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   源码介绍

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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 串口通信
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        SerialPort sp = new SerialPort();
        public static string strPortName;
        public static string strBaudRate;
        public static string strDataBits;
        public static string strStopBits;
        bool isOpen = true;
        void sp_DataReceived(object sender,SerialDataReceivedEventArgs e)//定义一个接收数据的函数
        {
            //将byte数据转换成字符串窗口显示
            int count = sp.BytesToRead;
            byte[] RecieveBuf = new byte[count];


        }
            
        private void Form1_Load(object sender, EventArgs e)
        {
            for (int j = 1; j < 10; j  )
            {
                cmbPoint.Items.Add("COM"   j);
            }
            cmbPoint.SelectedIndex = 0;//一开始从下标0开始显示 
            cmbBaudRate.Items.Add(1200);
            cmbBaudRate.Items.Add(2400);
            cmbBaudRate.Items.Add(4800);
            cmbBaudRate.Items.Add(9600);
            cmbBaudRate.Items.Add(19200);
            cmbBaudRate.Items.Add(38400);
            cmbBaudRate.Items.Add(43000);
            cmbBaudRate.Items.Add(56000);
            cmbBaudRate.SelectedIndex = 3;//一开始从下标0开始显示

            cmbDateBits.SelectedIndex = 1;//字符串集合编辑器里面设置

            cmbStopBit.Items.Add(1);
            cmbStopBit.Items.Add(2);
            cmbStopBit.Items.Add(3);
            cmbStopBit.SelectedIndex = 0;

            cmbParity.Items.Add("NULL");
            cmbParity.Items.Add("偶");
            cmbParity.Items.Add("奇");
            cmbParity.SelectedIndex = 0;

            txtRecieve.WordWrap = true;//自动换行
                                      // txtRecieve.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
            txtRecieve.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;



        }

        private void button1_Click(object sender, EventArgs e)
        {
            bool isOpen = false;
            if (isOpen)
            {
                isOpen = false;
                button1.Text = "关闭串口";

                strPortName = cmbPoint.Text;
                strBaudRate = cmbBaudRate.Text;
                strDataBits = cmbDateBits.Text;
                strStopBits = cmbStopBit.Text;

                sp.PortName = strPortName;//设置串口号
                sp.BaudRate = int.Parse(strBaudRate);//设置波特率
                sp.DataBits = int.Parse(strDataBits);//设置数据位
                sp.StopBits = (StopBits)int.Parse(strStopBits);//设置停止位
                sp.ReadTimeout = 1000;//打开延时

                sp.Open();//打开串口
               
                sp.DataReceived  = new SerialDataReceivedEventHandler(sp_DataReceived);

            }
            else
            {
                isOpen = true;
                button1.Text = "打开串口";

                sp.DataReceived -=new SerialDataReceivedEventHandler(sp_DataReceived);
                sp.Close();//关闭串口
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if(sp.IsOpen)//判断串口有没有打开
            {
                if(radioButton1.Checked)//发送字符串
                {
                    byte[] SendBuf = new byte[1024 * 1024];
                    SendBuf = System.Text.Encoding.Default.GetBytes(txtSend.Text);
                    sp.Write(SendBuf, 0, SendBuf.Length);

                }
                //发送16进制
                if(radioButton2.Checked)
                {
                    byte[] d = strToHexByte(txtSend.Text.Trim());
                    sp.Write(d, 0, d.Length);

                }
            }
        }
    }
}