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   源码介绍

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 private void initSerialPort()
        {
            try
            {
                // serialPort = new SerialPort(ConfigurationManager.AppSettings["ComPort"].ToString());
                serialPort = new SerialPort("COM1");
                serialPort.BaudRate = 9600;
                serialPort.Parity = Parity.None;
                serialPort.StopBits = StopBits.One;
                serialPort.DataBits = 8;
                serialPort.Handshake = Handshake.None;
                //serialPort.ReadTimeout = 3000;
                serialPort.ReceivedBytesThreshold = 1;
                serialPort.DataReceived = new SerialDataReceivedEventHandler(DataReceived);
                if (serialPort.IsOpen)
                {
                    serialPort.Close();
                }
                serialPort.Open();
                //isInitPort = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("加载接口实例失败！");
            }
        }
 /// <summary>
        /// 监听串口数据线程
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            Thread.Sleep(500);//线程休眠500毫秒，方便接收串口的全部数据
            try
            {
                if (serialPort.IsOpen)
                {
                    byte[] readBuffer = new byte[serialPort.ReadBufferSize 1];
                    try
                    {
                        int count = serialPort.Read(readBuffer, 0, serialPort.ReadBufferSize);        //读取串口数据(监听)
                        String SerialIn = System.Text.Encoding.ASCII.GetString(readBuffer, 0, count);//将字节数组解码为字符串
                        if (count != 0)
                        {
                            //这里强调一下,线程里不可以直接对UI进行赋值，只能使用委托操作控件
                            this.BeginInvoke(new System.Threading.ThreadStart(delegate ()
                            {
                                richTextBox1.Text = "秤参数： " SerialIn;
                            }));

                        }
                    }
                    catch (TimeoutException) { }
                }
                else
                {
                    TimeSpan waitTime = new TimeSpan(0, 0, 0, 0, 50);
                    Thread.Sleep(waitTime);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }