Parallel bus alarm system

Details Parallel bus alarm system Parallel bus alarm system

1987-03-18

1988-11-15

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 34087016, 340511, G08B 2600

Patent

active

047852852

ABSTRACT:
A parallel bus alarm system in which address signals are represented by successive voltage steps, and responses are represented by current increments. Each alarm element, in response to its addressing, controls a variable current increment to flow in the bus, the magnitude of the current increment being a function of an associated analog measurement to be reported. Each alarm element also causes a predetermined current increment to flow in the bus in response to a condition arising which requires reporting, the total current change thus being directly proportional to the number of alarm indications.

REFERENCES:
patent: 4555695 (1985-11-01), Machida et al.
patent: 4613848 (1986-09-01), Watkins

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