JPH08111891A - Communications system - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] It is possible to prevent data collision on the trunk line of data transmission / reception, and to prevent the communication driver connected to the trunk line from being destroyed. Improve reliability and multiplex the system. [Structure] A master station 13 and a slave station 14 are grouped and used only in a wireless communication section between the master station and the slave station that have been grouped I
An ID code adding means for setting the D code and adding the ID code to the communication data is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for transmitting and receiving data in a spread spectrum wireless communication system, for example.

[0002]

2. Description of the Related Art For example, as shown in FIG. 1, in a large store, a large number of terminals 10 such as ECRs (electronic cash register) are branched from a trunk line 12 of a communication controller 11 connected to a host computer. (Multi-drop)
In a POS system (point-of-sale information management system) that is connected by, and performs sales management, inventory management, product management, etc. at the time of sale, when the terminal 10 is newly installed or relocated, the connection of the branch line is troublesome. There is a problem that workability of new construction and relocation is poor.

In order to solve the above problems, FIG.
Between the terminals 10 and the main line 12, for example, a plurality of master stations 13 using a wireless communication device of spread spectrum wireless communication system.
(13a, 13b ...) and the slave station 14 (14a, 14b, 1
4c ...) is provided for wirelessly transmitting and receiving data. By adopting wireless communication in this way, the above-mentioned problems can be solved and workability of new or relocated terminals can be improved. Can be improved.

However, when a plurality of parent stations 13 ... Are connected to the trunk line 12, for example, the radio waves transmitted from the slave station 14b are received by the two parent stations 13a and 13b, so that data collides on the trunk line 12. A new defect occurs. This problem is usually dealt with by changing the channel of the wireless section or changing the spreading code, but if the level of the undesired radio wave is high, it may be erroneously received. Yes, not only data collision, but also trunk line 1
The problem that the communication driver etc. connected to 2 is destroyed also occurs.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a communication system capable of improving the reliability of communication and communication data and multiplexing the system.

[0006]

The invention according to claim 1 of the present invention is a communication system for wirelessly communicating between a plurality of master stations and a plurality of slave stations. A communication system in which an ID code adding unit that sets an ID code to be used only in a wireless communication section between the parent station and the child station that are grouped and adds the ID code to a communication message is grouped. Is characterized by.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the slave station side has an I
Setting means for setting the D code is provided, and the master station side is
The communication system is provided with storage means for storing the ID code of the slave station and determination means for comparing the ID code of the received data with the ID code stored in the storage means to determine an appropriate code. To do.

According to the invention of claim 3 of the present invention, in addition to the configuration of the invention of claim 1, the master station side has an I
Setting means for setting the D code is provided, and the slave station side is
The communication system is provided with storage means for storing the ID code of the master station and determination means for comparing the ID code of the received data with the ID code stored in the storage means to determine an appropriate code. To do.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the invention, a communication system in which a spread spectrum code is assigned to the one group is characterized.

According to a fifth aspect of the present invention, in addition to the configuration of the second aspect of the present invention, it is a communication system using a keyboard as the ID code setting means on the slave station side.

According to a sixth aspect of the present invention, in addition to the configuration of the first aspect of the invention, the slave station side is provided with radio wave monitoring means for monitoring radio radio waves in a communication area, and the radio wave monitor. Obtain the ID code used by the group from the communication message of radio waves monitored by the means,
The communication system is provided with an ID code acquisition unit that uses this as a set ID code.

According to a seventh aspect of the present invention, in addition to the configuration of the first aspect of the invention, the slave station side is provided with a radio wave intensity monitor means for monitoring the radio wave intensity of the radio wave of the communication area. , The ID code used by the group is obtained from the communication message of the strong radio wave monitored by the radio field intensity monitor, and this is used as the set ID code I
A communication system including a D code acquisition means.

