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介绍了几种实用的微机与单片机联网的通讯接口电路，提出了一种采用ＲＳ－４２２的通讯接口电路，其结构简单，可以方便、可靠、长距离实现多点通信
This paper introduces several kinds of practical communication interface circuits between microcomputer and MCU, and presents a communication interface circuit using RS-422. The structure of the communication interface circuit is simple, and it can be convenient, reliable and long-distance to realize multi-point communication