Burglar alarm with re-entry feature
First Claim
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1. A method of operating an alarm system for an enclosure having a plurality of closable entrances, comprising the steps of:
- sensing the removal of a key from a key switch;
monitoring the opening and closing of said entrances;
detecting the subsequent closing of all entrances opened after the sensing of said key removal; and
upon such detection, arming said alarm system and indicating such arming and such detection with an audible tone.
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Abstract
An "Automatic Exit Delay" circuit of a burglar alarm is placed on Stand-By whenever a "first" door is opened and the burglar alarm automatically starts to work right after the "last" door is closed. At that moment of arming a "Quiet Quick Test" Network automatically tests the alarm for proper functioning and generates a short "beep" to indicate such as well as the armed state of the alarm system.
16 Citations
12 Claims
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1. A method of operating an alarm system for an enclosure having a plurality of closable entrances, comprising the steps of:
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sensing the removal of a key from a key switch; monitoring the opening and closing of said entrances; detecting the subsequent closing of all entrances opened after the sensing of said key removal; and upon such detection, arming said alarm system and indicating such arming and such detection with an audible tone. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An alarm system for an enclosure having a plurality of closable entrances, comprising:
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sensing means for sensing the removal of a key from a key switch of said enclosure; monitoring means for monitoring opening and closing of said entrances; detecting means for detecting opening and subsequent closing of said entrances after sensing of said key removal; arming means, responsive to said detecting means, for arming said alarm system and subsequently outputting an audible tone as an indication of both said arming and said detecting of said opening and subsequent closing of said entrances. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification