Title:
SELECT TEST CIRCUIT FOR FIRE SENSOR, ETC.
Document Type and Number:
Japanese Patent JPS57172495
Kind Code:
A
Abstract:
A circuit for selectively or extractively testing a fire detector among a plurality of fire detectors which are connected between an alarming line extending from the section relay of a receiving unit and a common line is disclosed. An inherent address code is allotted to each fire detector. When an address signal transmitted through the alarming line coincides with the allotted inherent address code, a coincidence signal is produced and in response to said coincidence signal a test voltage is generated for each fire detector.
Inventors:
YOSHIZAKI YUKIO
Application Number:
JP5553481A
Publication Date:
October 23, 1982
Filing Date:
April 15, 1981
Export Citation:
Assignee:
NITTAN CO LTD
International Classes:
G08B17/00; G01R31/02; G08B29/00; G08B29/04; G08B29/14; (IPC1-7): G01R31/02; G08B17/00; G08B29/00
Domestic Patent References:
| JPS52110595A | 1977-09-16 |