public class RevSerialPort
    {
        SerialPort serialPort;
        StringBuilder sb;
        public RevSerialPort()
        {
            sb = new StringBuilder();
            serialPort = new SerialPort();
            serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
        }

        public RevSerialPort(string portName)
        {
            sb = new StringBuilder();
            serialPort = new SerialPort(portName);
            serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
        }

        public RevSerialPort(string portName, int baudRate, Parity parity, int dataBits, StopBits stopBits)
        {
            sb = new StringBuilder();
            serialPort = new SerialPort(portName, baudRate, parity, dataBits, stopBits);
            serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
        }

        void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            sb.Append(serialPort.ReadExisting());
            int index = sb.ToString().IndexOf((char)0xd);
            if (index > 0)
            {
                try
                {
                    System.Windows.Forms.SendKeys.SendWait(sb.ToString(0, index) + "~");
                }
                finally
                {
                    sb.Remove(0, index + 1);
                }
            }
        }

        public void Start()
        {
            serialPort.Open();
        }

        public void Stop()
        {
            if (serialPort.IsOpen)
                serialPort.Close();
        }
    }