A connector is moveable between a coupled state and an uncoupled state with respect to a counter connector. Plural contact members of the connector individually contact respective, plural contacts of the counter connector when coupled together. A contact module of the connector has a pair of contacts individually contacting and short circuiting a corresponding pair of respective contacts of the counter connector, in a selected one of the coupled and uncoupled states thereof. The contact module may include a pair of output terminals corresponding to the pair of contacts and a switch, actuated between first and second states in accordance with the coupled and uncoupled states of the connector, a selected one of the coupled and uncoupled states producing short circuiting of the pair of output terminals.