Communications: electrical – Continuously variable indicating – With meter reading
Patent
1996-03-12
1999-01-05
Horabik, Michael
Communications: electrical
Continuously variable indicating
With meter reading
34082549, 340505, 340568, 235375, 235380, 342 44, 342 51, G06F 300, G06F 700
Patent
active
058567887
ABSTRACT:
A method and apparatus for determining the identification number or any other information within a plurality of radiofrequency identification tags within a common field of interrogation utilizes a combination of an isolation state into which the tags may be placed together with bitwise interrogation of the identification number or information followed by selective deactivation. A first bit in the identification number or information is interrogated of all the tags in the field. If any tag responds that the bit is a 1, a 1 is entered into an ID register in a reader and all tags in which a 0 exists in that bit position are deactivated. The process continues until only one tag remains activated. The last activated tag at this point has been completely read and is then placed in an isolated state. The process is begun anew with the remaining nonisolated tags until all tags have been read.
REFERENCES:
patent: 4071908 (1978-01-01), Brophy et al.
patent: 5339073 (1994-08-01), Dodd et al.
patent: 5469142 (1995-11-01), Bergman et al.
patent: 5479416 (1995-12-01), Snodgrass et al.
patent: 5583819 (1996-12-01), Roesner et al.
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Plug and Play ISA Specification by Intel Corp. and Microsoft (c)1993, 1994 (Mar.).
Vertrees Keith
Walter Ronald
Beaulieu Yonel
Dawes Daniel L.
Horabik Michael
Single Chips Systems Corp.
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