Self-checking serial communication system and self-checking method thereof

The invention discloses a self-checking serial communication system and a self-checking method thereof. The serial communication system comprises a microprocessor, a drive and logic control unit, a seThe invention discloses a self-checking serial communication system and a self-checking method thereof. The serial communication system comprises a microprocessor, a drive and logic control unit, a serial extension chip, an insulation protection circuit and a serial drive unit, wherein the serial drive unit is provided with a data receiving terminal, a data sending terminal and a controlled part crial extension chip, an insulation protection circuit and a serial drive unit, wherein the serial drive unit is provided with a data receiving terminal, a data sending terminal and a controlled part connecting the data receiving terminal with the data sending terminal. The self-checking method comprises controlling the controlled part by the microprocessor to send and receive data after the data ronnecting the data receiving terminal with the data sending terminal. The self-checking method comprises controlling the controlled part by the microprocessor to send and receive data after the data receiving terminal and the data sending terminal of the serial drive unit are connected; and comparing the testing data received by the serial drive unit with the testing data sent by the unit to realieceiving terminal and the data sending terminal of the serial drive unit are connected; and comparing the testing data received by the serial drive unit with the testing data sent by the unit to realize self checking of failures of the serial communication system. The system and the method for checking the serial communication system provided by the invention can realize reliable and quick testingze self checking of failures of the serial communication system. The system and the method for checking the serial communication system provided by the invention can realize reliable and quick testingof the serial communication system without adopting an external cable. of the serial communication system without adopting an external cable.