code: public void activateBusmonitor() throws IOException
  	{
  		logger.debug("activate TP-UART busmonitor");
  		os.write(ActivateBusmon);
  		busmonSequence = 0;
  		busmon = true;
  	}
docs: Activate busmonitor mode, the TP-UART controller is set completely passive.
  
  @throws IOException on I/O error