[C# console]Modbus RTU simple example

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.IO.Ports;

namespace ModbusRTU_Float
{
    class Program
    {
        static void Main(string[] args)
        {
            // Define serial port settings
            string portName = "COM6"; // Modify this with your COM port name
            int baudRate = 38400; // Modify this with your baud rate
            Parity parity = Parity.None;
            int dataBits = 8;
            StopBits stopBits = StopBits.One;

            // Create serial port instance
            SerialPort serialPort = new SerialPort(portName, baudRate, parity, dataBits, stopBits);

            try
            {
                // Open serial port
                serialPort.Open();

                // Define Modbus RTU request (example: read holding register)
                byte[] request = { 0x01, 0x04, 0x00, 0x00, 0x00, 0x31, 0x31, 0xDE };
                //byte[] request = { 0x01, 0x04, 0x00, 0x00, 0x00, 0x64, 0xF1, 0xE1 };


                // Send request
                serialPort.Write(request, 0, request.Length);

                // Wait for response
                System.Threading.Thread.Sleep(100); // Adjust delay as needed

                // Read response
                byte[] response = new byte[serialPort.BytesToRead];
                serialPort.Read(response, 0, response.Length);

                // Process response (example: print received data)
                Console.WriteLine("Response: " + BitConverter.ToString(response));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }
            finally
            {
                // Close serial port
                if (serialPort.IsOpen)
                    serialPort.Close();
            }
        }
    }
}

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