Access control installation including an access side's control device and a user identification device having transceivers for bi-directional communication

The entry system (10) includes a control device (14) in the vehicle and an identification device (16) carried by a driver. A transceiver (18) is arranged next to the control device (14) for wireless communication with another transceiver (20) located in the ID device (16). The first transceiver (18) comprises at least one transmitting antenna (22-26), which encompasses corresponding electric coils (22'-26') for generating magnetic field. Each coil is a closed loop.