Two-wire transmitter

Details Two-wire transmitter Two-wire transmitter

1987-01-16

1989-06-20

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

Condition responsive

34087021, 34087039, 340310R, G08B 2100

Patent

active

048412961

ABSTRACT:
A two-wire transmitter having a detecting section for detecting a physical variable to be measured to produce a detection output, first and second constant voltage devices connected in series with a two-wire transmission path, a signal processor driven by a voltage supplied by the first constant voltage device for converting the detection output into representative serial pulse signals and a switching circuit which is connected in parallel with the second constant voltage device and is turned on and off by the serial pulse signals to produce corresponding output signals from the transmitter on the two-wire transmission path by utilizing a current flowing in the two-wire transmission path while enabling the transmitter to connect in a single loop with another two-wire transmitter.

REFERENCES:
patent: 4238965 (1980-12-01), Mate
patent: 4240067 (1980-12-01), Forme
patent: 4520488 (1985-05-01), Houvia et al.
patent: 4549180 (1985-10-01), Masuda
patent: 4598381 (1986-07-01), Cucci
patent: 4604566 (1986-08-01), Sterling, Jr. et al.

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