Modbus协议是工业控制的常用协议，支持多节点通信传输，现广泛应用。

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SimpleModbusMaster SimpleModbusMaster is a Modbus master library that allows ModbusRTU communication via RS232 or RS485 The library has 3 functions namely modbusconfigure modbusconstruct modbusupdate To communicate with a slave you first need to create whats called a packet In commercial PLC software terms this is usually called a block A packet is a struct that contains the relevant information linked to that specific packet The Finite State Machine FSM running in the background scans......