Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1999-02-09
2000-07-04
Pope, Daryl
Communications: electrical
Condition responsive indicating system
With particular system function
340524, 34082536, 34082549, G08B 2900
Patent
active
060845090
ABSTRACT:
An apparatus is disclosed for use in a multi-zone alarm system having a single-pair wire alarm loop and programmable switching circuit arrangements. The apparatus includes a current source serially connected to the single-pair wire loop and selectively operative to provide a predetermined current signal in the loop. A plurality of zone sensing devices are arranged in a normally closed series circuit along the single-pair wire loop. Each of the zone sensing devices is adapted for generating coded voltage changes and alarm activation caused by an open circuit created therein. An element is provided for indicating the condition of each of the zone sensing devices, while a mechanism is provided for selectively arming and disarming the zone sensing devices. A circuit arrangement is provided for indicating an open circuit in the single-pair wire loop unrelated to the condition of the zone sensing devices, while another circuit is operative in response to the zone sensing devices to provide a signal indication of the zone in which alarm activation has occurred. Finally, a circuit mechanism is provided for continuously monitoring all circuit conditions of the apparatus in both the armed and disarmed operative conditions.
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Isaac John L.
Pope Daryl
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