Communications: electrical – Digital comparator systems
Patent
1977-11-23
1980-04-01
Yusko, Donald J.
Communications: electrical
Digital comparator systems
340206, 340167B, H04Q 900, G08C 1506
Patent
active
041964179
ABSTRACT:
A single transmission line interrogated multiple channel data acquisition system is provided in which a plurality of remote station/sensor circuits each monitors a specific process variable and each transmits measurement values over a single transmission line to a master interrogating station when addressed by said master interrogating station. Typically, as many as 330 remote stations may be parallel connected to the transmission line which may exceed 7,000 feet. The interrogation rate is typically 330 stations/second. The master interrogating station samples each station according to a shared, charging transmit-receive cycle. All remote station address signals, all data signals from the remote stations/sensors and all power for all of the remote station/sensors are transmitted via a single continuous terminated coaxial cable. A means is provided for periodically and remotely calibrating all remote sensors for zero and span. A provision is available to remotely disconnect any selected sensor station from the main transmission line.
REFERENCES:
patent: 3668640 (1972-06-01), Driscoll
patent: 3927404 (1975-12-01), Cooper
patent: 3990036 (1976-11-01), Savit
patent: 4005273 (1977-01-01), Siems
patent: 4077030 (1978-02-01), Helava
patent: 4092629 (1978-05-01), Siems et al.
patent: 4093946 (1978-06-01), Fowler
patent: 4099240 (1978-07-01), Rode et al.
Fasching George E.
Keech, Jr. Thomas W.
Breeden David E.
Lupo R. V.
Poteat Robert M.
The United States of America as represented by the United States
Yusko Donald J.
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