Smoke detector with digital display

Details Smoke detector with digital display Smoke detector with digital display

1994-07-13

1996-10-15

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340506, 340517, 340521, 340628, 34082536, 364550, G08B 1900

Patent

active

055658520

ABSTRACT:
An improved environmental alarm system has centralized control of local sensor display capabilities displays, on the sensor itself, a variety of sensor data including sensor address, and detected levels of one or more environmental conditions. Alphanumeric characters are displayed at individual sensors in response to commands from a master microprocessor directing local sensor display content and timing. A local microcontroller within each sensor interprets the detected signal and prepares a resulting data signal that is available for downloading into the alphanumeric display in compliance with a coded message from the master microprocessor.

REFERENCES:
patent: 3767917 (1973-10-01), Lampart et al.
patent: 4231249 (1980-11-01), Zuckerman
patent: 4623878 (1986-11-01), Schoenwetter
patent: 4673920 (1987-06-01), Ferguson et al.
patent: 4744038 (1988-05-01), Okayama
patent: 4924417 (1990-05-01), Yuasa
patent: 5189394 (1993-02-01), Walter et al.
patent: 5227776 (1993-07-01), Starefoss

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