20140041060 | Keypad Device - An example tamper detection mechanism may include an electrical pathway having a closed conductive configuration and being openable to prevent electrical conduction along the electrical pathway, and may further include detection circuitry connected to the electrical pathway and configured to detect a change in the resistance of the electrical pathway. The electrical pathway includes a pair of conductive pads electrically isolated from one another, and also includes a connector which in the closed conductive configuration contacts both conductive pads to form an electrical connection therebetween. The connector is moveable away from the pads to open the electrical connection for tamper detection. The connector has a resistor of predefined resistance which in the closed conductive configuration is included in the electrical pathway. The detection circuitry can distinguish, on the basis of the resistance of the electrical pathway, between connection of the pads by the connector and shorting between the two pads. | 02-06-2014 |