The need for socket identification, PCB ID or higher level equipment registration by means of an unsophisticated, reliable device at moderate cost becomes a must for modern logistics. Configuration definition and/or traceability of subassembles and/or complete equipment can be achieved by integrating a 64bit ROM on printed wiring board level: The particularity of the device is its communication via the power supply lines (1 wire protocol) and its operation without stand-by power.