当CPU识别3程序器断开连接时，CPU重新设置RTU从通讯，除非在次期间一个新的协议被配置完成。这种情况下，CPU安装新的协议代替。例子1.端口1正以9600波特运行RTU从协议。2.-一个程序器被放在端口1,程序器使用9600波特。3.CPU在端口1.上安装RTU从协议，程序器正常通讯。4.程序器把–个新的配置存储进端口1。新的配置为SNP从设置端口4800波特。(在端口与程序器失去通讯之前不生效)5.当CPU与程序器失去通讯时，新配置生效。

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