Abstract: An inductive device is provided for the rapid data exchange between two data carriers, more particularly between a fixed station and a movable carrier, usable in industrial process automation systems an automatic tuning circuit is provided for maintaining the frequency of the resonating circuit of the inductive device at a nominal value; the tuning circuit includes a comparator means which compares a signal representative of the frequency of the circuit with a reference value. A tuning means receives from the comparator an error signal so as to cause the frequency of the resonating circuit to return to its nominal value.