Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1979-02-28
1981-03-17
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340 63, 340528, 340541, G08B 1300, G08B 1900, B60R 2510
Patent
active
042570387
ABSTRACT:
An electronic security system has a plurality of remote sending units which transmit coded intrusion and other emergency signals to a central alarm station. The alarm station decodes the received signals and produces an appropriate warning from an alarm generator. Electronic alarm controls at the central station discriminate the intrusion signals from other emergency signals and may block or delay the intrusion signals to allow entry or exit from the protected area. Testing circuits are also included in the alarm controls to establish a test mode of operation in which sending units transmit intrusion signals, and receipt is indicated without actuating the alarm generator. During the test mode of operation, the alarm control still accepts priority alarm signals from other sending units and generates alarm warnings from the alarm generator. The alarm control also provides alarm warnings from priority alarm signals after disarming signals are received to permit authorized entry, and provides vehicle intrusion warnings unless cancelled by a second coded transmission.
REFERENCES:
patent: 3795896 (1974-03-01), Isaacs
patent: 3833895 (1974-09-01), Fecteau
patent: 3852740 (1974-12-01), Haymes
patent: 3858194 (1974-12-01), Jedynak et al.
patent: 3914692 (1975-10-01), Seaborn, Jr.
patent: 4032848 (1977-06-01), Shaughnessy
patent: 4110738 (1978-08-01), Sattin
Ranney Richard D.
Rounds Michael F.
Notifier Company
Swann III Glen R.
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