A method of monitoring and programming a plurality of transponders simultaneously, and apparatus for implementing the method.

摘要

The method involves using an external transmitter to transmit energy (1) to a group of read and write transponders. After a time delay (TRR) the transponders emit identification signals (2-3,4-5) through allocated time windows. An external receiver receives the signals during the first window and determines if there is dispersion. If there is dispersion the supply of transmitted energy is interrupted quickly enough to deactivate all the transponders. Energy transmission is resumed and if no transponder signal dispersion is now detected, a window of reception is used to send groups of data to the transponders which are simultaneously programmed into their memories.