Synchronization for a system comprising a plurality of...

H - Electricity – 04 – B

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H04B 1/59 (2006.01) G06K 7/10 (2006.01)

Patent

CA 2388302

A system comprising multiple reading devices which are arranged for wireless readout of at least two different types of transponders, each reading device being arranged for generating, in use, a time-repetitive electromagnetic interrogation transmission pulse. The pulse duration has a predetermined first value (.DELTA.T) and the quiescent period between two successive interrogation transmission pulses has a predetermined second value .DELTA.R when the reading device does not receive a response. The first value of the reading device is prolonged when the reading device receives a response from at least one transponder of a first type, and the second value of the reading device is prolonged when the reading device, in between the transmission of two interrogation transmission pulses, receives a response from at least one transponder of a second type. The reading devices are connected with each other through a synchronization connection.

L'invention concerne un système comprenant des dispositifs de lecture multiples conçus pour une lecture sans fil d'au moins deux types de transpondeurs différents, chaque dispositif de lecture étant conçu pour créer, en utilisation, une impulsion de transmission d'interrogation électromagnétique répétitive dans le temps. La durée de l'impulsion possède une première valeur prédéterminée ( DELTA T), et la période quiescente entre deux impulsions de transmission d'interrogation successives possède une deuxième valeur prédéterminée DELTA R lorsque le dispositif de lecture ne reçoit pas de réponse. La première valeur du dispositif de lecture est prolongée lorsque le dispositif de lecture reçoit une réponse d'au moins un transpondeur d'un premier type, et la deuxième valeur du dispositif de lecture est prolongée lorsque le dispositif de lecture, entre la transmission de deux impulsions de transmission d'interrogation, reçoit une réponse d'au moins un transpondeur d'un deuxième type. Les dispositifs de lecture sont connectés les uns aux autres par l'intermédiaire d'une connexion de synchronisation.

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