Back

MODBUS/TCP Example

---

Author: Admin 12/08/2024
Language: C#
Tags: modbus tcp

---

Description:

The following example shows how to configure a MODBUS/TCP protocol and read values.

Article:

The following example tcpsimple.cpp shows how to configure a MODBUS/TCP protocol and read values

This code uses the FieldTalk Modbus driver/dll. I used this in a SCADA system I built for an Irrigation District.

using System;
using System.Threading;
using FieldTalk.Modbus.Master;


class TcpSimpleApp
{

    MbusTcpMasterProtocol mbusProtocol = new MbusTcpMasterProtocol();


    void openProtocol()
    {
        int result;

        result = mbusProtocol.openProtocol("127.0.0.1");
        if (result != BusProtocolErrors.FTALK_SUCCESS)
        {
            Console.WriteLine("Error opening protocol: " + BusProtocolErrors.getBusProtocolErrorText(result));
            Environment.Exit(result);
        }
    }


    void closeProtocol()
    {
        mbusProtocol.closeProtocol();
    }


    void runPollLoop()
    {
        Int16[] dataArr = new Int16[10];

        for (;;)
        {
            int result;

            result = mbusProtocol.readMultipleRegisters(1, 100, dataArr);
            if (result == BusProtocolErrors.FTALK_SUCCESS)
            {
                  for (int i = 0; i < dataArr.Length; i++)
                     Console.WriteLine("[" + (100 + i) + "]: " + dataArr[i]);
            }
            else
            {
                Console.WriteLine(BusProtocolErrors.getBusProtocolErrorText(result) + "!");
                // Stop for fatal errors
                if ((result & BusProtocolErrors.FTALK_BUS_PROTOCOL_ERROR_CLASS) != BusProtocolErrors.FTALK_BUS_PROTOCOL_ERROR_CLASS)
                    return;
            }
            Thread.Sleep(1000);
        }
    }


    public static void Main()
    {
        TcpSimpleApp app = new TcpSimpleApp();

        app.openProtocol();
        app.runPollLoop();
        app.closeProtocol();
    }
}

Read more here https://www.modbusdriver.com/doc/mbusmaster.net/examples.htm

---

Back