Patent ID: 7834742

Claim:
A method of inventorying at least one transponder by means of a communication station, wherein the communication station emits an unmodulated carrier signal in a communications range, and wherein the transponder on entering the communications range generates a presence-signaling signal and emits the presence-signaling signal in the communications range, and wherein the communication station on receiving a presence-signaling signal emits an inventorying command signal in the communications range, and wherein the transponder on receiving the inventorying command signal emits a response signal in the communications range permitting the inventorying of the transponders, and wherein the communication station, on correctly receiving a response signal undertakes inventorying of the transponders, wherein the transponder emits the presence-signaling signal with a first signal duration and the response signal with a second signal duration, and wherein the first signal duration is shorter than the second signal duration, wherein the first signal duration and the second signal duration have a ratio of 1:X, and in that the value X lies in a range between X=10 and X=100, wherein the presence-signaling signal is not assigned to the transponder.