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文章介绍了一种ＩＢＭＰＣ及其兼容机（以下简称ＰＣ机）与ＭＣＳ－５１之间实用可靠的通讯方法──回送比较法，该方法通讯准确可靠，能有效地克服各种干扰所造成的数据误传输，适合于干扰严重的测控现场使用。
This paper introduces a pragmatic and reliable communication method between IBMPC and its compatible PC (hereinafter referred to as PC) and MCS-51, which is called the loopback comparison method. The method can accurately and reliably communicate and can effectively overcome the data caused by various kinds of interference Error transmission, suitable for serious interference on-site monitoring and control.