Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1994-06-23
1996-06-11
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340512, 340513, 34082506, G08B 2900
Patent
active
055259626
ABSTRACT:
A communication system includes a control element, a bidirectional communications link, and one or more devices coupled to the link. The control element, via driver circuits, reversibly applies a predetermined potential to the link for the purpose of energizing the one or more devices as well as communicating therewith. The devices can respond at appropriate time intervals. During the responding time intervals, the control element can continue to supply power to the devices.
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patent: 4667193 (1987-05-01), Cotie et al.
patent: 4916432 (1990-04-01), Tice et al.
patent: 4926158 (1990-05-01), Zeigler
Telecommunication Transmission Handbook, Roger L. Freeman, Third Edition, pp. 737-738 May 1992.
Crosland Donnie L.
Pittway Corporation
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