Reliable data transmission method for CAN (control area network)-based measurement and control subsystem

Abstract

The invention relates to the technical field of measurement and control, particularly to a reliable data transmission method for a CAN (control area network)-based measurement and control subsystem, which is built on a CAN and TCP / IP (transmission control protocol / internet protocol) mixed communication structure. The method comprises a structuralized CAN frame identifier of a CAN-based measurement and control subsystem, a CAN-based measurement and control subsystem collision avoidance algorithm and a CAN-based measurement and control subsystem reliable data transmission algorithm. In a measurement and control system based on a CAN and TCP / IP based mixed communication structure, a CAN-based measurement and control subsystem can acquire an ideal real-time performance and the peer-to-peer reliable data transmission between a measurement and control terminal and an Internet remote control terminal can be realized.

Description

technical field [0001] The invention relates to the technical field of measurement and control, in particular to a reliable data transmission method based on a CAN and TCP / IP hybrid communication structure based on a CAN measurement and control subsystem. Background technique [0002] The development trend of the measurement and control system is to use the enterprise LAN to manage the measurement and control subsystem, and connect to the Internet through the gateway to realize the remote measurement and control function. The measurement and control subsystem has high requirements for anti-interference performance and real-time communication performance, and the single communication volume is small, and the communication distance is usually within 10km. If the measurement and control subsystem directly adopts Ethernet networking, the application layer data of the measurement and control terminal will have to be encapsulated by the TCP / IP protocol stack, and the measurement a...

AI Technical Summary

Problems solved by technology

[0008] When the measurement and control terminal number is carried on the CAN frame identifier, the CAN frame identifier does not reflect the priority information required for bus medium access control, and the result of the priority bit-by-bit arbitration is inaccurate. The real-time performance of the measurement and control subsystem will drop sharply. Therefore, it is necessary to avoid conflicts as much as possible and reduce the possibility of failure in priority bit-by-bit arbitration.

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