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Selectively addressing RFID transponders

[Category : - Telecommunications]
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A method of selectively addressing one or more transponders 2 in a set of transponders 17 is described. The method comprises transmitting a first set of one or more commands 25, selected to be not executable by a first subset of transponders 24 or to be executable in a shorter time by the first subset of transponders 24 than by a second subset of transponders 23 in the set 17; and, transmitting a second set of one or more commands 26, such that the second set of commands are received by the transponders 2 while the second subset of transponders 23 are still executing the first set of commands 25. In another embodiment, the method comprises transmitting timestamps at intervals for receipt and storage by transponders as they join the set of transponders; and transmitting a set of one or more commands for execution by a subset of transponders identified by a range, or list of timestamps specified in the set commands.

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