A bus has a first set of data lines and a second set of data lines. The fastening means comprises a shank and a load application means, wherein the shank has a free end that is planar and a cylindrical outer contour, such that the driving of the fastening means into the substrate is done with an essentially consistently uniform driving force. In the absence of the signal, the commands and data are sent between the user interface and the console interface bypassing the service processor.