code: public final void setActiveEmiType(final EmiType active) throws KNXPortClosedException, KNXTimeoutException
  	{
  		final HidReport r = HidReport.createFeatureService(BusAccessServerService.Set,
  				BusAccessServerFeature.ActiveEmiType, new byte[] { (byte) active.emi.id() });
  		send(r, true);
  	}
docs: Sets the active EMI type for communication. Before setting an active EMI type, the supported EMI types should be
  checked using {@link #getSupportedEmiTypes()}. If only one EMI type is supported, KNX USB device support for this
  method is optional.
  
  @param active the EMI type to activate for communication
  @throws KNXPortClosedException on closed port
  @throws KNXTimeoutException on response timeout