monThread.setDaemon(true);
	public synchronized void addEventListener(		SerialPortEventListener lsnr ) throws TooManyListenersException	{		if (debug)			System.out.println("RXTXPort:addEventListener()");		if( SPEventListener != null )			throw new TooManyListenersException();		SPEventListener = lsnr;		if (debug)			System.out.println("RXTXPort:Interrupt=false");		monThreadisInterrupted=false;		monThread = new MonitorThread();		monThread.setDaemon(true);		monThread.start();	}