System and method for initiating communications between a controller and a selected subset of multiple transponders in a common RF field
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United States of America Patent
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Jul 18, 1995
Grant Date -
N/A
app pub date -
Jun 7, 1994
filing date -
Jun 7, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system and method for initiating communication between a controller and a selected one or other subset of multiple transponders in a common RF field in which each transponder has a unique, (or commonly unique) preprogrammed ID number. The controller transmits a series of commands/questions to the transponders and they either respond, or do not respond, to the controller based on their ID number, with the non-responding transponders entering a reset state. The transponders respond to the controller in such a way that, if multiple transponders respond, the controller can recognize that at least one transponder has responded and, for individual responses, the controller is not required to determine how many transponders have responded. Through use of the communications system and method disclosed, a sequence of controller commands and transponder responses single out a selected individual transponder or group of transponders based upon its particular ID number.
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