent residence ■163 2-1-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo
No. Hitachi Chemical Co., Ltd. Telephone: Tokyo 346-3111 (Main representative) Name (85
30) Patent Attorney Akira Hirose ・) 5. Full text of the specification to be amended and drawings 6. Specification of the contents of the amendment 1. Name of the invention Communication method and device 2. Scope of claims ■. Multiple communication devices and A communication method that has one common transmission path, multiple communication devices transmit and receive simultaneously using one synchronization signal, and the data to be communicated includes the communication destination and communication content, and has a distinguishable format. In this case, all of the multiple communication devices send and receive a signal indicating the end of communication after the end of the communication, and it is determined that the communication was normal only if the time elapsed from the synchronization signal is within a certain range. A communication method characterized by: 2. A synchronizing signal generating means (11) that generates a synchronizing signal that determines the start time of signal transmission/reception at regular intervals, and transmitting the synchronizing signal from the synchronizing signal generating means (11) prior to communication data. a switching means (12) for determining whether or not to operate, and a transmitting means (13) for transmitting the communication data from the logic operation means (16) to the transmission path only after receiving a synchronization signal.
9i means (14) for detecting the communication data transmitted on this transmission path; and synchronization signal discriminating means (18) for discriminating the communication data from the synchronization signal.
(Timing due to the attack of 1B)
a logical operation means (16) having the following means, that is, a data conversion means (21) for connecting a terminal device and the transmitting means (13) and converting data from the terminal device into distinguishable data; 14) A data decoding means type for decoding the communication data received from the data decoding means type, a display output means (23) for outputting the data from the data decoding means type to a display device, and a terminal device by the data from the data decoding means type. data output means (25
), a communication device comprising means (26) for determining whether or not a frame end signal is appropriate by comparing the frame of the data and the detected frame 6. 3. Detailed Description of the Invention (Field of Industrial Application) The present invention is an HA that organically connects a plurality of terminal devices and a plurality of controllers by connecting household electrical devices as terminals to a common transmission path. The present invention relates to communication methods and devices with excellent data reliability in (home automation) systems. (Prior Art) In a conventional HA system, as a communication device for an IA (home automation) system (which organically connects multiple terminal devices such as air conditioners, home buses, etc. and multiple controllers), Japanese Patent Application Laid-Open No. 62- As disclosed in Japanese Patent No. 142431, the address set for each terminal device is included in the control signal sent from the controller, and when the control signal is sent out, the sendout signal from another controller or other terminal is Control signals are sent to multiple terminals via a common transmission path after confirming that there are no There are things that can be done. With such communication devices, it has become possible to select from a plurality of terminal devices and freely stop, start, or leave the operation of some of the terminal devices. In addition, multiple communication devices transmit and receive at the same time using a single synchronization signal on a common transmission path proposed by the applicant, and the data to be communicated includes and can be distinguished from the communication destination and the communication content. There have been inventions of a communication method having a format and a device using this method. As shown in FIG. 5, this device includes a synchronizing signal generating means 11 that generates a synchronizing signal at regular intervals to determine the start time of signal transmission and reception, and a synchronizing signal from the synchronizing signal generating means 11 as communication data. a switching means 12 that determines whether or not to transmit data in advance of transmission; a transmitting means 13 that transmits the communication data from the logical operation means 16 to the transmission line only after receiving a synchronization signal; It has a receiving means 14 for receiving data, a synchronizing signal discriminating means 18 for discriminating received communication data and a synchronizing signal, and the following means whose operation timing is determined by the synchronizing signal from the synchronizing signal discriminating means 18. Logical operation means 16, that is, data conversion means 21 which connects a terminal device and transmission means 13 and converts data from the terminal device into distinguishable data, and data decoding means 22 which decodes communication data received from reception means 14. , a display output means 2 for outputting data from the data decoding means 22 to a display device for displaying the data;