According to the invention of claim 8 of the present invention, in addition to the structure of the invention of claim 1, the slave station side is provided with a reception frequency monitoring means for monitoring the reception frequency of radio waves in the communication area. An ID code acquisition unit that acquires the ID code used by the group from the communication message of the radio wave that has been frequently received and is monitored by the reception count monitoring unit, and uses this as the set ID code. It is characterized by a communication system.

According to a ninth aspect of the present invention, in addition to the configuration of the first aspect of the invention, the slave station side is provided with a storage means for storing ID codes of a plurality of groups and a communication failure. It is characterized in that it is a communication system comprising detection means for detecting, and switching means for switching to another ID code stored in the storage means when the detection means detects communication failure.

According to a tenth aspect of the present invention, in addition to the configuration of the first aspect of the invention, the master station side monitors the terminal ID code of all terminals connected to the slave station. And a setting means for setting a terminal ID code which is not monitored by the terminal monitor means when the terminal ID code is given to the terminal on the slave station side.

[0016]

In the communication system according to the first aspect of the present invention, since the group ID code used by the group is added to the communication message between the master station and the slave station, the group is set to the master station and the slave station. When a communication message with a group ID code other than the above is received, the received message is discarded, the validity of the received message is judged, and communication within the group becomes possible. As a result, the same message It is possible to avoid data collision on the main line and erroneous reception due to duplicate reception of data.

In the communication system according to claim 2 of the present invention, the group ID code is set by the setting means on the slave station side,
If it is stored in the storage unit on the master station side, it can be determined whether or not the communication is for the group by determining the groove ID code of the communication message transmitted from the slave station side by the determination unit.

In the communication system according to claim 3 of the present invention, the group ID code is set by the setting means on the master station side,
If it is stored in the storage means on the side of the slave station, the determination means determines the groove ID code of the communication message transmitted from the side of the master station, so that it can be determined whether the communication is for the group.

In the communication system according to claim 4 of the present invention, a spread spectrum code is assigned to one group of the master station and the slave station in addition to the group ID code used by the group. Provide reliable communication.

In the communication system according to the fifth aspect of the present invention, the setting means for setting the group ID code on the slave station side is set, for example, by inputting with a keyboard so that the ECR connected to this slave station can also be used. To do.

In the communication system according to claim 6 of the present invention, the radio wave monitoring means on the side of the slave station monitors the radio waves in the communication area, and the communication area is selected from the communication telegrams of the communication area in which the slave station is located. The group ID code of the communication group using is acquired by the ID code acquisition means and set as the group ID code of the slave station.

In the communication system according to claim 7 of the present invention, the radio wave intensity monitor means of the slave station monitors the radio wave intensity of the radio wave in the communication area, and the group ID code used by the communication message of the strong radio wave. Is obtained by the ID code obtaining means and set as the group ID code of the slave station.

In the communication system according to claim 8 of the present invention, the reception frequency monitoring means on the slave station side monitors the reception frequency of the radio waves in the communication area, and the group ID code used by a large number of received radio waves is ID code. The acquisition unit acquires and sets the group ID code of the slave station.

In the communication system according to claim 9 of the present invention, the switching means stores when the slave station side performs communication using a predetermined group ID code and the detection means detects that this communication is impossible. The communication is executed in another communication group by switching to another group ID code stored in the means.

A communication system according to claim 10 of the present invention is
At the time of new installation or relocation of a terminal, when the terminal ID code of the terminal is requested from the slave station side connecting the terminal, the setting means of the master station sets the terminal ID code not monitored by the terminal monitor means.

[0026]

According to the invention described in claim 1 of the present invention, the group I used by the group in the communication message between the master station and the slave station.
If a D code is added and this match is confirmed, and if the match cannot be confirmed, the received message is discarded, and it is possible to determine the validity of the received message and to communicate only within the group.
As a result, it is possible to avoid data collision on the main line due to duplicate reception of the same communication message and erroneous reception, to ensure the reliability of the received message and to ensure that the communication areas of the master stations are overlapping. Also, accurate communication can be performed, and the system can be multiplexed without depending on the channel or spread code.

Further, since the communication between the parent station and the child station within the group is completely equivalent to the existence of a wired transmission path, a change from wired to wireless or a mixture of wired and wireless is performed. The system can be easily constructed, and the wireless communication device that does not affect the existing system can be operated.

According to the second and third aspects of the present invention, in addition to the effect of the first aspect of the invention, the group ID code can be set from the slave station side or the master station side. The code can be set from the master station side when there are many slave stations, and from the slave station side when the slave station is newly installed or relocated, the optimum setting work can be selected and workability is improved. improves.

According to the invention described in claim 4 of the present invention, in addition to the effect of the invention described in claim 1, since the spread spectrum code is assigned to the group, more accurate communication without interference or erroneous reception can be executed. . For example, if the spreading codes are the same even if they are in different groups, if they emit radio waves at the same time, they will be mutually noise sources, but by having a unique spreading code for each group, mutual noise can be avoided. As a result, erroneous reception can be prevented and the reliability of received data can be improved. This is effective when a new station or a new station is relocated by changing the layout. .

According to the invention of claim 5 of the present invention, in addition to the effect of the invention of claim 1, the group I is set on the slave station side.
When setting a D code, for example, in the case of a terminal equipped with an input keyboard such as an ECR connected to the slave station, the setting operation can be easily performed by using the keyboard.

In addition to the effect of the invention described in claim 1, the inventions described in claims 6, 7 and 8 of the present invention monitor the radio wave, the field intensity and the number of times of reception in the communication area, and monitor them. Group I used in communication messages from
By acquiring the D code, the group ID code can be automatically set, and the setting is simplified.

According to a ninth aspect of the present invention, if the slave station cannot communicate with a predetermined group ID code, it can switch to another group ID code and execute communication with another communication group. It is possible to avoid communication failure as much as possible.

According to the tenth aspect of the present invention, when a terminal is newly installed or relocated, the terminal ID code of the terminal can be easily obtained, and workability is improved.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a configuration of a communication system. In a large store, for example, a branch line (multi-drop) from a trunk line 12 of a communication controller 11 connected to a host computer or the like is used to connect a plurality of wireless communication devices of spread spectrum wireless communication system. The master stations 13a, 13b, 13c ... Are connected, and the groups A, B, C ... are set between the master stations 13a, 13b, 13c ... In the communication areas with the slave stations 14a, 14b, 14c. are doing.

For example, the group A is the master station 13a and the slave stations 14a1 to 14an, the group B is the master station 13b and the slave stations 14b1 to 14bn, and the group C is the master station 13c and the slave stations 14c1 to 14cn.

Regarding the connection between the mobile station 14 and the terminal 10, each of the mobile stations 14a1 to 14an is connected with a single or a plurality of terminals 10a1-1 to 10an-n.
4b1 to 14bn are respectively connected to a single or a plurality of terminals 10b1-1 to 10bn-n, and slave stations 14c1 to 1
4cn has a single or a plurality of terminals 10c1-
Connect 1 to 10 cn-n.

The terminal 10d is connected to the main line 12 by wire.

Further, each of the groups A, B and C described above includes the master stations 13a, 13b and 13 of the groups A, B and C.
A common group ID code (authentication code or identification code) that is added to the communication message and used only in the wireless communication section between c and the respective slave stations 14a, 14b, 14c is set. For example, the group A is “01”, the group B is “02”, and the group C is “03”. It should be noted that in the above example, the same code is used for the parent station and the child stations for each of the groups A, B, and C, but as another method,
In each of the groups A, B, and C, different codes may be set for the master station, the slave stations, and the slave stations. Of course, it is necessary to set a different code that does not overlap with other groups. In this case, the master station stores the code of each slave station and determines the coincidence at the time of reception. Furthermore, each terminal 10 has a terminal ID code (or an identification number, a machine number) for identifying each terminal 10 from each other. Is set.

FIG. 4 shows a radio communication device 15 of the spread spectrum radio communication system, which is used as each master station 13 and each slave station 14. CPU20 is ROM
Each circuit device is driven and controlled according to a program stored in (not shown), and the memory 21 stores necessary data such as a group ID code and a terminal ID code.

The radio section 23 connected to the antenna 22 performs signal processing such as modulation of a transmission signal and demodulation of a reception signal, and the wired interface 24 is connected to the radio communication device 15.
When it is used as a master station 13, it is connected to the trunk line 12, and when it is used as a slave station 14, it is connected to the terminal 10.

The external device side interface 25 is connected to an external keyboard 26 and a display 27, and the keyboard 26 executes setting of a group ID code and input of a terminal ID code to be monitored. Data and other required data. Then, the set group ID code and the monitored terminal ID code are stored in the memory 21.

When the wireless communication device 15 is used as the slave station 14 to connect the terminal 10, the terminal 10 is provided with a setting mode so that the terminal 10 can change the setting from the terminal 10 to the terminal 10.
It is possible to set the group ID code and the terminal ID code using the keyboard of.

As a result, the setting of the group ID code is
From the master station 13 and the slave stations 14, each terminal 10 ...
And the group ID code set from each of them is stored in each memory 21.

FIG. 5 shows another example of the wireless communication device 15 described above. In the device 15 shown in FIG. 4, the keyboard 26 and the display 27 are connected from the outside, but in this embodiment, The configuration is provided with the setting unit 28 and the display unit 29, and the other configurations are similar to those described with reference to FIG. 4. Therefore, the same functions are denoted by the same reference numerals and detailed description thereof will be omitted. The above-mentioned setting unit 28 is composed of a keyboard to set the group ID code and monitor the terminal I.
The input of the D code is executed, and the display unit 29 displays the set or input data and other necessary data.

For example, the group ID code "0" is assigned to the master stations 13a, 13b, 13c of the groups A, B, C described above.
When 1 ”,“ 02 ”, and“ 03 ”are set, each master station 13a,
13b and 13c, which are respectively stored in the memory 21 of the wireless communication device 15 shown in FIG. 4 or FIG. 5 and further correspond to each master station, the slave stations 14a1 to 14a.
The n, 14b1 to 14bn, and 14c1 to 14cn are also stored in the memory 21 of the above-described wireless communication device 15 which constitutes the slave station.

Next, the master station 1 formed by the wireless communication device 15
3, the communication processing operation of the CPU 20 between the slave station 14 and the slave station 14 is shown in FIG.
This will be described with reference to FIG. For example, when polling the specified terminal 10, the specified terminal 10
“Terminal ID code and polling” is output from the communication controller 11 to the trunk line 12.

Upon receiving the above-mentioned data, all the parent stations 13a, 13b, 13c add their own group ID codes "10", "02" and "03" to the data and wirelessly transmit them (steps n1 to n5).

That is, the master station 13a of group A is "terminal ID code and polling +01", the master station 13b of group B is "terminal ID code and polling +02", and the master station 13c of group C is "terminal ID code and The polling +03 ″ data is wirelessly transmitted to each slave station 14 side.

For example, if the terminal 10 to be polled is the terminal 10b1-1 connected to the child station 14b1 of the group B, the following processing is performed. That is, all the slave stations 14 ... Receive data in their respective groups, and the slave station 14b1 therein receives the "terminal ID code (terminal 10b1-1) of data and polling + 0".
2 ", the slave station 14b1 of the group B stores its memory 2
The group ID code "02" stored in No. 1 is compared with the group ID code "02" in the above-mentioned received data (steps n1, n6, n7).

Since the group ID code "02" matches, the slave station 14b1 polls the data "terminal ID code (terminal 10b1-1) +0".
The group ID code "02" is removed from "2", the data is edited into "terminal ID code (terminal 10b1-1) and polling", and this data is sent to the terminal 10b1-1 (steps n8, n9). ).

