#region Constructor
public frmTerminal()
{

...

// When data is recieved through the port, call this method
comport.Encoding = System.Text.Encoding.Default;
comport.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
}
#endregion
...
private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
      // This method will be called when there is data waiting in the port's buffer

      // Determain which mode (string or binary) the user is in
      if (CurrentDataMode == DataMode.Text)
      {
        // Read all the data waiting in the buffer
        string data = comport.ReadExisting();

        // Display the text to the user in the terminal
        Log(LogMsgType.Incoming, data);
      }
      else
      {
        // Obtain the number of bytes waiting in the port's buffer
        int bytes = comport.BytesToRead;

        // Create a byte array buffer to hold the incoming data
        byte[] buffer = new byte[bytes];

        // Read the data from the port and store it in our buffer
        comport.Read(buffer, 0, bytes);

        // Show the user the incoming data in hex format
        Log(LogMsgType.Incoming, ByteArrayToHexString(buffer));
      }
    }