Sequential and/or random polling system with virtually...

Details Sequential and/or random polling system with virtually... Sequential and/or random polling system with virtually...

G - Physics

08

B

354/234

G08B 26/00 (2006.01) G08B 5/00 (2006.01)

Patent

CA 1277042

SEQUENTIAL AND/OR RANDOM POLLING SYSTEM WITH VIRTUALLY INSTANTANEOUS RESPONSE-TIME ABSTRACT A communication system in which a controller ordinarily poll addressable transponders in a sequential or random manner normally allows the transponders to respond only in their respective assigned time period. Certain of the transponders are connected to allow response in a predefined time segment from those transponders so connected if (1) the transponder is in fact programmed for response during this predefined time segment, and (2) the predefined time segment is now occuring. By providing the predefined time segment at the same position in the response time period of each transponder, a "public time" is provided to allow virtually instantaneous identification and verification of a high priority interrupt (such as a holdup alarm). In addition the transponders programmed to respond during public time on a high priority basis can be subdivided into separate groups, and the groups can be identified at the controller.

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