Patent ID: 6483426
Filing Date: 2002-11-19
Classification: G06K,G07C

Abstract:
A method of identifying a set of transponders situated in the field of an analysis apparatus, each transponder having a different identity code in memory, the method comprising:a) causing the analysis apparatus to transmit data for comparison with a portion of the identity code as selected by the analysis apparatus, said portion comprising a byte; b) causing each as-yet unidentified transponder to compare the received data and the portion of its identity code as selected by the analysis apparatus; c) causing each as-yet unidentified transponder to transmit in at least one time window selected from a set of time windows common to the set of transponders as a function of the result of said comparison; and d) causing the analysis apparatus to analyze the data transmitted by the transponders in said set of time windows, and when the data transmitted by the transponders does not enable a transponder identity code to be determined, at least in part, causing the apparatus to start again with data that has been modified in such a manner that, within a finite number of iterations, the transponders are caused to transmit data enabling the identity code of at least one of the transponders to be determined, at least in part.