Transmitter for transmitting on a two-wire transmitting line

Details Transmitter for transmitting on a two-wire transmitting line Transmitter for transmitting on a two-wire transmitting line

1986-10-01

1989-02-21

Caldwell, Sr., John W.

Communications: electrical

Systems

Selsyn type

34087018, 34087039, 375 5, 375 24, H04M 1104, G08C 1916

Patent

active

048069051

ABSTRACT:
A transmitter for repeatedly transmitting a measured value in the form of a digital signal through a two-wire transmission line, includes a receiving unit for receiving a digital command signal from a communicator through the two-wire transmission line, and a processor for sending out a response signal in response to the command signal upon reception thereof. The measured value is sent using a newest measured value after repetitive transmission of the measured value is interrupted. The measured value is transmitted from the transmitter by a change in current supplied to the two-wire transmission line, and reception of the command signal is performed by a change in interline voltage of the two-wire transmission line.

REFERENCES:
patent: 4400688 (1983-08-01), Johnston et al.
patent: 4520488 (1985-05-01), Houvig et al.
patent: 4611274 (1986-09-01), Machino et al.

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