Reliable data interaction method based on RS-422 serial bus technique

Abstract

The invention relates to a reliable data interaction method based on an RS-422 serial bus technique, and with the combination of continuous auto repeat request (Auto Repeat request ARQ) protocol, discloses a novel data interaction and verification method based on the RS-422 serial bus technique. A host computer and a lower computer have a response mechanism and repeat frame verification, and moreover the host computer can continuously transmit a plurality of data frames before receiving a response frame transmitted from the lower computer, copies of the data frames can be stored in transmitting buffer when the data frames are transmitted, and corresponding data frame copies in the buffer can be deleted after the host computer receives the response frame. Until a certain number of data frames which do not receive the response frames are accumulated, the host computer stops to retransmit the data frame copies in the buffer. The utilization rate and the communication speed of a channel can be greatly increased. Aiming at the characteristics of an embedded system, information type recognition codes are added into the data frames for communication of the host computer and the lower computer, so that communication of multiple time sequences, parameters and task instructions of the embedded system can be achieved simultaneously.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a reliable data interaction method based on RS-422 serial bus technology. Background technique [0002] In an embedded system, the target system waiting for debugging or receiving data is usually called the lower computer, and the corresponding target system for debugging or sending data is called the upper computer. The upper computer realizes the control of the lower computer through communication. [0003] Embedded systems are widely used in the field of aerospace. The upper computer and the lower computer in the aerospace field generally communicate through the RS-422 serial bus technology, and perform data transmission through the buffer of the general asynchronous receiving / sending device. The buffer structure of the general asynchronous receiving / sending device adopts a first-in-first-out queue FirstInputFirstOutput, FIFO) implementation. When transmitting data, a...

AI Technical Summary

Problems solved by technology

However, a lower baud rate will reduce the amount of data unit transmission, which will affect the overall dynamic performance of the system, and this approach has a limited effect on improving communication reliability.

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