Selective clearing of latched circuits

Details Selective clearing of latched circuits Selective clearing of latched circuits

1988-04-29

1990-08-28

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825360, 340502, G08B 2900, H04Q 900

Patent

active

049529269

ABSTRACT:
An alarm system includes a controller and a plurality of transponders having different addresses. Certain of the transponders include switch means for monitoring conditions, 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.

REFERENCES:
patent: 4162488 (1985-07-01), Silverman et al.
patent: 4524354 (1985-06-01), Morgan
patent: 4652868 (1987-03-01), Hart
patent: 4658249 (1987-04-01), Vogt

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