Communications: electrical – Systems – Selsyn type
Patent
1993-12-27
1997-06-03
Swarthout, Brent A.
Communications: electrical
Systems
Selsyn type
236 46R, H04M 1104
Patent
active
056358962
ABSTRACT:
A communication system comprises a remote switching module having two signal terminals connected by just two conductors to the signal terminals of a local decoding module. Power is directly provided only to the local decoding module, which applies DC voltage of a first level across the conductors. The remote switching module has a voltage regulator which provides power of a second voltage level lower than the first level for operating a control unit in the switching module. The control unit controls a variable impedance having higher and lower impedance levels and which is connected across the switching module's signal terminals. The decoding module can detect the different impedance levels by sensing the current flow on the conductors. The switching module communicates with the decoding module by modulating the time intervals between changes in impedance levels. The system has particular utility for retrofitting cooling to a heating systems where preexisting thermostat wiring has only two conductors, say when an air conditioning function is added to a previously heat only system. The system is also useful when installing electronic thermostats on heating and cooling systems originally controlled by a mechanical thermostat.
REFERENCES:
patent: 3659277 (1972-04-01), Brown
patent: 4078720 (1978-03-01), Nurnberg
patent: 4333605 (1982-06-01), Peters
patent: 4412450 (1983-11-01), Franz et al.
patent: 4413250 (1983-11-01), Porter et al.
patent: 4420693 (1983-12-01), Becker et al.
patent: 4433718 (1984-02-01), Bresin
patent: 4500821 (1985-02-01), Bitting et al.
patent: 4623871 (1986-11-01), Akano
patent: 4633217 (1986-12-01), Akano
patent: 4741476 (1988-05-01), Russo et al.
patent: 4751961 (1988-06-01), Levine et al.
patent: 4776514 (1988-10-01), Johnstone et al.
patent: 4780872 (1988-10-01), Masuda et al.
patent: 4783659 (1988-11-01), Frick
patent: 4841296 (1989-06-01), Kadoya
patent: 4864513 (1989-09-01), Levine et al.
Schwarz Edward L.
Tinsley Timothy M.
Honeywell Inc.
Schwarz Edward L.
Swarthout Brent A.
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