An improved solution for authenticating a user seeking to manage a computer system is provided according to aspects of the invention. These positive thermal coefficient switches are linked to connector leads that in turn are connected to leadstraces embedded in or on the printed circuit board. When receiving a state change notice sent in response to the first control signal, the device controller sends the state change notice to the wireless master. A second signal path of the self-timed interface couples the strobe signal to an interface circuit through a hysteresis-based element.