Title:
AUTOMATIC FIRE ALARM SYSTEM AND BASE DEVICE FOR AUTOMATIC FIRE ALARM SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/159510
Kind Code:
A1
Abstract:
A second remote device (4) transmits downstream current signals by changing a current flowing through a pair of electrical wires (51, 52). In a base device (2), a resistance (22) is provided between an application unit (21) and the pair of the electrical wires (51, 52) and limits the current flowing through said electrical wires (51, 52) when a first remote device (3) short-circuits said electrical wires (51, 52) together. A reception unit (23) in the base device (2) receives downstream voltage signals obtained by converting the abovementioned downstream current signals to voltage changes along the pair of electrical wires (51, 52) via the voltage drop across the abovementioned resistance (22).
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Inventors:
MATSUMOTO TADASHI
Application Number:
PCT/JP2015/001973
Publication Date:
October 22, 2015
Filing Date:
April 08, 2015
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G08B17/00
Foreign References:
| JP2011243106A | 2011-12-01 | |||
| JP2002109649A | 2002-04-12 | |||
| JP2003109138A | 2003-04-11 |
Other References:
See also references of EP 3133568A4
Attorney, Agent or Firm:
FUJII, Kentaro et al. (JP)
Fujii Kentaro (JP)
Fujii Kentaro (JP)
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