OMControlCs/OMControl/Serial/SerialManager.cs

using System;
using System.IO.Ports;
using System.Text;

public class SerialManager : IDisposable
{
    private SerialPort _serialPort;

    public event Action<string>? DataReceived;

    public bool IsOpen => _serialPort?.IsOpen ?? false;

    public SerialManager(string portName, int baudRate)
    {
        _serialPort = new SerialPort(portName, baudRate)
        {
            Encoding = Encoding.ASCII,
            NewLine = "\n"
        };

        _serialPort.DataReceived += OnDataReceived;
    }

    public void Open()
    {
        if (!_serialPort.IsOpen)
            _serialPort.Open();
    }

    public void Close()
    {
        if (_serialPort.IsOpen)
            _serialPort.Close();
    }

    public void Send(string data)
    {
        if (_serialPort.IsOpen)
            _serialPort.WriteLine(data);
    }

    private void OnDataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        string data = _serialPort.ReadLine();
        DataReceived?.Invoke(data);
    }

    public void Dispose()
    {
        Close();
        _serialPort.Dispose();
    }
}