JPH07101879B2 - Data control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a data control system in a bus system in which a plurality of communication control devices are connected via a communication line.

2. Description of the Related Art In a conventional bus system that adopts a distributed control method, the content of data sent from a communication control device is analyzed and the other communication control device is determined based on the content. Therefore, a procedure of generating and transmitting another data is often used, and a method in which the communication control device manages the data control sequence has been adopted.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a system, it is necessary for all communication control devices to have a data control sequence management capability. Therefore, a communication control device that does not have such a sequence management capability is a bus system. There was a problem that I could not connect to.

An object of the present invention is to solve the above problems and to obtain a distributed control system with simple processing.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention comprises communication data composed of a control code part and a communication data part, and the communication data part is composed of a plurality of address data, command data and end of data. Of the sub-data section of the communication data, the communication control apparatus which has received the communication data determines that the command data in the sub-data section at the head of the communication data is for the communication control apparatus, and after processing the contents, Excluding the data part, the control code part is rebiased by the address data included in the next sub-data part, and the communication data is transferred to the other communication control device indicated by the address data.

The present invention does not require the communication control device to manage the data sequence by the above-mentioned data transmission method, and can reduce the data processing procedure of the communication control device.

Practical example Figure 1 shows the communication data structure. The communication data is roughly divided into a sender address 1, a destination address 2, and a control code section 14 including a control code 3 and a communication data section 13. The source address 1 indicates where the communication data is sent from, the destination address 2 indicates which address the communication control device has, and the control code indicates the control attribute of the communication data. The section 13 shows the control contents. The communication data section 13 is composed of sub data sections 1 to 3, each sub data section being composed of sub destination address data, command data, and end of data.

In the case of the sub data part, the end of data 6 indicates the end of the data, the data 4 indicates the head byte of the sub data part, and the end of data 6 is continued by an arbitrary number. The sub-destination address 7 indicates the address of the partner communication control device to which the data up to the end of data 6 is to be sent thereafter.

FIG. 2 shows an example of a bus system configuration. This bus system includes a communication line 15, a communication controller 16, a communication controller 18,
Terminal 17, terminal 19, terminal via the communication control device 20, respectively
21 shall be connected. Communication data 22 from the terminal 17 via the communication control device 16, receiving the communication data 22 from the terminal 19 via the communication control device 18 and the communication line 15,
Receiving this, consider a case where the terminal 21 finally transmits the communication data 24 to the terminal 17 via the communication control device 20 and the communication line 15.

The contents of communication data are shown in FIGS. The communication data 22, the communication data 23, and the communication data 24 have the communication data structure shown in FIG. Communication data 22
Indicates the source address is 25, the destination address is 26, and the control code 27 is a specific control code. The data section includes a sub data section (a) 35, a sub data section (b) 36, and a sub data section (c) 37.

The sub data part (a) 35 comprises data (D) 28, 29 and end of data (EOD) 30 indicating the end of the sub data part, and the communication control device 16 having the address value A controls communication with the address value B. 3 shows communication data to be sent to the device 18. The communication control device 18, which has received the communication data 22 transmitted by the communication control device 16, determines that the sub data part 35 is the data part for itself and transmits only D28 and D29 excluding the EOD30 to the terminal 19. Then, the sub-address value C31 shown at the beginning of the sub-data section 36 is determined as the partner address to be sent next, and all the subsequent data is reconfigured as the communication data 23 as the data content to be sent and the communication line 15 Output to. Upon receipt of the communication data 23, the communication control device 20 receives the sub-data section 38.
The data (D) 32 indicated by is judged to be the data to be transmitted to the terminal 21, the data (D) 32 is transmitted to the terminal 21, and the data value (A) 33 indicated at the beginning of the terminal (C) 40 is next determined. It determines that the destination address value to be sent and the remaining data are the data to be sent next, and reconstructs the communication data 24 and sends it to the communication control device 16. The communication control device 16 that has received the communication data 24
Is the terminal for the data (D) 34 indicated by the sub-data section (C) 39
It judges that the data should be sent to 17, and transmits it to the terminal 17. The communication control device 17 ends the series of operations because there is no data after the sub data part 39.

EFFECTS OF THE INVENTION As described above, in the bus system in which a plurality of terminal devices each having a communication control device are connected via a communication line, one communication control device is connected to a plurality of other communication control devices. The data part following the control code part in the communication packet having the control sequence of is composed of a plurality of sets of address data, command data and end of data, except for the data to be processed by the communication control device which has received the communication data. Subsequent to the other communication control device having the address data shown, the address data in the communication data is converted into a control code part, the communication data part is reconfigured to be transmitted, and the communication data part is sequentially transmitted. The data control method is characterized in that the communication data section is passed until it is exhausted. By adopting this method, it is possible to construct a bus system by the distributed control method even with a communication control device having no data sequence processing capability with only simple processing.

[Brief description of drawings]

FIG. 1 is a communication data configuration diagram in the present invention, FIG. 2 is a bus system configuration diagram using a data control system of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of an example of the data control system. 15 …… communication line, 16,18,20 …… communication control device, 17,19,21
...... Terminal.

Claims (1)

[Claims] 1. In a bus system in which a plurality of terminals each having a communication control device are connected via a communication line, communication data comprises a control code section and a communication data section, and the communication data section is addressed. The communication control device, which is composed of a plurality of sub-data parts including data, command data, and end of data, receives the communication data, and the command data in the sub-data part at the head of the communication data part in the communication data is the communication control device. After processing the content of the sub-data part, the control code part is reorganized by the address data included in the next sub-data part, and the other communication control device indicated by the address data is processed. A data control method characterized in that communication data is transferred to.