Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-11-17
1986-05-27
Brown, Thomas W.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
179 81R, 34082517, H04M 100
Patent
active
045916632
ABSTRACT:
A servo-linearized opto-electronic analog interface for interconnecting a signal generating device to a communications circuit comprises a first opto-isolator arrangement for transmitting signals from the communications circuit to the signal generating device, and a second opto-isolator arrangement for transmitting signals from the signal generating device to the communications circuit, a transmitting diode of the second opto-isolator arrangement being connected in series with a transmitting diode of a further opto-isolator arrangement forming a feedback path providing servo-linearization of the signal transmitted by the signal generating device via the second opto-isolator arrangement to the communications circuit. A further feature of the invention comprises the provision of an additional opto-isolator arrangement acting as a switch for normally isolating the interface from the communications circuit, and responsive to a signal from the signal generating device, indicating that data is to be transmitted, for connecting the interface to the communications circuit.
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Brown Thomas W.
Seeber Joseph G.
Trad, Inc.
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