System and method for initiating communications between a contro

Details System and method for initiating communications between a contro System and method for initiating communications between a contro

1994-06-07

1995-07-18

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Unique identity

342 51, G01S 1376

Patent

active

054345723

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.

REFERENCES:
patent: 4381562 (1983-04-01), Acampora
patent: 4388690 (1983-06-01), Lumsden
patent: 4963887 (1990-10-01), Kawashima et al.
patent: 5144314 (1992-09-01), Malmberg et al.
patent: 5245332 (1993-09-01), Katzenstein
patent: 5287112 (1994-02-01), Schuermann
patent: 5311185 (1994-05-01), Hochstein et al.
patent: 5347280 (1994-09-01), Schuermann
patent: 5374930 (1994-12-01), Schuermann

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