code: public String getProperty(final int objIndex, final int pid) throws KNXException,
  		InterruptedException
  	{
  		return getPropertyTranslated(objIndex, pid, 1, 1).getValue();
  	}
docs: Gets the first property element using the associated property data type of the
  requested property.
  
  @param objIndex interface object index in the device
  @param pid property identifier
  @return property element value represented as string
  @throws KNXException on adapter errors while querying the property element or data
  type translation problems
  @throws InterruptedException on thread interrupt