Two-wire dc communication system and transceiver

Details Two-wire dc communication system and transceiver Two-wire dc communication system and transceiver

1996-09-04

1997-12-02

Mullen, Thomas

Communications: electrical

Systems

Selsyn type

34031001, 34031006, 340538, 455 33, 236 51, 165 22, H04M 1104

Patent

active

056941099

ABSTRACT:
Arrangement for dc signaling between a transmitter or transceiver over a single pair of conductors to another transceiver or receiver of similar design. The conductors carry a dc communications voltage at a level V.sub.comm (e.g., 24 to 35 volts dc) and power for the tranceivers, receivers and/or transmitters of the system. The transceiver comprises a microprocessor having a signal input terminal V.sub.in, a signal output terminal V.sub.out, a sensor input circuit coupled to a sensor transducer, e.g., a temperature sensor, and a control output circuit coupled to control an external device, e.g., a furnace relay. A voltage limiting circuit device coupled to the pair of conductors supplies the microprocessor with a supply voltage V.sub.dd at a predetermined level (e.g., 5 volts dc) less than the communications voltage level V.sub.comm. A signal input/output circuit coupled to the pair of conductors and to the microprocessor signal input and output terminals applies incoming pulse signals from the conductors to the input terminal, and applies onto the dc conductors output pulse signals. The output signals have high and low values respectively at the dc communications voltage level V.sub.comm and a predetermined voltage level V.sub.Z2 (e.g., 10 to 12 volts) between the communications voltage V.sub.comm and the supply voltage V.sub.dd. The signal input/output circuit can comprise a zener and a transistor.

REFERENCES:
patent: 4806905 (1989-02-01), McGowan, III et al.
patent: 4816703 (1989-03-01), Sterling, Jr. et al.
patent: 4899131 (1990-02-01), Wilk et al.
patent: 5003457 (1991-03-01), Ikei et al.
patent: 5089974 (1992-02-01), Demeyer et al.
patent: 5197668 (1993-03-01), Ratz et al.
patent: 5451923 (1995-09-01), Seberger et al.
patent: 5581246 (1996-12-01), Yarberry et al.

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