Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1977-09-19
1980-02-19
Trafton, David L.
Communications: electrical
Condition responsive indicating system
With particular system function
340149R, 340164R, 340528, 367 93, G08B 1316
Patent
active
041897196
ABSTRACT:
An intrusion alarm system includes a microcomputer and keyboard for providing control functions for the alarm system with greater reliability and with greatly increased security as compared with prior art systems. The disclosed system provides a positive means for deactivating the alarm system only by authorized personnel by the use of a multi-digit code which must be correctly entered on the keyboard within a prescribed short period of time after entry into the protected zone. Upon entry into the protected zone, the system goes immediately into a preliminary alarm stage which, for example, may be the lighting of a floor lamp in the room. The person entering the premises then has thirty seconds to enter the correct code on the keyboard attached to the front panel of the alarm unit to deactivate the system. If an unauthorized person enters and cannot provide the required code, the system enters the final alarm stage which turns on the automatic dialer to notify the police and also turns on auxiliary sirens, outdoor lights, and any other alarm outputs that may be desired.
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Hall James G.
Massa Donald P.
The Stoneleigh Trust
Trafton David L.
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