On the other hand, the slave stations 14a ..., 14c of the master stations 13a, 13c of the groups A, C different from the group B described above.
, The group ID code is different from "01" or "03", there is no match between the group ID codes, and the received data is discarded by each of the slave stations 14a ..., 14c ... (Step n10).

Further, in the group B, the slave stations 14b1-2 to 14b1-n other than the slave station 14b1-1 have the same group ID code "02". The ID code is removed, the data of "terminal ID code (terminal 10b1-1) and polling" is edited, and this data is sent to the terminal 10 side. However, since the terminal ID codes of the terminals 10b2-1 to 10b2-n are different, the terminals 10b2-1 to 10b2-n are different.
The data is discarded at n.

As a result, the polling of the specified terminal 10 from the communication controller 11, that is, "terminal ID code (terminal 10b1-1) and polling" is surely received only by the terminal 10b1-1.

When the above-mentioned terminal 10b1-1 receives the "polling", an acknowledgment ACK is sent as a response to the slave station 14b.
Send to b1.

When the above-mentioned slave station 14b1 receives the "acknowledgement ACK" from the terminal 10b1-1, this "acknowledgement AC" is received.
The group ID code “02” is added to K, that is, the data of “acknowledgement ACK + 02” is edited and wirelessly transmitted to the master station 13b side (steps n1 to n5).

That is, the above-mentioned master station 13b wirelessly receives the "acknowledgement ACK + 02" of the above-mentioned data, and the group ID code "02" stored in the memory 21 of the master station 13b and the above-mentioned received data. Compare with group ID code "02" (step n
1, n6, n7).

Since the group ID code "02" matches, the master station 13b removes the group ID code "02" from the data "acknowledgement ACK + 02" and edits it into the "acknowledgement ACK" data. Then, this data is sent to the trunk line 12 (steps n8 and n9).

On the other hand, the parent stations 13a and 13c of the groups A and C different from the above-mentioned group B are the slave stations 14b1
Even if the data “acknowledgement ACK + 02” is received, since the group ID codes of the master stations 13a and 13c are “01” or “03” and different, there is no group ID code match and the received data is Master station 13
a and 13c are discarded (step n10). Therefore, only the data from the master station 13b is transmitted onto the trunk line 12, so that no collision of "acknowledgement ACK" occurs on the trunk line 12 at all.

[Other Embodiments] The group ID code is set by the keyboard 26 (see FIG. 4) and the setting unit 28 (FIG. 5) from the master station 13 side or from the slave station 14 side, respectively.
You can set it by operating
By providing a setting mode in the terminals 10 ... Connected to the terminal 4, the settings can be made also from a keyboard (not shown) provided in the terminals 10.

Furthermore, since the wireless communication device 15 is a communication device of spread spectrum wireless communication system, the group A,
By assigning a unique spread spectrum code to each of B and C on a group basis and using the group ID code and this spread spectrum code together, more reliable communication can be obtained.

For example, when the slave station 14 is newly installed or relocated,
If you set the slave station 14 in the communication area of the group,
The slave station 14 can receive radio waves flying around in the communication area at that location.

Therefore, the radio wave is transmitted to the slave station 14, and
The function of monitoring the strength of the radio wave, the function of monitoring the group ID code used by the group in the communication area from the communication message of the radio wave, and the number of times the group ID code is used ( By adding the function of monitoring the frequency of use, for example, the activation code from the terminal enters the ID code setting mode, and in the communication area , for example, a strong radio wave, a frequently used code, etc. A code (a valid master station) can be acquired, and the slave station 14 has a function of using the acquired group ID code as its own group ID code, thereby automatically setting the group ID code. Is possible, which is particularly effective for newly establishing or relocating the slave station 14. The above-described automatic setting of the group ID code can also be executed with the start-up when the power is turned on.

