Circuit arrangement for the transmission of measurements to a ce

Details Circuit arrangement for the transmission of measurements to a ce Circuit arrangement for the transmission of measurements to a ce

1981-05-13

1984-03-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular system function

340533, 34087017, 34087019, G08B 2900, G08B 1706

Patent

active

044356986

ABSTRACT:
Several arrangement in which several measurement sources (fire alarms) are connected in parallel to a two-wire line. The supply voltage for the measurement sources is simultaneously fed through this line. Here, a measurement is formed by switching a measurement shunt circuit into the two-wire line, to generate measurement pulses, where the switch-in process is controlled by a local pulse generator. Each measurement source is provided with a pulse generator, and all these pulse generators operate at frequencies of the same order of magnitude. A monitoring circuit, at the far end of the two-wire line, is switched through by a pulse generator whose frequency is significantly lower. The pulse duration of the monitoring pulses is no longer than the pulse pauses of the measurement pulses.

REFERENCES:
patent: 3426348 (1969-02-01), Sadler
patent: 3553730 (1971-01-01), Kaplin et al.
patent: 3665461 (1972-05-01), Gnagi et al.
patent: 3778796 (1973-12-01), Honda
patent: 4247848 (1981-01-01), Kitta et al.

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