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Embedded serial communication systems are increasingly being used in the transformation of traditional airborne equipment in modern military / civil aviation onboard computer on the extensive use of asynchronous RS422 serial communication bus between airborne equipment complete information interactive, built-in test RS422 circuit (Built-in Test, BIT) technology is an important way to improve the system or device testability and maintainability, through the onboard computer RS422 communication module fault feature analysis, combined with practical applications, given a kind of software and hardware design method of improving the reliability of the RS422 communication module BIT