JPH02143752A - Data communication system - Google Patents

Abstract

PURPOSE:To allow a slave equipment to belong to plural groups without a change in a group code and to receive a data from a master equipment as a slave equipment of each group by allowing a slave equipment to a validate a received data when two group codes are coincident and aborting a received data in the case of noncoincidence. CONSTITUTION:The system consists of a master equipment 10 and slave equipments 20, 30, 40 connecting respectively to the master equipment 10 via communication lines 101 - 103. When the two group codes are coincident, the slave equipment validates the received data and in the case of noncoincidence, the received data is aborted. Thus, when one slave equipment belongs to plural groups, the master equipment 10 attains data communication with one slave equipment at the slave equipment of each group without revising the setting of the slave equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication system between a main device and a plurality of slave devices.

[Conventional technology]

In some data communication systems of this type, each slave device belongs to a group. An example of such a data communication system is shown in FIG.

In this conventional data communication system, a main device 50 communicates with slave devices 60 to 60 through communication lines 101 to 103, respectively.
80 and data transmission. This main device 50 includes a group code management section 51, an information processing section 52, and a communication section 53.
The slave devices 60-80 each include communication units 61-81, information processing units 62-82, and group code setting units 63-83.

In this data communication method, one group code is assigned to each slave device. That is, the group codes of the groups to which the slave devices 60 to 80 belong are set in the group code setting units 63 to 83 of the slave devices 60 to 80, respectively. When the main device 50 transmits data to such a slave device, the main device 50 adds a group code to the communication data and sends it. When the group code of the received data matches the group code assigned to the slave device, the slave device validates the received data.

[Problem to be solved by the invention]

In the conventional data communication system described above, only one group code can be set in the group code setting section for each slave device. Therefore, if a slave device belongs to two groups and communicates with the master device, sometimes as one group and sometimes as the other group, the group code must be set each time. The disadvantage is that it has to be changed.

An object of the present invention is to eliminate such drawbacks, and when one slave device belongs to multiple groups, the master device can use this one slave device as a slave device of each group without changing the settings of this slave device. The object of the present invention is to provide a data communication method that allows data communication with a slave device.

[Means to solve the problem]

The present invention provides a data communication method for transmitting data between a main device and slave devices divided into a plurality of groups, in which the main device transmits data to each of one or more groups to which each slave device belongs. A management means for managing the code, and a control means for creating data to be transmitted by adding the group code of the group to which the slave device sending the data belongs, retrieved by searching the management means, to the communication data to be sent to the slave device. 1 processing means, and a first communication means for transmitting data created by the first processing means to the plurality of groups, and each of the plurality of slave devices has one or more processing means to which the slave device belongs. a setting means for presetting a group code of a group; a second communication means for receiving data from the first communication means; extracting a group code from the data received by the second communication means; A second method that compares and analyzes the code and a group code preset in the setting means.
As a result of the analysis by the second processing means, if the two group codes match, the slave device validates the received data, and if they do not match, the slave device discards the received data. It is characterized by

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

This data communication method consists of a main device 10 and a communication line 101.
．． It is composed of a main device 10 and slave devices 20, 30, and 40 connected to each other via 102 and 103, respectively.

Furthermore, the main device 10 includes a group code management section 11;
It is composed of an information processing section 12 and a communication section 13, and the slave devices 20 to 40 each include communication sections 21 to 41, information processing sections 22 to 42, and group code setting sections 23 to 4.
It is composed of 3.

In addition, in this data communication method, slave devices 20 to 40
is divided into two groups. And slave device 20
The group name of the group to which and 30 belong is rAJ, and the group name of the group to which slave devices 20 and 40 belong is rBJ.

In a data communication system with such a configuration, the main device 10
The group code management unit 11 manages group codes for slave devices. That is, the group code management unit 11 manages the group name rAJ of the group to which the slave devices 20 and 30 belong, and the group name rBJ of the group to which the slave devices 20 and 40 belong.

When transmitting data from the main device IO to the slave devices 20 to 40, the information processing unit 12 adds group code data based on the group code of the group code management unit 11 to communication data sent to the slave devices 20 to 40. Create.

The communication unit 13 sends data created by information processing to the communication unit'! Send to fA101-103.

The group code setting section 23 of the slave device 20
This is to set the group code to which the group belongs.

That is, the group code setting section 23 includes the slave device 20
belongs to group rAJ, so this group name rAJ
is set in advance.

The communication unit 21 receives data from the communication line 101.

The information processing unit 22 extracts group code data from the data received by the communication unit 21, and sets the group name indicated by this group code data and the group code setting unit 2 in advance.
Compare the group names set in 3 and analyze whether the group names match.

Communication units 31 and 41 of slave devices 30 and 40. Information processing section 32
and 42, and the group code setting sections 33 and 43 are also connected to the communication section 21. and 42 of the slave device 20, respectively. Information processing section 22. It is similar to the group code setting section 23.

Next, the operation of this embodiment will be explained.

When transmitting data to a group to which slave devices 20 and 30 belong, the main device 10 receives information from the group code management section 11,
The group name of the group to which the slave devices 20 and 30 belong is searched. Group name rAJ of group code management section 11
When searching for , the information processing unit 12 turns on the bit 201 corresponding to this group name rAJ, as shown in the data format of FIG. Further, the information processing unit 12 adds the group code data 200 with the bit 201 set to "on" to the communication data 300. The communication unit 13 transmits data obtained by adding the group code data 200 to the communication data 300 to the communication lines 101 to 103 all at once.

The slave devices 20 to 30 each receive data from the main device 10.

In the slave device 20, data from the communication line 101 is
The communication unit 21 receives it. The information processing unit 22 extracts group code data from the data received by the communication unit.

On the other hand, in the group code setting section 23 of the slave device 20, according to the group code setting format shown in FIG.
The group name to which the slave device 20 belongs is set in advance.

Since the slave device 20 belongs to groups rAJ and rBJ, vias 401 and 402 shown in FIG. 3 are "on". As a result, the group names rAJ and rBJ are set in the group code setting section 23 in advance.

When the information processing unit 22 of the slave device 20 extracts the group code data from the received data, it compares the group name rAJ indicated by this group code data with the group name set in the group code setting unit 23. Then, it is analyzed whether the group name rAJ indicated by the group code data is applicable. As a result of this analysis, since the group names match, the slave device 20 validates the received data.

In the slave device 30, since the slave device 30 belongs to the group rAJ, the group code setting section 33 has the group name r
AJ is set in advance. When the information processing unit 32 extracts the group code data from the data received by the communication unit 31, the information processing unit 32 extracts the group name r indicated by this group code data.
AJ is compared and analyzed with a preset group name. As a result of this analysis, since the group names match, the slave device 30 validates the received data.

In the slave device 40, since the slave device 40 belongs to the group rBJ, the group name rBJ is set in the group code setting section 43 in advance. When the information processing unit 42 extracts the group code data from the data received by the communication unit 41, the information processing unit 42 compares and analyzes the group name rBJ indicated by this group code data with a preset group name. As a result of this analysis, the group names do not match, so
The slave device 40 discards the received data as invalid.

Similarly, when the main device 10 transmits data to a group belonging to the slave device 20 and the slave device 40, the main device 10 transmits data to the group code data 200 shown in FIG.
Turn 2 on. As a result, data from the main device 10 is received by the slave devices 20 and 40.

In this way, this embodiment allows one slave device to belong to a plurality of groups by setting whether or not it belongs to a certain group on a bit-by-bit basis in setting the group code of the slave device. Then, by adding a group code with the bit of the group name for which data is to be transmitted from the master device set to “on” to the communication data and sending it out, the master device can send one Data communication can be performed with the slave device as a device belonging to group "A" at some times and as a device belonging to group rBJ at other times.

〔Effect of the invention〕

As explained above, when slave devices are divided into multiple groups, the present invention enables
One slave device can belong to multiple groups and receive data from the main device as a slave device of each group.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing an example of the format of data transmitted in the embodiment of FIG. 1, and FIG. FIG. 4 is a diagram showing an example of a group code setting format of the group code setting section in the embodiment of FIG. 1, and FIG. 4 is a block diagram showing an example of a conventional data communication system. 10...Main device 11...Group code management section 12...Information processing section 13...Communication section 20, 30.40...Slave device 21, 31.41 ... Communication department 22, 32.42 ... Information processing section 23, 33.43 ... Group code setting department disease 1
Figure 3rd ward

Claims (1)

[Claims] (1) In a data communication method in which data is transmitted between a main device and slave devices divided into multiple groups, the main device transmits each group code of one or more groups to which each slave device belongs. a first control unit that creates data to be sent by adding a group code of a group to which a slave device sending data belongs, retrieved by searching the management means, to communication data to be sent to the slave device; processing means; and a first communication means for transmitting data created by the first processing means to the plurality of groups, and each of the plurality of slave devices includes one or more groups to which the slave device belongs. a setting means for presetting a group code; a second communication means for receiving data from the first communication means; extracting a group code from the data received by the second communication means; and a second group code preset in the setting means for analysis.
As a result of the analysis by the second processing means, if the two group codes match, the slave device validates the received data, and if they do not match, the slave device discards the received data. A data communication device characterized by: