A device for fastening an electronic module on a mounting rail and an electronic module fastened with the device on a mounting rail are provided. A sampling rate is selected in such a way as to avoid an overflow of the intermediate memory and all buffered sensor data is read into a control unit memory at the predetermined sampling rate, the intermediate memory generating a message if no new sensor data is present in the intermediate memory at the time of sampling. The source line sub-layer includes plural source lines and plural second sensing conductor segments. A paper towel tearing member is located adjacent to the funnel outlet of said funnel and the opening of this member is adjustable in order to vary the size of the opening of the dispenser. Upon selection by the author is completed, the selected information is extracted and is reflected in user interface contents. The modified destination address is then applied to the FIB, which is a forwarding table optimized to permit fast lookups, to derive the outbound interface from which the packet is to be forwarded to reach the destination entity.