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在现场总线的基础上，介绍了电力监控系统中计算机与 ＰＬＣ和智能仪表的通信和数据处理．详细介绍了数据链路层协议编制方法．
Based on the field bus, the communication and data processing of the computer, PLC and intelligent instrument in the power monitoring system are introduced. Details the method of compiling data link layer protocol.