使用NModbus4 讀取串口

　　　　  public static void aget()
        {
            byte[] array = new byte[8];
            using (SerialPort port = new SerialPort("COM3"))
            {
                port.BaudRate = 9600;
                port.DataBits = 8;
                port.Parity = Parity.None;
                port.StopBits = StopBits.One;
                port.Open();
                array[0] = 253;
                array[1] = 3;
                array[2] = 1;
                array[3] = 0;
                array[4] = 0;
                array[5] = 2;
                array[6] = 209;
                array[7] = 203;
                port.Write(array, 0, 8);
                port.ReadTimeout = 1000;
                Thread.Sleep(800);
                if (port.BytesToRead > 0)
                {

                    IModbusSerialMaster master = ModbusSerialMaster.CreateRtu(port);

                    byte slaveId = 1;
                    ushort startAddress = 100;
                    ushort[] registers = new ushort[] { 1, 2, 3 };

                    // write three registers
                    //ushort[] shorts =  master.r(slaveId, 0, 80);

                    while (true)
                    {
                        ushort[] shorts2 = master.ReadHoldingRegisters(slaveId, 0, 5);

                        double sd = double.Parse(shorts2[0].ToString());
                        double wd = double.Parse(shorts2[1].ToString());
                        Console.Clear();
                        Console.ForegroundColor = ConsoleColor.Green;
                        Console.WriteLine("濕度:" + sd / 10 + "%");

                        Console.WriteLine("溫度:" + wd / 10 + "%");
                        Thread.Sleep(1000);
                    }

                }
                //port.BytesToRead
            }
        }

設備信息

精訊暢通的 高精度溫濕度傳感器RS485溫濕度計 大棚防雨水工業級4-20ma

設備的數值

每一秒讀去一次

net core NModbus4 讀取串口設備數值