EP 0004912 B1 19830302 - ANNUNCIATOR OF DANGER
Title (en)
ANNUNCIATOR OF DANGER
Publication
Application
Priority
DE 2817090 A 19780419
Abstract (en)
[origin: US4250353A] A danger alarm system has a plurality of call lines and a plurality of alarm circuits respectively connectible to the call lines and operable to provide signals indicative of environmental conditions about the alarm circuits. A central exchange is connected to the call lines and includes a write-read memory and means connected thereto for inputting the busy condition of each of the lines. A multiplexer is connected between the lines and the memory for sequentially interrogating the memory and the lines. Evaluation circuits are provided and operated upon comparison of the call line signals and the corresponding memory locations.
IPC 1-7
IPC 8 full level
G08B 25/00 (2006.01); G08B 17/00 (2006.01); G08B 26/00 (2006.01)
CPC (source: EP US)
G08B 26/006 (2013.01 - EP US)
Citation (examination)
DE 2552080 A1 19760708 - SAAB SCANIA AB
Designated contracting state (EPC)
CH FR GB IT NL SE
DOCDB simple family (publication)
EP 0004912 A1 19791031; EP 0004912 B1 19830302; AT 373406 B 19840125; AT A283579 A 19830515; DE 2817090 A1 19791025; DE 2817090 B2 19801030; JP S54142098 A 19791105; JP S6239479 B2 19870824; US 4250353 A 19810210
DOCDB simple family (application)
EP 79101031 A 19790404; AT 283579 A 19790417; DE 2817090 A 19780419; JP 4848279 A 19790419; US 2983479 A 19790413