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Title:
REPEATER FOR SELF-FIRE ALARM SYSTEM
Document Type and Number:
Japanese Patent JPH10162270
Kind Code:
A
Abstract:

To speedily issue a fire alarm from both an emergency fire transmitter and a fire sensor even in case of power supply stop by providing a repeater with a power supply stop detecting means for outputting a storage cancel signal to a transmitter responding terminal when power supply is stopped.

A repeater 1 is provided with a voltage discrimination circuit 11 for always monitoring the voltage level of sensor line L and discriminating the alarm due to a fire sensor S and the alarm due to an emergency fire transmitter P and a switching circuit 12 for short-circuitting and connecting a transmitter response line LA to a common terminal C. A power supply stop detecting means B is constituted by combining these voltage discrimination circuit 11 and switching circuit 12. When power supply to the repeater 1 is stopped, the storage cancel signal is transmitted to a fire receiver 2 and storage operation is canceled so that the alarm from the fire sensor S and the emergency fire transmitter P can be speedily issued.


Inventors:
TAKANO MISAO
NAKAGAWA YOSHIAKI
Application Number:
JP31517596A
Publication Date:
June 19, 1998
Filing Date:
November 26, 1996
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
G08B17/06; G08B17/00; G08B19/00; G08B23/00; G08B29/18; (IPC1-7): G08B19/00; G08B17/00; G08B17/06; G08B23/00; G08B29/18
Attorney, Agent or Firm:
Hiroyuki Nakai



 
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