Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1988-09-13
1990-03-20
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 77, 340310R, 307127, H02H 318
Patent
active
049106287
ABSTRACT:
A terminal unit for use in an information transmission system disposed between an information transmission line in the information transmission system constituted of signal lines for transmitting a signal by conduction therethrough of a direct current having positive polarity and negative polarity and controlled equipment as one terminal of the system, including at least a coupling circuit for transmitting and receiving a signal to and from the transmission line by converting the signal into a direct current as aforesaid and converting such a direct current into the signal, a transmission control device controlling transmission and reception of a signal according to a protocol for signal transmission, and a transmission circuit and a reception circuit disposed between the coupling circuit and transmission control device for making signal transmission and reception, respectively, and further, comprising a polarity detection circuit for detecting polarity of the direct current voltage supplied from the signal lines and a polarity switching circuit for switching polarities of a signal delivered to the transmission line depending upon the result of detection in the polarity detection circuit.
REFERENCES:
patent: 3973202 (1976-08-01), Gardner
patent: 4027223 (1977-05-01), Renz
patent: 4180746 (1979-12-01), Giuffra
patent: 4374306 (1983-02-01), Lohr
Investigation and Research Commission on Household Intelligent System, "Reports from Investigation and Research Commission on Household Intelligent System (Final Reports)-Section: Technical Standardization", Mar. 1986, pp. 87-89.
Report on Study of Standard Specification for Hone Bus System, Feb. 1987.
Esaki Mitsunobu
Higuma Toshiyasu
Honda Yoshiyuki
Ito Yoshiaki
Minagawa Yoshiji
Deboer Todd E.
Mitsubishi Denki & Kabushiki Kaisha
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