C# 串口类SerialPort的使用方法

using System.IO.Ports;

SerialPort com;

private void Form1_Load(object sender, EventArgs e) { com = new SerialPort("COM5"); //实例化SerialPort并设置COM口 com.BaudRate = 115200;//波特率 com.Parity = Parity.None;//无奇偶校验位 com.StopBits = StopBits.Two;//两个停止位 com.Handshake = Handshake.RequestToSend;//控制协议 com.ReceivedBytesThreshold = 13;//设置 DataReceived 事件发生前内部输入缓冲区中的字节数,我这里是13字节为一组 com.Open(); //打开串口  com.DataReceived += new SerialDataReceivedEventHandler(Com_DataReceived); //接受数据线程 }

/// <summary> /// 监听串口数据线程 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void Com_DataReceived(object sender, SerialDataReceivedEventArgs e) { try { if (com.IsOpen) { byte[] readBuffer = new byte[com.ReadBufferSize + 1]; try {  int count = com.Read(readBuffer, 0, com.ReadBufferSize); //读取串口数据(监听) //String SerialIn = System.Text.Encoding.ASCII.GetString(readBuffer, 0, count);  if (count != 0) { //将返回值byte数组转换为string类型数据 String result = bytesToHexString(readBuffer); //这里强调一下,线程里不可以直接对UI进行赋值 this.BeginInvoke(new System.Threading.ThreadStart(delegate () { textBox1.Text = result; //对控件进行赋值  })); } } catch (TimeoutException) { } } else { TimeSpan waitTime = new TimeSpan(0, 0, 0, 0, 50); Thread.Sleep(waitTime); } } catch (Exception ex) { } }

/// <summary> /// Byte数组转换成16进制 /// </summary> /// <param name="bArr"></param> /// <returns></returns> String bytesToHexString(byte[] bArr) { string result = string.Empty; for (int i = 0; i < 13; i++)//逐字节变为16进制字符，以%隔开  { result += Convert.ToString(bArr[i], 16).ToUpper().PadLeft(2, '0') + " "; } return result; }

/// <summary> /// 发送数据 /// </summary> void SendData() { Byte[] TxData = { 1, 2, 3, 4, 5, 6, 7, 8 }; com.Write(TxData, 0, 8); }