A high reliability rs422 serial port communication circuit device

Abstract

The present invention is a highly reliable RS422 serial port communication circuit device. When information is transmitted, one side of machine A sends signals to the main RS422 transmission circuit of machine A, the backup RS422 transmission circuit of machine A, and the main RS422 receiving circuit of machine B on the side of machine B. The backup RS422 receiving circuit of machine B receives at the same time, after receiving, the RS422 differential signal is converted into a CMOS / TTL level signal and input to the rear stage at the same time, and connected to the main CPU circuit of machine B or the backup CPU circuit of machine B; the reverse is sent by the side of machine B The signal goes to two communication lines at the same time, and the two communication lines on the side of machine A are received at the same time. After receiving, the RS422 differential signal is converted into a CMOS / TTL level signal and input to the rear stage at the same time, and connected to the main CPU circuit of machine A or the backup CPU of machine A. The circuit completes the complete interaction of the information link and improves the reliability of information transmission.

Description

technical field [0001] The invention relates to a highly reliable RS422 serial port communication circuit device, which belongs to the technical field of bus communication. Background technique [0002] The long-life and high-reliability design of space vehicles has high requirements for large-scale space laboratories on orbit in the future. Bus parameter transmission is required between the upper computer and the lower computer in the sub-system, and the serial communication circuit with high reliability and good adaptability is suitable for The need for the development of communications between individual aircraft within a space vehicle. [0003] RS422 serial communication technology is widely used in the design of aerospace satellites, spaceships and other aircraft. Traditional serial communication circuits have too many discrete components, complex circuit forms and connections, insufficient robustness, large volume, heavy weight, and low reliability. Lightweight, integ...

AI Technical Summary

Problems solved by technology

[0003] RS422 serial communication technology is widely used in the design of aerospace satellites, spaceships and other aircraft. Traditional serial communication circuits have too many discrete components, complex circuit forms and connections, insufficient robustness, large volume, heavy weight, and low reliability. Lightweight, integrated, and highly reliable design requirements; therefore, it is of great significance to study a highly integrated, robust, and highly reliable RS422 serial communication circuit for aerospace

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