Communications: electrical – Continuously variable indicating – With meter reading
Patent
1981-03-13
1983-07-19
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
340505, 340511, 34082537, 340593, H04Q 900, G08B 2300
Patent
active
043946550
ABSTRACT:
The signalling system disclosed herein transmits groups of pulses to a plurality of transponders, and each transponder recognizes its address in a particular group of pulses. The group of pulses can reset the system, command a transponder to accomplish a specific function, or command the transponder to do nothing. Information returned from the transponder includes a reference voltage, which can be compared in the controller to continuously determine the margin from alarm of an associated transducer. The transponder further provides a signal identifying itself, and pulse duration signals representing analog signals received from one or more transducers associated with the transponders. No end-of-line termination is required, and branching is possible at any point along the loop.
REFERENCES:
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patent: 4006460 (1977-02-01), Hewitt et al.
patent: 4206449 (1980-06-01), Galvin et al.
patent: 4222041 (1980-09-01), Von Tomkewitsch et al.
patent: 4287515 (1981-09-01), Raber et al.
patent: 4311986 (1982-01-01), Yee
patent: 4346380 (1982-08-01), Monticelli et al.
Vogt William R.
Wynne John M.
Baker Industries Inc.
Jennings, Jr. James J.
Yusko Donald J.
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