EP 0042501 B1 19850508 - DEVICE FOR THE TRANSMISSION OF MEASURED VALUES IN A FIRE WARNING SYSTEM
Title (en)
DEVICE FOR THE TRANSMISSION OF MEASURED VALUES IN A FIRE WARNING SYSTEM
Publication
Application
Priority
CH 480380 A 19800623
Abstract (en)
[origin: US4404548A] In a fire alarm system individual fire alarms are connected in series by reporting lines with a central signal station. In order to be able to connect a greater number of fire alarms with the individual reporting or signaling lines and/or in order to be able to dispatch an increased amount of current through the reporting lines, the reporting or signaling lines from the last fire alarm of a line are returned back to the central signal station in the form of a ring circuit or loop. Upon the absence of signals at a reporting line an interrogation device is reversed, so that there can be ensured that in the event of a line disturbance or breakdown of a fire alarm the remainder of the fire alarms still can be utilized for giving a signal. The individual fire alarms are structured such that during assembly the inputs and outputs can be mutually interchanged.
IPC 1-7
IPC 8 full level
G08B 25/00 (2006.01); G08B 17/00 (2006.01); G08B 26/00 (2006.01); G08B 29/02 (2006.01); G08B 29/06 (2006.01)
CPC (source: EP US)
G08B 17/00 (2013.01 - EP US); G08B 26/005 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0042501 A1 19811230; EP 0042501 B1 19850508; AT E13231 T1 19850515; CH 651688 A5 19850930; DE 3170379 D1 19850613; DK 263881 A 19811224; FI 811935 L 19811224; JP S5730098 A 19820218; JP S64753 B2 19890109; NO 152526 B 19850701; NO 152526 C 19851009; NO 812130 L 19811228; US 4404548 A 19830913
DOCDB simple family (application)
EP 81104115 A 19810529; AT 81104115 T 19810529; CH 480380 A 19800623; DE 3170379 T 19810529; DK 263881 A 19810616; FI 811935 A 19810618; JP 9541281 A 19810622; NO 812130 A 19810622; US 27118781 A 19810608