Two-wire transmitter

Details Two-wire transmitter Two-wire transmitter

1978-09-15

1980-12-30

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With particular transmitter

323 75N, 324 62, 324DIG1, 34087039, G08C 1904, G01R 2700

Patent

active

042426650

ABSTRACT:
Disclosed is a two-wire transmitter which transmits information over a pair of wires having an external supply connected thereto. The transmitter receives its power from the pair of wires and stores a portion of this power during spaced apart first time intervals. This stored power is used to excite an external sensor during second time intervals that are substantially shorter than the first time intervals and which lie between respective ones of the first time intervals. The excitation response from the sensor is sampled and held in synchronization with this excitation. A variable resistance device is included for insertion in series with the pair of wires. This device is responsive to the held excitation response from the sensor to allow a current representative thereof to flow through the pair of wires.

REFERENCES:
patent: B510026 (1976-04-01), Grindheim
patent: 3503261 (1970-03-01), Riester et al.
patent: 3717858 (1973-02-01), Hadden
patent: 3800300 (1974-03-01), Oosterhout
patent: 4083039 (1978-04-01), Simon
patent: 4143550 (1979-03-01), Kobayashi

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