Multi slave modbus serial simulator in C# winforms

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C#4.0

Hi,
I'm trying to create a .net c# winforms application , to interact with a master device over serial port. The application should simulate 3 slaves, by responding to the master device requests.
I'm trying to use NModbus, but i'm lost on how to use it for multiple slaves.
Please help.

Thanks,
Vidya

What I have tried:

using (SerialPort slavePort = new SerialPort(selectedPort))
           {
               // configure serial port
               slavePort.BaudRate = 19200;
               slavePort.DataBits = 8;
               slavePort.Parity = Parity.Even;
               slavePort.StopBits = StopBits.One;
               slavePort.Open();

               //Create an instance of the ModbusFactory
               IModbusFactory factory = new ModbusFactory();

               //Create an adapter for the serial port
               var adapter = new SerialPortAdapter(slavePort);

               //Create the slave network
               IModbusSlaveNetwork modbusSlaveNetwork = factory.CreateRtuSlaveNetwork(adapter);

               //Create the slaves
               IModbusSlave slave1 = factory.CreateSlave(1);
               IModbusSlave slave2 = factory.CreateSlave(2);
               IModbusSlave slave31 = factory.CreateSlave(31);
            // need to figure how to use datastore

               //Add the slaves to the network
               modbusSlaveNetwork.AddSlave(slave1);
               modbusSlaveNetwork.AddSlave(slave2);
               modbusSlaveNetwork.AddSlave(slave31);

               await modbusSlaveNetwork.ListenAsync();

               await Task.Delay(1);

               //how to capture the request from the master?
           }