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Title:
FACILITIES EQUIPMENT COMMUNICATION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2005/039069
Kind Code:
A1
Abstract:
A communication circuit is realized which uses three wires, including a power supply, to provide an erroneous-connection protection, a long wiring, and a high-rate transmission. In a communication system using, as a shared wire, one of two AC power supply wires, a first constant current source is series connected, in a master station, with a master station transmission photo-coupler, a reception photo-coupler and a constant voltage diode in the named order from the positive side of the power supply to the negative side thereof serving as a reference, and a communication path, which extends from a node located between the transmission and reception photo-couplers, is wired through a relay to slave stations. In each of the slave stations, a circuit, in which a second constant current source and a slave station reception photo-coupler are series connected with a reference wire, is parallel connected, via a relay, with a photo-coupler so disposed as to short-circuit an output of the relay to the reference wire. The relay is controllably turned on when it is determined that a potential difference between the communication path and the reference wire becomes below a predetermined value.

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Inventors:
DOYAMA YOSHIAKI
TAKEDA YOSHIHIKO
Application Number:
PCT/JP2004/015477
Publication Date:
April 28, 2005
Filing Date:
October 20, 2004
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
DOYAMA YOSHIAKI
TAKEDA YOSHIHIKO
International Classes:
H02H11/00; H04B3/02; H04B3/54; (IPC1-7): H04B3/02; H02H11/00
Domestic Patent References:
WO2000069124A12000-11-16
WO2000075795A12000-12-14
Foreign References:
JPH11313436A1999-11-09
JPS5952754U1984-04-06
JPS5940737A1984-03-06
JPH06253376A1994-09-09
Other References:
See also references of EP 1681776A4
Attorney, Agent or Firm:
Kawamiya, Osamu (IMP Building 3-7, Shiromi 1-chome, Chuo-k, Osaka-shi Osaka, JP)
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