private void openSerialConnection(String portName)
	{
		
		int baudRate = 19200;
		serialInStream = null;
		serialOutStream = null;
		
		//open our port.
		Debug.d("GCode opening port " + portName);
		Main.setRepRapPresent(false);
		try 
		{
			CommPortIdentifier commId = CommPortIdentifier.getPortIdentifier(portName);
			port = (SerialPort)commId.open(portName, 30000);
		} catch (NoSuchPortException e) {
			Debug.d("Can't open port: " + portName + " - no RepRap attached.");
			return;
		}
		catch (PortInUseException e){
			Debug.e("Port '" + portName + "' is already in use.");
			return;			
		}
		Main.setRepRapPresent(true);		
		//get our baudrate
		try {
			baudRate = Preferences.loadGlobalInt("BaudRate");
		}
		catch (IOException e){}
		
		// Workround for javax.comm bug.
		// See [forum.java.sun.com]
		// FIXME: jvandewiel: is this workaround also needed when using the RXTX library?
		try {
			port.setSerialPortParams(baudRate,
					SerialPort.DATABITS_8,
					SerialPort.STOPBITS_1,
					SerialPort.PARITY_NONE);
		}
		catch (UnsupportedCommOperationException e) {
			Debug.d("An unsupported comms operation was encountered.\n" + e.toString());
			return;		
		}
		
		// Wait for baud rate change to take effect
		try {Thread.sleep(1000);} catch (Exception e) {}

		
		try {
			port.setFlowControlMode(SerialPort.FLOWCONTROL_NONE);
		} catch (Exception e) {
			// Um, Linux USB ports don't do this. What can I do about it?
		}
		
		try {
			port.enableReceiveTimeout(1);
		} catch (UnsupportedCommOperationException e) {
			Debug.d("Read timeouts unsupported on this platform");
		}

		//create our steams
		try {
			OutputStream writeStream = port.getOutputStream();
			serialInStream = port.getInputStream();
			serialOutStream = new PrintStream(writeStream);
		} catch (IOException e) {
			Debug.e("GCodeWriter: Error opening serial port stream.");
			serialInStream = null;
			serialOutStream = null;
			return;		
		}

		//arduino bootloader skip.
		Debug.d("Attempting to initialize Arduino/Sanguino");
        try {Thread.sleep(1000);} catch (Exception e) {}
        for(int i = 0; i < 10; i++)
                serialOutStream.write('0');
        try {Thread.sleep(1000);} catch (Exception e) {}
        
        return;
	}