An interface for providing an electrical and mechanical connection of a data processing unit to a data communications card. The connections have a plurality of sockets in a predetermined alignment. Contained within the unit is a series of connectors in an alignment corresponding to the predetermined alignment of the sockets so that when the sockets and the connectors respectively engage, predetermined electrical circuits are completed. An actuator is also disposed within the housing for generating an output signal indicative of the orientation of either the sockets or the connectors. A multiplexer circuit is provided to reverse either the sockets or the connectors, when necessary, in response to the output of the actuator.