3. A means 24 for determining whether to output data to the terminal device based on the data from the data decoding means 22, and a data output means for outputting data to the terminal device only when output is possible by the means 24 for determining whether to output to the terminal device. This is a communication device consisting of 25 parts. (Problems to be Solved by the Invention) In recent years, the development of HA systems has been remarkable in response to the trend of seeking comfort in life, and the types of electrical equipment used there have also increased. With the conventional technology disclosed in Japanese Patent Application Laid-open No. 62-142431, it has become possible to freely stop, start, or leave the operation of some terminal devices; Since the operating status of the terminal device can only be known after confirming that no operating status signal is sent from the terminal device, it takes time to instruct an operation and know the result. Therefore, if it were possible to transmit and receive at the same time using a single synchronization signal and distinguish from which device the communication is coming from, the time could be reduced, but as the types of electrical appliances used increase, the control circuit If the reliability of the communicated data is impaired due to a temporary drop in the power supply voltage, noise, jamming waves, etc., if the controlled device does not send a signal indicating that the communication is normal, Control signals are sent without regard to the normal operation of the electrical equipment or the safety of its operation, which can lead to serious accidents. The present invention solves these problems, allows simultaneous transmission and reception using one synchronization signal, increases the communication speed between multiple controllers and multiple terminal devices, and provides excellent data reliability. Provides communication methods and devices. (Means for solving the problem) The present invention has a common transmission path with a plurality of communication devices,
In a communication method in which multiple communication devices simultaneously transmit and receive using a single synchronization signal, the data to be communicated includes the communication destination and the communication content, and has a distinguishable format. A communication method characterized by transmitting and receiving a signal indicating the end of communication after the end of communication, and determining that normal communication has occurred only when the time elapsed from the synchronization signal is within a certain range, and this communication method. Synchronization signal generating means 1 which is a device used in
1, a switching means 12 for determining whether or not to transmit the synchronization signal from the synchronization signal generating means ll before the communication data, and a switching means 12 for transmitting the communication data from the logic operation means 16 to the transmission path only after receiving the synchronization signal. a transmitting means 13 for receiving the communication data transmitted to this transmission line, a receiving means 14 for receiving the communication data transmitted to this transmission line, a synchronizing signal discriminating means 18 for discriminating between the received communication data and the synchronizing signal, and a synchronizing signal discriminating means 18. Logic operation means 16 having the following means whose operation timing is determined by the synchronization signal of , that is, data conversion means 21 which connects the terminal equipment and the transmission means 13 and converts data from the terminal equipment into distinguishable data; Data decoding means 22 decrypts the communication data received from the receiving means 14, display output means 23 outputs the data from the data decoding means 22 to a display device for displaying it, and data from the data decoding means 22 is sent to a terminal device. means 24 for determining whether to output data to the terminal device; data output means 25 for outputting data to the terminal device only when output is possible by the means 24 for determining whether to output to the terminal device; and a data output means 25 that stores in advance a frame end signal indicating the end of communication. means 17, synchronization signal discrimination means means 19 for outputting the frame end signal stored after a certain time from the synchronization signal from the first day to the transmission means 13;
and a means 26 for comparing the frame end signal of the received communication data with a frame end signal stored in advance and determining whether the frame end signal is appropriate. The present invention will be explained below using the drawings. As shown in FIG. 1a, a plurality of communication devices 1 include la,
lb, lc, ld, 1e---one common transmission line 3
, and each communication device 1 is connected to a terminal device 51.
In an HA system in which a, 51b, 51c, 51d, 51e, etc. are connected, the data 4 communicated on one common transmission path 3 is binary as shown in Figure 1. Data that can take bO=bl+...b,
, and one bit of the data 4 is sent to the terminal devices 51a, 51b, 51c, 51d, 51e, .
..., one of the two values is set to operate the function, and the other is set to stop the operation, and as shown in FIG. 1C, the synchronization signal 2 and the above Data 4 and frame end signal 6 sent from each communication device
are handled in chronological order, and all communication devices 1a, tb,
Even if lc, 1d, le... transmit and receive at the same time, which terminal devices 51 a, 5 l b, 51 c, 51
d, 51e... or which terminal device 51a, 51b, 51c, 51d, 5
Make it possible to distinguish whether 1e... is operating,
Each communication device calculates the logical sum of all the frame end signals 6 received at the same time, and checks the time deviation from the synchronization signal. In the device, a synchronization signal 2 that determines the start of signal transmission
The synchronizing signal generating means 11 that generates the signal at regular intervals can be constructed using a frequency dividing circuit that is a combination of a generally known oscillation circuit and a logic gate. In addition, when using a microcomputer, it can be configured using a clock signal that serves as a reference for its operation, and a frequency dividing circuit that combines logic gates in hardware.
