Two-wire communication apparatus

Details Two-wire communication apparatus Two-wire communication apparatus

1988-03-15

1989-05-16

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With supply voltage regulation or compensation

34087007, 34087031, 34087016, 364172, G08C 1904

Patent

active

048313750

ABSTRACT:
A communication apparatus inserted in parallel in a two-wire communication line of a two-wire measuring instrument which consists of a transmitter and a receiver connected to each other through the two-wire communication line and transmits a process value detected by the transmitter to the receiver as an analog signal, the communication apparatus being adapted to communicate with the transmitter, comprising a switching device for separating a closed loop constituted by the transmitter and the receiver into a first loop including the transmitter and a second loop including the receiver, a power source for supplying power to the transmitter in the first loop, and dummy output means for outputtting a dummy signal to the receiver in the second loop.

REFERENCES:
patent: 4520488 (1985-05-01), Houvig et al.
patent: 4549180 (1985-10-01), Masuda
patent: 4607247 (1986-08-01), Sterling, Jr. et al.
patent: 4758837 (1988-07-01), Fruhwald

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