Method for selecting an electronic module from a plurality...

G - Physics – 06 – F

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G06F 13/14 (2006.01) G06F 13/366 (2006.01) G06K 7/00 (2006.01)

Patent

CA 2253627

The invention concerns a method for selecting an electronic module from a plurality of at least two modules (M1, M2, M3) capable of emitting messages simultaneously, comprising steps consisting in sending a general query message (ACTIVALL) to the modules, and selecting (AFI, SELECT-ID) the module having responded first, the modules being designed, on receiving a query message (ACTIVALL, ACTIV), to determine a random time interval (P) and send a responding message (ID, R) when the said time interval (P) has elapsed. A module is set in idle position (IDL) when it receives a message (MESS) before the time interval (P) preceding the sending of a response (ID, R) has elapsed. The idle position (IDL) is at least characterised by the fact that one module does not respond, subsequently, to a complementary query message (ACTIV). This invention is particularly useful for contactless smart card readers and for terminals for electronic labels.

Procédé pour sélectionner un module électronique parmi une pluralité d'au moins deux modules (M1, M2, M3) susceptibles d'émettre des messages simultanément, comprenant les étapes consistant à envoyer un message d'interrogation générale (ACTIVALL) aux modules, et sélectionner (AFI, SELECT-ID) le module ayant répondu le premier, les modules étant agencés pour, sur réception d'un message d'interrogation (ACTIVALL, ACTIV), déterminer un intervalle de temps aléatoire (P) et envoyer un message de réponse (ID, R) quand ledit intervalle de temps (P) est écoulé. Un module se place dans un état de veille (IDL) quand il reçoit un message (MESS) avant que l'intervalle de temps (P) précédant l'envoi d'une réponse (ID, R) ne soit écoulé. L'état de veille (IDL) est au moins caractérisé par le fait qu'un module ne répond pas, par la suite, à un message d'interrogation complémentaire (ACTIV). Application notamment aux lecteurs de cartes à puce sans contact et aux terminaux pour étiquettes électroniques.

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