Какие данные приходят на устройство через COM-порт, если отправить «1»?

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;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            serialPort1.WriteLine("1");
        }
        private void button2_Click(object sender, EventArgs e)
        {
            serialPort1.WriteLine("0");
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            string[] myPort;
            myPort = System.IO.Ports.SerialPort.GetPortNames();
            comboBox1.Items.AddRange(myPort);
        }
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (serialPort1.IsOpen == true)
            serialPort1.Close();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            serialPort1.BaudRate = 9600;
            serialPort1.PortName = comboBox1.Text.ToString();
            if (serialPort1.IsOpen == false)
                serialPort1.Open();
        }
        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            serialPort1.PortName = comboBox1.Text.ToString();
        }

    }
}