Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1982-08-18
1984-01-24
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340506, 340508, 340510, 340517, 340518, 340527, 340528, 340333, 34082506, 3408251, 34082531, 179 5R, G08B 2900
Patent
active
044279744
ABSTRACT:
In a central station alarm system the alarm sensors associated with a particular subscriber's premises are monitored by a local control unit associated with those premises and controllable by the subscriber. The local control unit automatically reminds the subscriber when he is supposed to close the premises and turn on the system. The local control unit allows the subscriber to change his expected closing time. The local control unit may also perform various other functions such as automatically cutting off power to low priority alarm sensors during a prolonged power failure, automatically cancelling any audible alarm indication silence commands when there are no alarms to silence, and automatically forming a bridge connection between the remote ends of two communication circuits when there is a break in either circuit.
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American District Telegraph Company
Crosland Donnie L.
Jackson Robert R.
Smith Charles B.
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