This synchronization signal 2, which can also perform a similar operation with software, is changed to a signal of a different level from the communication data 4 signal, or given a special code, or a signal It is used after being modulated differently from the data. Switching means 1 for determining whether or not to transmit the synchronizing signal 2 from the synchronizing signal generating means 11 before the communication data 4
2, any switch can be used as long as it is used as a switch. This switch is the first transmission line 3.
Among the plurality of communication devices 1 connected to the communication device 1, only the one used as a communication controller is closed and used, and the other communication devices 1 are not closed. Any means may be used instead of this switch as long as it is not connected on the circuit. The transmitting means 13 for sending the communication data 4 from the logic operation means 16 to the transmission path only after receiving the synchronization signal 2 temporarily stores the communication data 4 and transmits the communication data by inputting the synchronization signal 2. 4 in time series, a circuit that handles the output from the parallel-serial converter as a voltage signal, a circuit that converts it into an optical signal, and a circuit that converts it into a tone burst wave. You can use either. In addition, communication data 4 is temporarily stored and synchronization signal 2
In order to output the communication data 4 in chronological order according to the input of the logic operation means 16, a program may be incorporated in the logic operation means 16 to perform this function, and the configuration of each is not particularly limited as long as it is currently used. . As the receiving means 14 for receiving the communication data 4 transmitted on this transmission line, the signal from the transmitting means 13 can be used as a photocoupler for the optical transmission line, a circuit that demodulates the tone burst wave, or a voltage signal as it is. It consists of one of the receiving circuits to be used and a serial-parallel converter for converting the communication data 4 received by the receiving circuit from time-series data to easy-to-handle parallel data and temporarily storing it. In this case, a program may be built into the logic operation means 16 to convert the communication data 4 received by the receiving circuit from time series data to easy-to-handle parallel data and temporarily store the data to carry out the function. However, each configuration is not particularly limited as long as it is currently used. As shown in FIG.
If the levels of the data 4 and data 4 signals are different, a comparator is used for comparison using a reference level matched to each threshold level. Further, as shown in FIG. 3, when the signals are of the same level and have a special code, a circuit for decoding the code or a program provided in the logic operation means 16 is used. Alternatively, if a modulation different from that of the signal data is applied, a circuit that demodulates only that modulation is used. Data conversion means 21 that connects a terminal device and the transmission means 13 and converts data from the terminal device into distinguishable data.
, a data decoding means 22 for decoding the communication data received from the receiving means 14, a display output means 23 for outputting the data from the data decoding means 22 to a display device for display,
A means 24 for determining whether to output data to the terminal device based on the data from the data decoding means 22, and a data output means 25 for outputting data to the terminal device only when the means 24 for determining whether to output to the terminal device allows output. A computer device, particularly a microcomputer, is usually used as the logical operation means 16, and each data is treated as a digital signal.The data conversion means 21, the data decoding means 22, the display output means 23, and the possibility of output to a terminal device are determined. Means of deciding 2
4 and data output means 25 for outputting data to the terminal device.
is performed by each input/output function of the microcomputer and software. The above is the device described in the application previously filed by the applicant, but as features of the present invention, the device further includes a means 17 for pre-storing a frame end signal indicating the end of communication, and a synchronization signal from the synchronization signal discriminating means 18. Means 19 outputs the stored frame end signal to the sender vJL 13 after a certain time from the signal, and compares the frame end signal of the received communication data with the pre-stored frame end signal to determine the frame end signal. A means 26 for determining suitability is provided within the logical operation means 16. Means 1 for storing in advance a frame end signal indicating the end of communication
As 7, a semiconductor memory element, a magnetic recording element, etc. can be used, and as means 19 for outputting the stored frame end signal to the transmitting means 13 after a certain period of time from the synchronizing signal from the synchronizing signal discriminating means 1st. The means 26 can be configured by a timer function and an input/output function of a microcomputer, and compares a frame end signal of the received communication data with a frame end signal stored in advance to determine whether the frame end signal is appropriate. The logic operation function of a microcomputer can be used. At this time, if the pre-stored frame end signal and the received frame end signal do not match, it means that the time relationship between the signals is out of order somewhere during transmission and reception, and data is not sent and received properly. Further, means 2 for determining whether or not the frame end signal 6 is appropriate.
8, a clock signal using a frequency dividing circuit that combines an oscillation circuit and a logic gate, or, when using a microcomputer, a logic gate constructed by hardware using a clock signal that serves as the reference for its operation. It is also possible to compare the elapsed time from the synchronization signal with the frame end signal 6 using a combination of frequency dividing circuits or a timer using a clock signal that operates in a similar manner. For example, the frame end signal 6 is input to an integrating circuit, its output and the output of a timer are input to a gate circuit, and the time is set by using two circuits that can obtain an output only at a certain time depending on the threshold level. It is also possible to adjust the range so that communication can be trusted. In this way, when the frame end signal 6 is not within a certain time from the synchronization signal, as shown by the dotted line in FIG.
By controlling the means 24 for deciding whether to output to the terminal device, stopping control of the terminal device, and waiting for the next signal, it is possible to invalidate the communication data that deviates from the synchronization signal. (Operation) The present invention disables communication that deviates from the synchronization signal by using the method and configuration of the communication device described above, so that it is possible to select from a plurality of terminal devices and stop or start the operation of some terminal devices. , it is possible to freely leave it alone, and it is also possible to improve the reliability of communication between multiple controllers and multiple terminal devices. Example: In order to generate a synchronization signal at regular intervals to determine the start of signal transmission, a one-chip microcomputer HD40101 is used.
In order to determine whether or not the clock signal can be extracted from the clock circuit of 0 (Hitachi, Ltd., trade name) and the synchronization signal generation circuit can be transmitted prior to communication data,
I connected it to the output of the synchronous signal generator using a snap switch. This switch is connected to the synchronization signal input terminal of the transmission circuit, and is closed and used only when the communication device is used as a communication controller of the HA system. In addition, the power supply for the transmitting circuit, receiving circuit, and synchronous signal discrimination circuit of communication devices other than the communication controller uses the rectified and smoothed synchronous signal from the communication controller. When the communication device is not used as a communication controller, the timing of transmission and reception is determined by the synchronization signal extracted by the synchronization signal discrimination circuit. The transmission circuit that sends the transmission data to the transmission line for the first time after receiving a synchronization signal uses a part of the user work area of the memory in the one-chip microcontroller as a memory that temporarily stores the transmission data. The data output is sent to the CPU in the microcontroller at the falling edge of the synchronization signal.
, the data in the accumulator is moved up one bit at a time, and the most significant bit is moved to the least significant bit (left shift instruction), and the instruction to output to a specific address Q is repeated alternately. , address Q
The top end of is connected to the data input terminal of the transmitter circuit. Also, as a serial-parallel converter for reception, the received serial data is placed in the lowest order of another specific address N, all other digits are O's, and the data is transferred from that address to the accumulator of the CPU in the microcontroller. An instruction (left shift instruction) that moves the data in the achiemulator to the upper bit one by one, and moves the least significant bit to the most significant bit (left shift instruction), and moves the moved data to the next address N.
The serial data was converted into parallel data by a program by combining it with an instruction to logically OR the data with the serial data, with all other digits set to 0. The receiving circuit for receiving the communication data transmitted on this transmission line detects the falling edge of the synchronization signal discriminated by a comparator whose inverting input terminal is connected to the transmission line, and receives the subsequent communication data. and a frame end signal are converted from time-series data into parallel data that is easy to handle via a comparator with a reference voltage of 2°5, and the serial data is temporarily stored.
The data is stored in a shift register serving as a parallel converter, and by detecting the rising edge of a synchronizing signal after the storage is completed, the data is stored in an area different from the area in which the transmission data of the one-chip microcomputer is stored. In a controller, many switches such as a keyboard are arranged in a matrix, and an address selector is connected to each column line so that one address can be selected.
The program sweeps through those addresses in order, and when a switch is pressed, output appears on the line. The data to be transmitted was created by a program that transferred the signal from the line in that row to the memory built into the microcomputer and changed the state of only the bits corresponding to the functions of the terminal equipment to be controlled to other states. Further, as shown in FIG. 4a, data 1.0.1 is always added at the end of the data to be transmitted, and this is used as an end frame signal. Therefore, when receiving data, there is always 1 at the end.
．． The data should be 0.1, but if there is a difference between the synchronization signal and the time elapsed time of any one device, the transmission line is wired-OR as shown in Figure 4. ,1,0. o, 0.0. In some cases, 1.
The program can proceed to the next step only in the case of a frame end signal of 0.1, and in other cases it will stop processing until the next synchronization signal, so communication data that is out of sync with the synchronization signal will be invalidated. can. (Effects of the Invention) As explained above, according to the present invention, the communication method and device can increase the communication speed between multiple controllers and multiple terminal devices, and can also improve data reliability. can be provided.

[Brief explanation of the drawing]

FIG. 1a is a block diagram for explaining the present invention in detail;
FIG. 1 is a diagram showing the structure of data for explaining the present invention in detail, FIG. 1 C is a diagram showing the relationship between synchronization signals and data for explaining the present invention in detail, and FIG. A block diagram of a communication device according to the invention, FIG. 3 is a circuit diagram showing an outline of the device used in an embodiment of the invention, and FIG. 4a shows each communication device when communication is normal in an embodiment of the invention. FIG. 4 is a diagram showing signal waveforms in each communication device when communication is not normal in an embodiment of the present invention, and FIG. 5 is a block diagram of a communication device showing a conventional example. It is. Explanation of symbols 1. Communication device 2. Synchronization signal 3, transmission line 48 communication data 6, frame end signal 11, synchronization signal generation means 12, switching means 13. Transmitting means 14, receiving means 16. Logical operation means 17, means 18 for storing frame end signals, synchronization signal discriminating means 19, means 21 for outputting frame end signals, data conversion means 22, data decoding means 23, means 24 for outputting to display equipment, terminal equipment 25, data output means 26, and means for determining the appropriateness of the frame end signal.Representative Patent Attorney Akihiro Hirose 2 (a) (b) (c) Figure 1

Claims (1)

[Claims] 1. Having a common transmission path with a plurality of communication devices, the plurality of communication devices transmitting and receiving at the same time using a single synchronization signal, and the data to be communicated is communicated with the communication destination and the communication content. In a communication system that includes and has a distinguishable format, all of the plurality of communication devices transmit and receive a signal indicating the end of the communication after the end of the communication, and the time elapsed from the synchronization signal is within a certain range. A communication method that is characterized in that it is determined that there was normal communication only when 2. A synchronizing signal generating means (11) that generates a synchronizing signal that determines the start time of signal transmission/reception at regular intervals, and transmitting the synchronizing signal from the synchronizing signal generating means (11) prior to communication data. a switching means (12) for determining whether or not to operate, and a transmitting means (13) for transmitting the communication data from the logic operation means (16) to the transmission path only after receiving a synchronization signal.
, a means (27) for transmitting a frame end signal indicating the end of communication, a demodulating means (14) for demodulating the communication data transmitted on this transmission path, and a synchronization signal for distinguishing between communication data and a synchronization signal. a discriminating means (15), and a logical operation means (16) having the following means, that is, a data converting means (17) for connecting a terminal device and the transmitting means (13) and converting data from the terminal device into distinguishable data. ), data decoding means (20) for decoding the demodulated communication data from the demodulating means (14), display output means (23) for outputting the data from the data decoding means (20) to a display device for displaying the data; Data is output to the terminal device only when output is possible by means (21) for determining whether to output to the terminal device based on the data from the decoding means (20) and means (21) for determining whether to output to the terminal device. A communication device comprising data output means (24) and means (28) for determining the suitability of a frame end signal.