Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-08-14
1981-03-24
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340384E, 340547, 361171, G08B 1308
Patent
active
042583586
ABSTRACT:
The device includes a housing, a keyboard on the housing, and a loudspeaker and electric components within the housing. The housing is mounted on a door adjacent a magnet mounted on the door frame. The device includes an audio alarm circuit including a loudspeaker for generating an audio alarm, a control circuit coupled to the alarm circuit for controlling operation of the alarm circuit, and signal generating curcuitry including door motion sensing logic for sensing when the door has been opened and for generating an alarm signal which is applied to the control circuit for operating the alarm circuit. The device further includes a programmable alarm inhibiting circuit including the keyboard which comprises a plurality of keys and pushbutton switches operated by the keys. The alarm inhibiting circuit includes keyboard decoding logic. A code setting circuit includes three leads which are coupled to the keyboard decoding logic and which are releasably connected to one side of the pushbutton switches. The switches are actuated by the keys to present a number to the keyboard decoding logic which compares that number with a stored number defined by the switches to which the leads are connected. When the number presented to the keyboard decoding logic is presented in a proper timed sequence and corresponds with the stored number, an alarm inhibit signal is produced by the keyboard decoding logic which signal is supplied to the control circuit for stopping the control circuit from operating the audio alarm circuit.
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Lam Hau C.
Lee Thomas K. P.
International Quartz Ltd.
Swann III Glen R.
Vigil Thomas R.
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