Further, in the slave station 14, in addition to its own group ID code, the group I of the adjacent group
The D code is stored in the memory 21, and when transmission by the own group ID code is interrupted, it is switched to another group ID code and switched to another master station 13 to avoid transmission failure. be able to. For this switching, a group ID code having a high frequency of use may be stored in order based on the aforementioned radio wave monitor, and switching may be performed in this order.

Further, in setting the group ID code when the slave station 14 is newly installed or relocated, the wireless communication device 15 constituting the master station 13 or the slave station 14 is provided with the indicators 27 and 29. Group I used in the communication area
It is also possible to display the D code and set this.

The above-mentioned detection when the own slave station 14 becomes out of communication is detected, for example, when the polling for the own slave station 14 can be received only by the group ID code of the master station 13 of another group (for example, the master station). (No transmission from the station) or polling the slave station 14 by itself
When the polling for the same own slave station 14 is retransmitted (for example, the reception failure of the master station) despite the transmission of "CK", the master station 13 of the own group is defective. As described above, the transmission failure is detected by judging the transmission failure by the own group ID code, the own group ID code is switched to another adjacent group ID code, and the transmission is switched to another master station 13, Transmission interruption can be avoided.

Further, the master station 13 can monitor the terminal ID code of the terminal 10 since it polls the terminal and sends and receives an acknowledgment ACK from the terminal. Therefore, a function of monitoring the terminal ID code is added to the master station, and when the slave station 14 is newly installed or relocated, when the terminal 10 connected to the slave station 14 requests the master station 13 to set the terminal ID code, A terminal ID code (vacant code) not monitored by the monitor can be assigned to the terminal 10 from the master station 13.

Further, in the wireless section between the master station 13 and the slave station 14, it is determined whether or not there is an error in the received data, and if there is an error, the received data is sent to the trunk side 12 or the wired side of the terminal 10 or the like. It is possible to avoid errors in the wireless section by prohibiting output and returning error data to the wireless transmission side with a code defined only in the wireless section and instructing normal data retransmission. . In this case, if the wire is the main line 12, it is possible to prevent data collision, driver destruction, and system failure due to sending error data, and if the wire is the terminal 10, reduce unnecessary error processing. be able to.

Furthermore, when the slave station 14 is newly installed or relocated,
The slave station 14 or the terminal 10 to which the slave station 14 is connected is provided with an acceleration sensor for detecting a horizontal movement to have a function of monitoring the movement direction, and also has a function of monitoring the intensity of the above-described radio wave and a radio wave. By providing the display function for instructing the movement in the strong direction, the slave station 14 can be installed at the optimum position.

Further, in setting the group ID code, when a code common to all master stations is also included in addition to the code unique to the master station, and the slave station receives data having this common code, the data is unconditionally set. If you accept
A convenient communication is also obtained in which one data is transmitted to all terminals at the same time.

In the correspondence between the configuration of the present invention and the above-described embodiment, the parent station and the child station of claim 1 of the present invention are the parent station 13 and the child station 14 which are constituted by the wireless communication device 15 of the embodiment. Correspondingly, similarly, the ID code adding means corresponds to the keyboard of the terminal 10, the keyboard 26 of the wireless communication device 15, and the setting unit 28, and the setting means of claims 2 and 3 of the present invention corresponds to the terminal 10. Keyboard, wireless communication device 15
Corresponding to the keyboard 26 and the setting unit 28 of the wireless communication device 15, the storage means corresponds to the memory 21 of the wireless communication device 15, the determination means corresponds to the CPU 20 of the wireless communication device 15, and the setting according to claim 5 of the present invention. The means corresponds to the keyboard of the terminal 10 and the keyboard 26 of the wireless communication device 15, and the radio wave monitoring means and the ID code acquiring means according to claim 6 of the present invention correspond to the CPU 20 of the wireless communication device 15.
The radio field intensity monitoring means and I according to claim 7
The D code acquisition means corresponds to the CPU 20 of the wireless communication device 15, and the reception frequency monitoring means and the ID code acquisition means according to claim 8 of the present invention are the CP of the wireless communication device 15.
U20, the storage means according to claim 9 of the present invention corresponds to the memory 21 of the wireless communication device 15, and the detection means and the switching means correspond to the CPU 20 of the wireless communication device 15. The terminal monitor means and the setting means described in 10 correspond to the CPU 20 of the wireless communication device 15, but the present invention is not limited to the configuration of the embodiment.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a communication system of a conventional terminal and a communication controller.

FIG. 2 is an explanatory view showing a wireless communication system of a conventional terminal and a communication controller.

FIG. 3 is an explanatory diagram showing a wireless communication system of a terminal and a communication controller.

FIG. 4 is a configuration block diagram of a wireless communication device.

FIG. 5 is a configuration block diagram of a wireless communication device of another example.

FIG. 6 is a flowchart showing a processing operation of a wireless communication device forming a master station and a slave station.

[Explanation of symbols]

 10 ... Terminal 11 ... Communication controller 12 ... Main line 13 ... Master station 14 ... Slave station 15 ... Wireless communication device 20 ... CPU 21 ... Memory 26 ... Keyboard 28 ... Setting unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H04L 11/00 321 (72) Inventor Nishiwaki Sequentially, 10 Ouron, Hanazono-cho, Ukyo-ku, Kyoto-shi, Kyoto Prefecture Within the corporation

Claims (10)

[Claims] 1. A communication system for wirelessly communicating between a plurality of master stations and a plurality of slave stations, wherein the master station and the slave stations are grouped, and the grouped master station and slave stations are grouped together. A communication system provided with an ID code adding means for setting an ID code used only in a wireless communication section and adding the ID code to a communication message. 2. A setting means for setting an ID code is provided on the slave station side, and a storage means for storing the ID code of the slave station on the master station side, an ID code of received data and the storage means. 2. The communication system according to claim 1, further comprising: a determination unit that compares the ID code stored in 1 to determine an appropriate code. 3. The master station side is provided with setting means for setting an ID code, and the slave station side is provided with a storage means for storing the ID code of the master station, an ID code of received data and the storage means. 2. The communication system according to claim 1, further comprising: a determination unit that compares the ID code stored in 1 to determine an appropriate code. 4. The communication system according to claim 1, wherein a spread spectrum code is assigned to said one group. 5. The communication system according to claim 2, wherein the ID code setting means on the slave station side is a keyboard. 6. A radio wave monitor means for monitoring radio waves in a communication area on the slave station side, and an ID code used by the group from among communication messages of radio waves monitored by the radio wave monitor means. The communication system according to claim 1, further comprising: an ID code acquisition unit that acquires the ID and uses the ID code as a setting ID code. 7. A radio wave intensity monitor means for monitoring the radio wave intensity of a radio wave in a communication area, and the group concerned from the strong radio wave communication telegrams monitored by the radio wave intensity monitor means on the slave station side. The communication system according to claim 1, further comprising: an ID code acquisition unit that acquires the used ID code and uses the acquired ID code as a setting ID code. 8. The slave station side is provided with a reception frequency monitor means for monitoring the reception frequency of radio waves in a communication area, and a communication message of radio waves with a high reception frequency monitored by the reception frequency monitor means. The communication system according to claim 1, further comprising: an ID code acquisition unit that acquires an ID code used by the group and uses the ID code as a setting ID code. 9. A storage unit for storing ID codes of a plurality of groups on the slave station side, a detection unit for detecting communication failure, and a storage unit for storing the communication code when the detection unit detects communication failure. 2. The communication system according to claim 1, further comprising switching means for switching to another ID code that has been generated. 10. The master station side has terminal monitor means for monitoring the ID codes of all terminals connected to the slave station, and the terminal monitor means for giving the terminal ID code to the slave station side terminal. The communication system according to claim 1, further comprising setting means for setting an unmonitored terminal ID code.