JPH05136795A - Communication system and communication equipment - Google Patents

Abstract

PURPOSE:To set and revise a communication address of a slave station remotely and definitely by allowing a master station to store logic identification data of a slave station and allowing the slave station to set logic identification data based on the identification data. CONSTITUTION:H/W switch switch information of all slave stations recognized by a master station is set in a data RAM 13 at application of power or the like by using a program in a CPU 11 and a memory 12. In this case, all the slave station address information in the data RAM 13 is set so that switch address (physical address) information and communication address (logical address) information with respect to one slave station are set one to one. When the information is sent from the master station to the slave station, the slave station reads its own station H/W switch by an address decoder 26 and when the content is the same as the content of a destination address, the communication address information set to the sender address is set to the data RAM 23 of its own station. The address of the slave station is set definitely by implementing the processing to all the slave stations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, for example, comprises a master station and a slave station, and the slave station is assigned its own station by addressing a plurality of slave stations connected to one master station. The present invention relates to a communication system and a communication device capable of responding an address to a master station.

[0002]

2. Description of the Related Art In FIG. 7, a plurality of slave stations 72 are connected in parallel to a master station 71 through one common line, and a call signal from the master station causes the slave station whose address is designated by the slave station. It is a general block diagram of a communication apparatus which responds to a master station.

FIG. 8 is a program flow diagram showing a conventional communication address setting means in each slave station. Conventionally,
In response to a slave station address setting command from the master station, the slave station uniquely sets the address of each slave station by reading the signal of the H / W switch address of the slave station into the communication memory. Then, communication is performed by further using it as a communication address.

[0004]

In the conventional communication address setting means, as described above, the H / W switch address =
Since it was used as the communication address, the address of the slave station was uniquely determined. Therefore, when an address is added due to expansion of a slave station, it is necessary to change the address of another slave station, or the change causes an address setting error. There was a problem such as address mismatch. In particular, when the slave station is installed in a remote place, it is necessary to go to the location of the slave station in order to change the address of the slave station.

The present invention has been made in order to solve the above problems, and it is possible to set and change the communication address of a slave station centrally and remotely according to the request of the master station. It is an object of the present invention to provide a communication system and a communication device that provide accurate communication means.

[0006]

A communication system and a communication device according to the present invention include, for example, a master station, which is a physical identification data fixedly determined to identify each slave station. A means for storing the H / W switch address information of the station and the communication address information of all the slave stations, which is the logical identification data that can be arbitrarily set by the master station to identify the slave station in the system, is provided. Is provided with means for setting and storing communication address information in response to a request from the master station.

[0007]

In the communication system and the communication apparatus according to the present invention, for example, in the master station, together with the H / W switch address information of all slave stations, communication address information arbitrarily designated by the master station is stored, and Since the station can set and store the communication address information in response to a request from the master station, the master station can centrally set the addresses of the slave stations.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be shown with reference to the drawings. FIG. 1 is a block diagram of the master station side communication device, and 11 is a CP.
U and 12 are memories for storing CPU programs.
Reference numeral 13 is a data RAM which is a storage device for storing the address of the slave station, and 15 is a communication control circuit for communicating with the slave station. FIG. 2 is a block diagram of a slave station communication device, in which 21 is a CPU, 22 is a memory, and 23 is a data RAM which is a storage device for storing an address at the request of the master station.
Is a communication control circuit. Further, 26 is an H / W switch of the slave station, which reads the address of the H / W switch into the data RAM 23 through the address decoder 27. Figure 3
This is the format of all slave station address information stored in the master station side data RAM 13. The address information includes H / W switch address information 31 and communication address information 32. FIG. 4 shows a message format 40 for communication between a master station and a slave station, and a message type 41.
By defining a communication address setting command in the above, it becomes possible to set the communication address of the slave station. FIG. 5 shows a program flow for setting a communication address on the slave station side.

The operation will be described below with reference to FIGS. In Figure 1, the H / W of all the child stations that the parent station recognizes
The switch address information is set in the data RAM 13 by a program stored in the CPU 11 and the memory 12 before the communication address for the slave station of the master station is set, for example, when the power is turned on. Here, H / W of the slave station
Since the switch address is fixedly determined, it can be considered as a physical address, and the communication address can be arbitrarily determined by the master station and can be changed, so that it can be considered as a logical address. At this time, the format of all slave station address information in the data RAM 13 is one-to-one correspondence between the H / W switch address information 31 and the communication address information 32 for one slave station, as shown in FIG. The form is as follows.

Next, FIG. 4 shows a communication message format 40 generally used in a communication system. In order to set the communication address 32 of the slave station, a communication address setting command is sent to the message type 41, and the H / W switch address information 31 of the slave station whose address setting is requested is sent to the destination address 42. In the original address 43, the communication address information 32 arbitrarily set by the master station and set in the slave station is set.

