Github simples

Slave

using NModbus;
using System.Net;
using System.Net.Sockets;

Console.Title = "ModbusSlave";


byte slaveId = 1;
int port = 502;
IPAddress address = new IPAddress(new byte[] { 127, 0, 0, 1 });

// 创建并启动TCP从站
TcpListener slaveTcpListener = new TcpListener(address, port);
slaveTcpListener.Start();

var factory = new ModbusFactory();
var network = factory.CreateSlaveNetwork(slaveTcpListener);

IModbusSlave slave = factory.CreateSlave(slaveId);

network.AddSlave(slave);

await network.ListenAsync();



// 创建主站
TcpClient masterTcpClient = new TcpClient(address.ToString(), port);
IModbusMaster master = factory.CreateMaster(masterTcpClient);

ushort startAddress = 7165;
master.WriteMultipleRegisters(1, startAddress,new ushort[] {1,2 });

// 清理
masterTcpClient.Close();
slaveTcpListener.Stop();

// output
// Register 100=0
// Register 101=0
// Register 102=0
// Register 103=0
// Register 104=0

Console.ReadKey(true);

Master

using System.Net.Sockets;
using NModbus;

Console.Title = "ModbusMaster";

using (TcpClient client = new TcpClient("127.0.0.1", 502))
{
    var factory = new ModbusFactory();
    IModbusMaster master = factory.CreateMaster(client);

    byte slaveId = 1;
    ushort startAddress = 7165;
    ushort numInputs = 2;

    //master.WriteMultipleRegisters(slaveId, startAddress, new ushort[] { 1, 2 });
    ushort[] registers = master.ReadHoldingRegisters(slaveId, startAddress, numInputs);

    Console.Write($"{startAddress}: {string.Join(" ",registers)}");
}

Console.ReadKey();