code: public byte readControl(GroupAddress dst) throws KNXTimeoutException,
  		KNXRemoteException, KNXLinkClosedException, KNXFormatException
  	{
  		final byte[] apdu = readFromGroup(dst, priority, 0, 0);
  		final DPTXlator3BitControlled t =
  			new DPTXlator3BitControlled(DPTXlator3BitControlled.DPT_CONTROL_DIMMING);
  		extractGroupASDU(apdu, t);
  		return t.getValueSigned();
  	}
docs: /* (non-Javadoc)
  @see tuwien.auto.calimero.process.ProcessCommunicator#readControl
  (tuwien.auto.calimero.GroupAddress)