When the information in the communication message format 40 is transmitted from the master station to the slave station, it is processed according to the program flow shown in FIG. After receiving the data by the reception processing 51, the slave station checks the message type 41 of the communication message format 40 of FIG. 4 based on whether it is a communication address setting message (command) 53 as shown in the flow of FIG. As a result, if it is a communication address setting message, the H / W switch address reading means 56 causes the address decoder 26 to read the local H / W switch 27 of the slave station in FIG. Furthermore, the read H / W switch address of the own station is the destination address 42 (H / W) in the communication message format 40.
It is checked if 57 is the same as the content of the switch address 31), and if it is the same, the communication address setting means 58 sets the communication address information 32 set in the transmission source address 43 in the communication message format 40 to its own station. Data RAM 23.

Thereafter, the slave station uses the address (communication address information 32) stored in the data RAM 23 for communication with the master station.

The master station performs the above process for all slave stations, and the H / W switch address 3 of each slave station in FIG.
By storing the communication address 32 corresponding to 1 for all the slave stations, it is possible to arbitrarily request the slave station to set the communication address.

Example 2. In the first embodiment, the master station sets a communication address command to the specific slave station in the message type 41 of the communication message format 40 of FIG. 4, and sets the number of slave stations to which the process of FIG. By repeating, it is assumed that the communication addresses of all the slave stations are set. In addition, for example, a command "set all slave station communication addresses together" is set in the message type 41, and H / W switch address information and communication address information of slave stations are set in the information area 44 for all slave stations. By making the program flow as shown in FIG. 6 on the slave station side, it becomes possible to set communication addresses for all slave stations with one instruction. In this case, the traffic volume relating to the communication address setting of the transmission path is smaller than that in the first embodiment, which is advantageous for a system in which many slave stations are connected.

Example 3. In the first embodiment, in the master station,
The H / W switch address information and the communication address information are stored as a pair, but the two information storage areas may be separate and independent areas as long as the correspondence between the two pieces of information is clear. Alternatively, at least one of the two pieces of information may be stored in another storage location outside the memory device and used by referring to it.

Example 4. In the first embodiment, in the communication message format, the order of information set in each of the message type, the destination address, and the source address is the order of the communication address setting command, the H / W switch address information, and the communication address information. It doesn't have to be that way.

Embodiment 5. In the first embodiment, the example in which the communication address is set in the slave station is described, but the case of changing the communication address of the slave station that is originally set is also effective in the present invention.

[0018]

As described above, according to the present invention, means for storing at least the logical identification data of the slave station in the master station, and the slave station based on the stored logical identification data by the master station. By having at least means for setting the logical identification data in, it becomes possible to set the logical identification data of the slave station mainly in the master station, it is possible to achieve the agreement of the identification data of the master station and the slave station, The master station can remotely set the logical identification data to the slave station. In addition, this improves the maintainability and reliability of the communication system and the communication device, such as eliminating the setting error of the logical identification data on the slave station side.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a master station side communication device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a slave station side communication device according to the first embodiment of the present invention.

FIG. 3 is a format diagram of all slave station address information stored on the master station side according to the first embodiment of the present invention.

FIG. 4 is a message format diagram for communication between a master station and a slave station according to the first embodiment of the present invention.

FIG. 5 is a program flow diagram for setting a communication address on the slave station side according to the first embodiment of the present invention.

FIG. 6 is a program flow diagram for setting a communication address on the slave station side according to the second embodiment of the present invention.

FIG. 7 is a general configuration diagram of a conventional communication device.

FIG. 8 is a program flow diagram for setting a conventional communication address.

[Explanation of symbols]

 11 Master station CPU 12 Master station side memory 13 Master station side data RAM 15 Master station side communication control circuit 21 Slave station side CPU 22 Slave station side memory 23 Slave station side data RAM 25 Slave station side control circuit 26 Slave station side Address decoder 27 Slave station H / W switch 31 H / W switch address information 32 Communication address information 40 Communication format 41 Message type 42 Destination address 43 Source address 44 Information area 51 Reception process 52 Reception success check 53 Communication Address setting message check 54 Time station call check 55 Data transmission process 56 H / W switch address reading means 57 Own station H / W address check 58 Communication address setting means 71 Master station 72 Slave station

Claims (3)

[Claims] 1. A plurality of communication devices connected by a data transmission line, a predetermined communication device serving as a parent station, and having physical identification data for distinguishing between the own station and another station, In a communication system in which one or more connected communication devices are slave stations, a master station stores at least logical identification data corresponding to physical identification data of the slave station, and a slave station in the master station. A communication system comprising: means for setting at least the logical identification data based on the logical identification data stored in the station. 2. A plurality of communication devices connected by a data transmission line, a predetermined communication device serving as a master station, and one or more communication devices connected to the master station serving as slave stations, serving as a master station. In the communication device, a communication device including at least the following means (a) slave station data storage means capable of storing predetermined data of the slave station, (b) predetermined data stored by the slave station data storage means A slave station data setting requesting means for requesting the setting of identification data for distinguishing the slave station from other stations based on the above. 3. A plurality of communication devices connected by a data transmission line, a predetermined communication device serving as a master station, one or more communication devices connected to the master station serving as slave stations, and a slave station. In the communication device, a communication device including at least the following means: (a) receiving means for receiving data transmitted from the master station; (b) analyzing means for analyzing data received by the receiving means; (c) analyzing means Data setting means for setting and storing identification data for distinguishing between the own station and another station according to the result of analysis by.