DTR控制

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;

namespace DTR1060330_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            serialPort1.PortName = "COM1";
            serialPort1.BaudRate = 9600;
            serialPort1.Parity = Parity.None;
            serialPort1.DataBits = 8;
            serialPort1.StopBits = StopBits.One;
            button2.Enabled = false;
            button3.Enabled = false;
            button4.Enabled = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            button2.Enabled = true;
            button3.Enabled = true;
            button4.Enabled = true;
            serialPort1.Open();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            serialPort1.DtrEnable = true;
            button3.Enabled = false;
            button4.Enabled = true;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            serialPort1.DtrEnable = false;
            button4.Enabled = false;
            button3.Enabled = true;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            button1.Enabled = true;
            button2.Enabled = false;
            button3.Enabled = false;
            button4.Enabled = false;
            serialPort1.Close();
        }
    }
}