mycom是串口通信类，在本blog前一篇中有完整代码。
下面是串口通讯测试程序的源代码，将mycom类放在此项目中
可以实现简单的串口通信，希望读者能通过这个程序对串口通信过程有一个初步的了解：

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;

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