C# 使用NModbus4、EasyModbus进行串口ModbusRTU数据收发，立即获取返回响应

一、先介绍NModbus4，NuGet安装NModbus4稳定版v2.1.0

1.新建类NModbus4Helper.cs

添加命名空间

using Modbus.Device;
using Modbus.Message;

        byte _DeviceId = 8;
        ModbusMaster master;

1.  
   /// <summary>
2.  
   /// 读取单个寄存器
3.  
   /// </summary>
4.  
   /// <param name="regAddr"></param>
5.  
   /// <param name="value"></param>
6.  
   /// <returns></returns>
7.  
   public byte[] ReadSingleRegister(ushort regAddr)
8.  
   {
9.  
   try
10.  
    {
11.  
    ReadHoldingInputRegistersRequest readRegistersReq = new ReadHoldingInputRegistersRequest(0x03, _DeviceId, regAddr, 1);
12.  
    //获取响应报文
13.  
    ReadHoldingInputRegistersResponse readRegistersRes = master.ExecuteCustomMessage<ReadHoldingInputRegistersResponse>(readRegistersReq);
14.  
    return readRegistersRes.ProtocolDataUnit;
15.  
    }
16.  
    catch (Exception ex)
17.  
    {
18.  
    return null;
19.  
    }
20.  
    }

1.  
   /// <summary>
2.  
   /// 读取多个保持型寄存器
3.  
   /// </summary>
4.  
   /// <returns></returns>
5.  
   public Task<byte[]> ReadHoldingRegisters(ushort regStartAddr, ushort regEndAddr)
6.  
   {
7.  
   try
8.  
   {
9.  
   ushort Lenth = (ushort)(regEndAddr - regStartAddr 1);
10.  
    return Task.Run(() =>
11.  
    {
12.  
    ReadHoldingInputRegistersRequest readRegistersReq = new ReadHoldingInputRegistersRequest(0x03, _DeviceId, regStartAddr, Lenth);
13.  
    //获取响应报文
14.  
    ReadHoldingInputRegistersResponse readRegistersRes = master.ExecuteCustomMessage<ReadHoldingInputRegistersResponse>(readRegistersReq);
15.  
    return readRegistersRes.ProtocolDataUnit;
16.  
    });
17.  
    }
18.  
    catch (Exception ex)
19.  
    {
20.  
    return null;
21.  
    }
22.  
    }

1.  
   public byte[] ReadRegister(ushort regAddr)
2.  
   {
3.  
   try
4.  
   {
5.  
   ushort Lenth = 1;
6.  
   ushort[] rec = master.ReadHoldingRegisters(_DeviceId, regAddr, Lenth);
7.  
   byte[] recByte = new byte[rec.Length];
8.  
   Buffer.BlockCopy(rec, 0, recByte, 0, rec.Length);
9.  
   return recByte;
10.  
    }
11.  
    catch (Exception ex)
12.  
    {
13.  
    return null;
14.  
    }
15.  
    }
16.  
     
17.  
    public byte[] ReadRegisters(ushort regStartAddr, ushort regEndAddr)
18.  
    {
19.  
    try
20.  
    {
21.  
    ushort Lenth = (ushort)(regEndAddr - regStartAddr 1);
22.  
    ushort[] rec = master.ReadHoldingRegisters(_DeviceId, regStartAddr, Lenth);
23.  
    byte[] recByte = new byte[rec.Length];
24.  
    Buffer.BlockCopy(rec, 0, recByte, 0, rec.Length);
25.  
    return recByte;
26.  
    }
27.  
    catch (Exception ex)
28.  
    {
29.  
    return null;
30.  
    }
31.  
    }

二、使用EasyModbus，NuGet安装EasyModbusTCP 5.6.0

添加命名空间using EasyModbus;

1.  
   byte _DeviceId = 8;
2.  
   ModbusClient modbusClient = null;
3.  
   object _transferLockObj = new object();
4.  
    
5.  
   public void OpenSerialPort()
6.  
   {
7.  
   try
8.  
   {
9.  
   modbusClient = new ModbusClient("COM1");
10.  
    modbusClient.UnitIdentifier = _DeviceId;
11.  
    modbusClient.Baudrate = _baudRate;
12.  
    modbusClient.Parity = Parity.None;
13.  
    modbusClient.StopBits = StopBits.One;
14.  
    modbusClient.ConnectionTimeout = 500;
15.  
    modbusClient.Connect();
16.  
    }
17.  
    catch (Exception ex)
18.  
    {
19.  
    }
20.  
    }
21.  
     
22.  
    /// <summary>
23.  
    /// 写入单个寄存器并获取响应
24.  
    /// </summary>
25.  
    public byte[] WriteSingleRegister(ushort regAddr, ushort value)
26.  
    {
27.  
    try
28.  
    {
29.  
    lock (_transferLockObj)
30.  
    {
31.  
    modbusClient.receiveData = null;
32.  
    modbusClient.WriteSingleRegister(regAddr, value);
33.  
    byte[] Rec = modbusClient.receiveData;
34.  
    return Rec;
35.  
    }
36.  
    }
37.  
    catch (Exception ex)
38.  
    {
39.  
    return null;
40.  
    }
41.  
    }
42.  
     
43.  
    /// <summary>
44.  
    /// 读取寄存器
45.  
    /// </summary>
46.  
    public int[] ReadRegisters(ushort regStartAddr, ushort regEndAddr)
47.  
    {
48.  
    try
49.  
    {
50.  
    lock (_transferLockObj)
51.  
    {
52.  
    ushort Lenth = (ushort)(regEndAddr - regStartAddr 1);
53.  
    int[] rec = modbusClient.ReadHoldingRegisters(regStartAddr, Lenth);
54.  
    return rec;
55.  
    }
56.  
    }
57.  
    catch (Exception ex)
58.  
    {
59.  
    return null;
60.  
    }
61.  
    }

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