Прием по COM HEX данных

_serialPort = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
            _serialPort.Handshake = Handshake.None;
            _serialPort.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
            _serialPort.ReadTimeout = 500;
            _serialPort.WriteTimeout = 500;
            _serialPort.Open();

string data = _serialPort.ReadLine();

int l = _serialPort.ReadByte();

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;
 
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
          
        }
        SerialPort _serialPort;
 
        // delegate is used to write to a UI control from a non-UI thread
        private delegate void SetTextDeleg(string text);
 
        private void Form1_Load(object sender, EventArgs e)
        {
            // all of the options for a serial device
            // can be sent through the constructor of the SerialPort class
            // PortName = "COM1", Baud Rate = 19200, Parity = None, 
            // Data Bits = 8, Stop Bits = One, Handshake = None
            _serialPort = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
            _serialPort.Handshake = Handshake.None;
            _serialPort.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
            _serialPort.ReadTimeout = 500;
            _serialPort.WriteTimeout = 500;
            _serialPort.Open();
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            // Makes sure serial port is open before trying to write
            try
            {
                if (!_serialPort.IsOpen)
                    _serialPort.Open();
 
                _serialPort.Write("SI\r\n");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error opening/writing to serial port :: " + ex.Message, "Error!");
            }
        }
        private delegate void LineReceivedEvent(string POT);
 
        private void LineReceived(string s)
        {
         textBox13.Text = s;
              
        }
        void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            Thread.Sleep(500);
 
            int intBytes = _serialPort.BytesToRead;
            byte[] bytes = new byte[intBytes];
 
          _serialPort.Read(bytes, 0, intBytes);
           string s = BitConverter.ToString(bytes);
           this.BeginInvoke(new LineReceivedEvent(LineReceived), s);
 
           }
    }
}