Visual monitor for electrical signals

Details Visual monitor for electrical signals Visual monitor for electrical signals

1985-06-05

1986-12-09

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

307236, 307311, 324133, 328118, 330 59, 340664, G08B 2100

Patent

active

046283030

ABSTRACT:
A circuit for monitoring the status of electrical signals, such as those present on the control and data lines of an RS-232 interface, includes a single operational amplifier and a dual-color LED indicator. The electrical characteristics of the LED's form a significant part of the circuit parameters. The monitor design provides a predetermined circuit input impedance and positive
egative switching thresholds to effect the selective illumination of the LED's.

REFERENCES:
patent: 3509369 (1970-04-01), Crouse et al.
patent: 3705316 (1972-12-01), Burrows et al.
patent: 3916326 (1975-10-01), Woyton
patent: 3943367 (1976-03-01), Baker
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4218613 (1980-08-01), Blete
patent: 4476439 (1984-10-01), Sato
patent: 4492931 (1985-01-01), Deweck

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