C# EasyModbus xktComm Modbus 例子

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当然先要在NuGet按照相应的dll

            //不是ModbusRTU报文，在RTU报文前面加了4个字节，transactionIdentifier，protocolIdentifier，00 01 00 00 00 06 01 03 00 64 00 02
            EasyModbus.ModbusClient modbusClient = new ModbusClient("127.0.0.1",502);
            modbusClient.NumberOfRetries = 3;//重试次数
            modbusClient.UnitIdentifier = 2;//站号
            modbusClient.Connect();
            int[] intValue = modbusClient.ReadHoldingRegisters(100,2);//读保持寄存器，相当于功能码03，长度为1代表读2个字节，1个字
            modbusClient.Disconnect();
            float floatResult = ModbusClient.ConvertRegistersToFloat(intValue,0);//0为LowHigh 1为HighLow
            textBox1.Text = floatResult.ToString();

以下用的库是xktComm

            xktComm.ModbusRtuOverTCP modbusRtuOverTCP = new xktComm.ModbusRtuOverTCP();
            modbusRtuOverTCP.ConnectTimeOut = 500;
            bool connect= modbusRtuOverTCP.Connect("127.0.0.1","502");
            byte[] resultByte=modbusRtuOverTCP.ReadKeepReg(1,100,1);//序列是RTU，不是TCP，如01 03 00 64 00 01 C5 D5
            byte[] resultReverse = new byte[2]
            {
                resultByte[1],
                resultByte[0]
            };
            int result = BitConverter.ToUInt16(resultReverse, 0);
            modbusRtuOverTCP.DisConnect();
            textBox2.Text = result.ToString();