Process for generating and transmitting different analog measure

Details Process for generating and transmitting different analog measure Process for generating and transmitting different analog measure

1977-08-04

1979-07-17

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular system function

340584, 340628, G08B 2300

Patent

active

041617274

ABSTRACT:
A fire alarm system has a central control connected to an alarm loop composed of a plurality of fire alarm circuits. Prior to an interrogation of the alarm circuits, the same are disconnected from a supply voltage and supplied by respective capacitors which are charged during connection of a full supply voltage. The individual alarms are subsequently reconnected in the alarm loop in a given sequence by a new voltage change, at a reduced voltage, and each alarm circuit is operable to connect the following alarm circuit to the loop and thus to the line voltage at a time delay corresponding to a measured value of a fire characteristic being monitored by that alarm circuit. In a central analysis device, the relevant alarm circuit address can be derived from the number of preceding increases in line current, and the associated measured value can be derived from the length of the switching delay of the corresponding alarm circuit. Different sequences of applying line voltage may be used such that three line voltage states of "rest interval--interrogation--capacitor charge" and "rest interval--capacitor charge--interrogation" and also the different durations of these states in that the line voltage state "rest interval" is approximately one hundred times greater than is common to the other line states.

REFERENCES:
patent: 3214734 (1965-10-01), Whitehead
patent: 3482243 (1969-12-01), Buchsbaum
patent: 3676877 (1972-07-01), Kobayashi
patent: 3753258 (1973-08-01), Honda
patent: 3797008 (1974-03-01), Yuasa
patent: 3832678 (1974-08-01), Gysell et al.
patent: 3932858 (1976-01-01), Smith et al.

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