Users can program the individual address of a KNX device by using the KNX serial number. Siemens offers selected products with removable labels printed with the unique KNX serial number on. In practical work the installer of a KNX device can fix the label to the device in the installation plan. So later on the ETS expert can program the KNX device without pressing the programming button. Therefore the KNX serial number is labeled as bar-code, it is possible to use a bar-code scanner.