C#串口使用的例子

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;
namespace BusApp
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.GroupBox groupBox1;
  private System.Windows.Forms.Label label3;
  private System.Windows.Forms.Label label4;
  private System.Windows.Forms.Label label5;
  private System.Windows.Forms.Label label6;
  private System.Windows.Forms.Button button2;
  private System.Windows.Forms.Button button3;
  private System.Windows.Forms.Button button4;
  private System.Windows.Forms.TextBox textBox8;
  private System.Windows.Forms.Label label7;

  public int iPort=1; //1,2,3,4
  public int iRate=9600; //1200,2400,4800,9600
  public byte bSize=8; //8 bits
  public byte bParity=0; // 0-4=no,odd,even,mark,space
  public byte bStopBits=1; // 0,1,2 = 1, 1.5, 2
  public int iTimeout=1000;
  public mycom mycom1=new mycom();
  public byte[] recb;

  private System.Windows.Forms.TextBox msg;
  private System.Windows.Forms.TextBox t_port;
  private System.Windows.Forms.TextBox t_rate;
  private System.Windows.Forms.TextBox t_bytesize;
  private System.Windows.Forms.TextBox t_stopbyte;
  private System.Windows.Forms.TextBox t_parity;
  private System.Windows.Forms.TextBox t_send;
  private System.Windows.Forms.Button button5; //readTimeOut
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   InitializeComponent();
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.msg = new System.Windows.Forms.TextBox();
   this.label1 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.t_send = new System.Windows.Forms.TextBox();
   this.button1 = new System.Windows.Forms.Button();
   this.groupBox1 = new System.Windows.Forms.GroupBox();
   this.button2 = new System.Windows.Forms.Button();
   this.t_port = new System.Windows.Forms.TextBox();
   this.label3 = new System.Windows.Forms.Label();
   this.t_rate = new System.Windows.Forms.TextBox();
   this.label4 = new System.Windows.Forms.Label();
   this.t_bytesize = new System.Windows.Forms.TextBox();
   this.label5 = new System.Windows.Forms.Label();
   this.t_stopbyte = new System.Windows.Forms.TextBox();
   this.label6 = new System.Windows.Forms.Label();
   this.t_parity = new System.Windows.Forms.TextBox();
   this.button3 = new System.Windows.Forms.Button();
   this.button4 = new System.Windows.Forms.Button();
   this.textBox8 = new System.Windows.Forms.TextBox();
   this.label7 = new System.Windows.Forms.Label();
   this.button5 = new System.Windows.Forms.Button();
   this.groupBox1.SuspendLayout();
   this.SuspendLayout();
   //
   // msg
   //
   this.msg.ForeColor = System.Drawing.Color.Green;
   this.msg.Location = new System.Drawing.Point(0, 0);
   this.msg.Multiline = true;
   this.msg.Name = "msg";
   this.msg.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
   this.msg.Size = new System.Drawing.Size(512, 264);
   this.msg.TabIndex = 0;
   this.msg.Text = "";
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(16, 24);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(56, 16);
   this.label1.TabIndex = 1;
   this.label1.Text = "串口号：";
   //
   // label2
   //
   this.label2.ForeColor = System.Drawing.Color.FromArgb(((System.Byte)(192)), ((System.Byte)(64)), ((System.Byte)(0)));
   this.label2.Location = new System.Drawing.Point(8, 280);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(80, 16);
   this.label2.TabIndex = 1;
   this.label2.Text = "设置数据包：";
   //
   // t_send
   //
   this.t_send.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
   this.t_send.ForeColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(128)), ((System.Byte)(0)));
   this.t_send.Location = new System.Drawing.Point(80, 272);
   this.t_send.Name = "t_send";
   this.t_send.Size = new System.Drawing.Size(344, 21);
   this.t_send.TabIndex = 2;
   this.t_send.Text = "";
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(432, 272);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(40, 23);
   this.button1.TabIndex = 3;
   this.button1.Text = "发送";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // groupBox1
   //
   this.groupBox1.Controls.Add(this.button2);
   this.groupBox1.Controls.Add(this.t_port);
   this.groupBox1.Controls.Add(this.label1);
   this.groupBox1.Controls.Add(this.label3);
   this.groupBox1.Controls.Add(this.t_rate);
   this.groupBox1.Controls.Add(this.label4);
   this.groupBox1.Controls.Add(this.t_bytesize);
   this.groupBox1.Controls.Add(this.label5);
   this.groupBox1.Controls.Add(this.t_stopbyte);
   this.groupBox1.Controls.Add(this.label6);
   this.groupBox1.Controls.Add(this.t_parity);
   this.groupBox1.ForeColor = System.Drawing.Color.FromArgb(((System.Byte)(192)), ((System.Byte)(64)), ((System.Byte)(0)));
   this.groupBox1.Location = new System.Drawing.Point(8, 304);
   this.groupBox1.Name = "groupBox1";
   this.groupBox1.Size = new System.Drawing.Size(176, 216);
   this.groupBox1.TabIndex = 4;
   this.groupBox1.TabStop = false;
   this.groupBox1.Text = "参数设置";
   //
   // button2
   //
   this.button2.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
   this.button2.Location = new System.Drawing.Point(80, 184);
   this.button2.Name = "button2";
   this.button2.TabIndex = 3;
   this.button2.Text = "应用设置";
   this.button2.Click += new System.EventHandler(this.button2_Click);
   //
   // t_port
   //
   this.t_port.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
   this.t_port.Location = new System.Drawing.Point(80, 16);
   this.t_port.Name = "t_port";
   this.t_port.Size = new System.Drawing.Size(80, 21);
   this.t_port.TabIndex = 2;
   this.t_port.Text = "1";
   //
   // label3
   //
   this.label3.Location = new System.Drawing.Point(16, 58);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(56, 16);
   this.label3.TabIndex = 1;
   this.label3.Text = "波特率：";
   //
   // t_rate
   //
   this.t_rate.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
   this.t_rate.Location = new System.Drawing.Point(80, 50);
   this.t_rate.Name = "t_rate";
   this.t_rate.Size = new System.Drawing.Size(80, 21);
   this.t_rate.TabIndex = 2;
   this.t_rate.Text = "9600";
   //
   // label4
   //
   this.label4.Location = new System.Drawing.Point(16, 92);
   this.label4.Name = "label4";
   this.label4.Size = new System.Drawing.Size(56, 16);
   this.label4.TabIndex = 1;
   this.label4.Text = "数据位：";
   //
   // t_bytesize
   //
   this.t_bytesize.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
   this.t_bytesize.Location = new System.Drawing.Point(80, 84);
   this.t_bytesize.Name = "t_bytesize";
   this.t_bytesize.Size = new System.Drawing.Size(80, 21);
   this.t_bytesize.TabIndex = 2;
   this.t_bytesize.Text = "8";