Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1981-06-08
1983-09-13
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340508, 340511, 340518, 34082554, G08B 2600
Patent
active
044045484
ABSTRACT:
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.
REFERENCES:
patent: 3603949 (1971-09-01), Walthard
patent: 3716834 (1973-02-01), Adams
Mueller Peter
Muggli Jurg
Scheidweiler Andreas
Schibli Eugen
Cerberus AG
Crosland Donnie L.
Kleeman Werner W.
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