FluentModbus 1.2.0

FluentModbus is a .NET Standard library that provides a Modbus TCP server and client implementation for easy process data exchange. Support for Modbus RTU and ASCII mode is planned for the next major version. Both, the server and the client, implement class 0 and class 1 functions of the specification. Namely, these are:

Class 0:

• FC03: ReadHoldingRegisters
• FC16: WriteMultipleRegisters

Class 1:

• FC01: ReadCoils
• FC02: ReadDiscreteInputs
• FC04: ReadInputRegisters
• FC05: WriteSingleCoil
• FC06: WriteSingleRegister

Please see the introduction and the sample application, to get started with FluentModbus.

Quick start

Client

var unitIdentifier = (byte)0xFF;
var startingAddress = (ushort)0;
var count = (ushort)10;
var client = new ModbusTcpClient();
var endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 502);

client.Connect(endPoint)

// read data
var shortData = client.ReadHoldingRegisters<short>(unitIdentifier, startingAddress, count);

// write data
var intData = new int[] { 4263, 4554 };
client.WriteMultipleRegisters(unitIdentifier, startingAddress, intData);

Server

var cts = new CancellationTokenSource();
var random = new Random();
var server = new ModbusTcpServer();

server.Start();

while (!cts.IsCancellationRequested)
{
    var intData = server.GetHoldingRegisterBuffer<int>();

    // lock is required to synchronize buffer access between
    // this application and one or more Modbus clients
    lock (server.Lock)
    {
        intData[20] = random.Next(0, 100);
    }

    // update server buffer content only once per second
    Thread.Sleep(TimeSpan.FromSeconds(1));
}

server.Dispose();