code: public String asString(ProcessEvent e) throws KNXFormatException
  	{
  		final DPTXlatorString t = new DPTXlatorString(DPTXlatorString.DPT_STRING_8859_1);
  		t.setData(e.getASDU());
  		return t.getValue();
  	}
docs: Returns the ASDU of the received process event as string datapoint value.
  <p>
  The used character set is ISO-8859-1 (Latin 1), with an allowed string length of 14
  characters.
  <p>
  This method has to be invoked manually by the user (either in
  {@link #groupReadResponse(ProcessEvent)} or
  {@link ProcessListener#groupWrite(ProcessEvent)}), depending on the received
  datapoint type.
  
  @param e the process event with the ASDU to translate
  @return the received value of type String
  @throws KNXFormatException on not supported or not available ISO-8859-1 DPT