Radio frequency identification system with write broadcast capab

Details Radio frequency identification system with write broadcast capab Radio frequency identification system with write broadcast capab

1996-08-09

1999-08-24

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082569, 340572, 3405723, 3405724, 367 6, 455140, 365192, 342 51, G01S 1375

Patent

active

059429879

ABSTRACT:
A Write Broadcast system and method uses a base station to write sent data associated with no particular destination tag or tags, by radio frequency signal, to all or some selected number (sub group) of tags in a base station field simultaneously. By unselecting the tags that have been successfully written to, and requesting a response from the remaining tags in the field (or sub group), the system determines, by receiving a response to the request, that there are tags in the field (sub group) that were unsuccessfully written to. Another Write Broadcast signal is sent to these tags. The system is useful for quickly (simultaneously) "stamping" information on the tag memory of a large number of tags in the field of the base station.

REFERENCES:
patent: 4691202 (1987-09-01), Denne et al.
patent: 5294931 (1994-03-01), Meier
patent: 5374930 (1994-12-01), Schuermann
patent: 5410315 (1995-04-01), Huber
patent: 5450492 (1995-09-01), Hook et al.
patent: 5550547 (1996-08-01), Chan et al.
patent: 5550548 (1996-08-01), Schuermann
patent: 5673037 (1997-09-01), Cesar et al.

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