Serial port communication self-check method

Abstract

The invention discloses a serial port communication self-inspection method, comprising the following steps: a microprocessor sends an instruction according to the type of the serial port to be detected, and selects a corresponding serial port drive unit working mode; the microprocessor controls the serial port through the drive and logic The unit, the serial port expansion chip and the isolation protection circuit send a self-loop control command to the serial port drive unit, so that the serial port drive unit drives the controlled component, so that the data receiving end and the data transmitting end of the serial port drive unit pass through the The controlled components are directly connected; the microprocessor sends test data to the serial port drive unit, and the serial port drive unit returns the received test data directly from the data receiving end to the microprocessor device; the microprocessor compares the test data it receives with the test data it sends to detect where the serial port communication system is faulty, and the present invention can quickly test the serial port communication system without the need for external cables.

Description

technical field [0001] The invention relates to the technical field of communication systems, in particular to a serial port communication self-inspection method. Background technique [0002] In serial communication boards, especially multi-channel serial communication boards, it is very necessary to test whether each channel works well before putting it into use, especially in case of communication failure of the device , how to quickly locate which channel has a problem with sending or receiving is very necessary. At present, most of these boards are tested by communicating with external serial communication devices, such as computers. In the case of many channels, repeated wiring is cumbersome, and human error is prone to occur, especially for different communication modes. RS-232, RS-422, and RS-485 have different wiring methods, and the devices connected to them are also different, so it takes a lot of manpower and material resources to complete this kind of testing. ...

AI Technical Summary

Problems solved by technology

At present, most of these boards are tested by communicating with external serial communication devices, such as computers. In the case of many channels, repeated wiring is cumbersome, and human error is prone to occur, especially for different communication modes. RS-232, RS-422, and RS-485 have different wiring methods, and the devices connected to them are also different, so it takes a lot of manpower and material resources to complete this kind of test work