Electronic identification system

Details Electronic identification system Electronic identification system

1996-03-19

1998-05-12

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

455 311, 455 371, 340505, 340573, 340571, 340572, H04Q 522, H04Q 700, G08B 2600, G08B 2300

Patent

active

057512230

ABSTRACT:
An electronic identification system e.g. for identifying goods in a retail store, comprises an interrogator and a number of transponders. Each transponder includes a number of data registers, and a counter for selecting the registers one at a time in sequence. When the transponder receives an interrogation signal from the interrogator, it returns a response signal containing data from the currently selected register. When the transponder receives a switch signal from the interrogator, it steps the counter on to select the next register in the sequence. One of the bits in the selected register may be used as a mode switching bit, for switching the response signal between a normal power level and a reduced power level.

REFERENCES:
patent: 4839642 (1989-06-01), Batz et al.
patent: 5103222 (1992-04-01), Hogen Esch et al.
patent: 5124699 (1992-06-01), Tervoert et al.
patent: 5235326 (1993-08-01), Beigel et al.
patent: 5367303 (1994-11-01), Waltz
patent: 5517194 (1996-05-01), Carroll et al.
patent: 5537105 (1996-07-01), Marsh et al.

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