Reading protocol for transponders of electronic...

Details Reading protocol for transponders of electronic... Reading protocol for transponders of electronic...

2006-03-28

2006-03-28

Horabik, Michael (Department: 2635)

Communications: electrical

Continuously variable indicating

With meter reading

C340S010200

Reexamination Certificate

active

07019664

ABSTRACT:
A method of reading a plurality of transponders14.1to14.n forming part of an electronic radio frequency identification system10comprises the steps of prompting the transponders at38to transmit preambles30only of respective response digital sequences to a reader12. The reader then locks onto the preamble30transmitted by one of the transponders and immediately causes a mute signal38to be broadcast to mute all of the transponders not yet transmitting. The reader then transmits during a first time window42a first command40to cause the one transponder to transmit a remainder of the sequence. Having received and read the remainder, the reader transmits a second command44during a second time window46to cause the one transponder to switch to a sleep mode wherein the one transponder no longer transmits any part of the sequence, and to unmute the muted transponders.

REFERENCES:
patent: 5537105 (1996-07-01), Marsh et al.
patent: 5686902 (1997-11-01), Reis et al.
patent: 5986570 (1999-11-01), Black et al.
patent: 6104279 (2000-08-01), Maletsky
patent: 6661336 (2003-12-01), Atkins et al.
patent: 0 689 151 (1995-12-01), None

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