using System;

using System.IO.Ports;

using System.Net;

using System.Net.Sockets;

using System.Threading;

using System.Threading.Tasks;

using NModbus;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        StartModbusTcpSlave();

    }

    public static void StartModbusTcpSlave()

        {

            int port = 502;

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

​

            // create and start the TCP slave

            TcpListener slaveTcpListener = new TcpListener(address, port);

            slaveTcpListener.Start();

​

            IModbusFactory factory = new ModbusFactory();

​

            IModbusSlaveNetwork network = factory.CreateSlaveNetwork(slaveTcpListener);

​

            IModbusSlave slave1 = factory.CreateSlave(1);

            IModbusSlave slave2 = factory.CreateSlave(2);

​

            network.AddSlave(slave1);

            network.AddSlave(slave2);

​

            network.ListenAsync().GetAwaiter().GetResult();

​

            // prevent the main thread from exiting

            Thread.Sleep(Timeout.Infinite);

        }

}

​

​