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文章介绍了直接利用ＲＳ－２３２Ｃ串行通讯口实现ＰＣ系列机间一点对多点的双向通讯，给出了实现该系统的接口线路，并介绍了通讯软件的编制。
This paper introduces the direct use of RS-232C serial communication port to achieve a point-to-multipoint two-way communication between PC series, gives the interface of the system, and introduces the compilation of communication software.