做项目、跑现场这么多年，我越来越觉得Modbus是个绕不开的东西。不管你是做PLC、玩单片机、搞上位机，还是维护现场仪表，Modbus通讯协议几乎是无处不在。很多刚入行的朋友一听到"协议"两个 ...
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