Abstract: An electromagnetic communication interface including two units each of which contains a coil and associated circuit means. One of the units also includes a core positioned within the coil of that unit and having a free end which may be inserted into the coil of the other unit. When this is done, a magnetic flux link is provided between the two coils and the two circuit means may communicate with one another. The first unit may be mounted on a vehicle body and the second unit on a sliding door of the vehicle. It may be arranged for the magnetic flux link to be formed when the door is closed. A "door-open" signal, generated, for example, by a passenger pressing a push button on the door, may be transmitted via the magnetic flux link to a door opening mechanism mounted on the vehicle body.