Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1978-04-06
1980-05-13
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340521, 340533, G08B 2500
Patent
active
042030960
ABSTRACT:
A time multiplexed sensor monitoring system. A plurality of remote sensor units are connected to a central control unit by a two-wire bus line. Power is supplied to the remote unit sensors by the central control unit. Synchronization of the remote units is provided through momentary interruptions in the power supplied to the remote sensor units. The use of a single two-wire bus line for both application of DC signals to the respective remote sensor units and communication of data from the remote sensor units to the central control unit is facilitated by use of double tone multi-frequency (DTMF) signalling techniques.
REFERENCES:
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patent: 2701748 (1954-04-01), Anderson
patent: 2723309 (1955-11-01), Lair et al.
patent: 3510841 (1970-05-01), Lejon
patent: 3697984 (1972-10-01), Atkinson et al.
patent: 4044351 (1977-08-01), Everson
patent: 4053714 (1977-10-01), Long
Dutton Edmund L.
Farley Max F.
Mallinckrodt Inc.
Waring Alvin H.
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