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如何通过NMudbus读取寄存器数据

article 2025/2/28 15:43:43

读取ModbusTCP数据

封装ModbusTcp类

public class ModbusTCP
    {
        private ModbusFactory modbusFactory;
        private IModbusMaster master;
        private TcpClient tcpClient;

        public string IPAdress { get; set; }
        public int Port { get; set; }

        public bool Connected
        {
            get => tcpClient.Connected;
        }

        public ModbusTCP(string ip, int port)
        {
            IPAdress = ip;
            Port = port;

            modbusFactory = new ModbusFactory();
            tcpClient = new TcpClient(IPAdress, Port);
            master = modbusFactory.CreateMaster(tcpClient);
            master.Transport.ReadTimeout = 5000;
            master.Transport.Retries = 10;
        }


        public bool[] ReadCoils(byte slaveAddress, ushort startAddress, ushort num)
        {
            return master.ReadCoils(slaveAddress, startAddress, num);
        }

        public bool[] ReadInputs(byte slaveAddress, ushort startAddress, ushort num)
        {
            return master.ReadInputs(slaveAddress, startAddress, num);
        }

        public ushort[] ReadHoldingRegisters(byte slaveAddress, ushort startAddress, ushort num)
        {
            return master.ReadHoldingRegisters(slaveAddress, startAddress, num);
        }

        public ushort[] ReadInputRegisters(byte slaveAddress, ushort startAddress, ushort num)
        {
            return master.ReadInputRegisters(slaveAddress, startAddress, num);
        }

        public void WriteSingleCoil(byte slaveAddress, ushort startAddress, bool value)
        {
            master.WriteSingleCoil(slaveAddress, startAddress, value);
        }

        public void WriteSingleRegister(byte slaveAddress, ushort startAddress, ushort value)
        {
            master.WriteSingleRegister(slaveAddress, startAddress, value);
        }

        public void WriteMultipleCoils(byte slaveAddress, ushort startAddress, bool[] value)
        {
            master.WriteMultipleCoils(slaveAddress, startAddress, value);
        }

        public void WriteMultipleRegisters(byte slaveAddress, ushort startAddress, ushort[] value)
        {
            master.WriteMultipleRegisters(slaveAddress, startAddress, value);
        }

    }

读取保持寄存器

1.引入DLL类库

2.一定要记得下载NModbus包否则会导致引用DLL不全（因为自定义类库中引用了NModbus）

3.设计如下页面

using NModbus类库;

namespace 测试ModbusTCP类库
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            btnRead.Click += BtnRead_Click;
        }

        private void BtnRead_Click(object? sender, EventArgs e)
        {
            string ipAddress = "127.0.0.1";
            int port = 502;
            byte slaveId = 1;
            ModbusTCP modbusTCP = new ModbusTCP(ipAddress, port);
            ushort[] result = modbusTCP.ReadHoldingRegisters(slaveId, 0, 2);
            MessageBox.Show($"{result[0] << 16 | result[1]}");
        }

       
    }
}