Single transmission line data acquisition system

Details Single transmission line data acquisition system Single transmission line data acquisition system

1981-09-18

1984-05-29

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34087004, 34087039, H04Q 900

Patent

active

044518269

ABSTRACT:
A single transmission line interrogated multiple channel data acquisition system is provided in which a plurality of remote station/sensors monitor specific process variables and transmit measurement values over the single transmission line to a master station when addressed by the master station. Power for all remote stations (up to 980) is provided by driving the line with constant voltage supplied from the master station and automatically maintained independent of the number of remote stations directly connected to the line. The transmission line can be an RG-62 coaxial cable with lengths up to about 10,000 feet with branches up to 500 feet. The remote stations can be attached randomly along the line. The remote stations can be scanned at rates up to 980 channels/second.

REFERENCES:
patent: 4093946 (1978-06-01), Fowler
patent: 4103337 (1978-07-01), Whiteside
patent: 4172252 (1979-10-01), Wiberg
patent: 4196417 (1980-04-01), Fasching et al.
patent: 4203096 (1980-05-01), Farley
patent: 4227181 (1980-10-01), Brittain
patent: 4311986 (1982-01-01), Yee
patent: 4316262 (1982-02-01), Mizuta

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