Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1989-03-13
1991-03-12
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340531, 340539, 340537, 340538, G08B 108
Patent
active
049996070
ABSTRACT:
An expansive and expandable monitoring system which in one of its broadest embodiments includes a multi-sector, multi-condition monitoring system including radio linked alert monitors, smoke monitors and an expandable range of activity monitors such as door-opening monitors and toilet-flushing monitors and including method and apparatus for identifying a particular monitor within a sector; wherein each sector stands itself as a unique sub-system built about a two-wire bus on which both power identifying signals are simultaneously conveyed along the same two wires; and within each sector, the plurality of monitoring devices receive operating power from a common power source and convey identifying signals to a common discriminator (identifier) arrangement all along the common two-wire bus, each monitoring device being constructed with a unique arrangement of current modulating and signal/voltage isolation elements to facilitate the common bus--common power source--common discriminator scheme of the present invention; and wherein the system includes unique, all coded receivers including method and apparatus for accepting, encoding, conveying and decoding the coded signals of a plurality of transmitter devices.
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CMOD Manchester Encoder-Decoder HD-15530-Harris Product Information Sheets, 4-1988.
Supertex Inc.--Programmable Encoder/Decoder ED-5, ED-9, ED-11, ED-15; Product Information Sheets--4-1988.
Biotronics Enterprises, Inc.
Crosland Donnie L.
Isaf Louis T.
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