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

A RS-422, serial bus technology, applied in the field of communication, can solve the problems of limited communication reliability, affecting the dynamic performance of the system, reducing the amount of data unit transmission, etc., to improve the communication speed, improve the communication speed and channel utilization. efficiency, improve reliability

Active Publication Date: 2016-05-11
深圳市锐驰曼科技发展有限公司
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  • Application Information

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.

Method used

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

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specific Embodiment

[0045] The user needs to download 5 sets of parameters and 8 timings from the host computer to the lower computer. After the download is complete, command the lower computer to release the trigger.

[0046] After the user writes the timing and parameters, the host computer adds the first 0xEB, the second frame header 0x90, and the frame label (0x01+current time) to the downloaded first set of parameters in sequence, select the frame type as 0x1A, and write according to the actual situation The parameter length is used to calculate the frame length, and the cyclic redundancy check is performed on the data frame, and the result is used as the data in the frame check, and finally the frame tail 0xFF is added to form a complete data frame. (In this example, the agreement: the first frame header is 0xEB, the second frame header is 0x90, the frame tail is 0xFF, and the frame types corresponding to parameters, timing, and instructions are 0x1A, 0x2B, and 0x3C.) Then use the same The...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42
CPCG06F13/4286G06F2213/0002
Inventor 马瑞卿李锐张震韩伟健肖晨曦
Owner 深圳市锐驰曼科技发展有限公司
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