Selective clearing of latched circuits

Details Selective clearing of latched circuits Selective clearing of latched circuits

G - Physics

08

B

340/104

G08B 1/08 (2006.01) G08B 26/00 (2006.01)

Patent

CA 1304468

SELECTIVE CLEARING OF LATCHED CIRCUITS ABSTRACT An alarm system includes a controller and a plurality of transponders having different addresses. Certain of the transponders include switch means for monitoring condi- tions, and latch circuits to retain memory of the switch conditions. The controller includes means for positive recognition of a latched alarm or trouble condition in any transponder, before the clear-alarm signal or clear-trouble signal is sent from the controller to restore the alarm circuits to their original states. This insures that an alarm or trouble condition at a transponder is not "missed" by inadvertent clearing before a positive recognition is registered in the controller.

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