Title:
REPEATER FOR SELF-FIRE ALARM SYSTEM
Document Type and Number:
Japanese Patent JP3624591
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: 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.
SOLUTION: 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:
Misao Takano
Yoshinori Nakagawa
Yoshinori Nakagawa
Application Number:
JP31517596A
Publication Date:
March 02, 2005
Filing Date:
November 26, 1996
Export Citation:
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
Domestic Patent References:
| JP63136194A | ||||
| JP6372690U |
Attorney, Agent or Firm:
Hiroyuki Nakai
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