Multiple-mode electrical power and communications interface

Details Multiple-mode electrical power and communications interface Multiple-mode electrical power and communications interface

1984-12-07

1987-02-03

Olms, Douglas W.

Communications: electrical

Systems

Selsyn type

370 31, H04M 1104, H04B 320

Patent

active

046411267

ABSTRACT:
A multiple-mode electrical power and communications interface includes a command encoder (10) modulating the frequency generated by a variable frequency power source (12) for transmission over one of two signal transmission paths (16/26) to a remotely located data acquisition and transmission network (32). The signal transmission paths (16/26) are connected via inductive couplers (20/24) to different directional control stages (50/52) which selectively enable corresponding frequency separators (54/62) for filtering the command component from the power component and applying the former to a command decoder (56). The direction control stages enable one of a pair of local transmitters (58/64) to send information encoded by a data encoder (60) over the other of the two signal transmission paths. A mode shifting transmit/receive switch (15) simultaneously and separately connects the two signal paths to the power source (12) and a data decoder (30). In the event of loss of one of the two signal paths, the mode shifting switch (15) can sequentially connect the power source (12) and data decoder (30) to the same signal transmission path.

REFERENCES:
patent: 3843834 (1974-10-01), Burke
patent: 4131882 (1978-12-01), Hollabaugh et al.
patent: 4136327 (1973-07-01), Flanders et al.
patent: 4399530 (1983-08-01), Demange et al.
patent: 4413250 (1983-11-01), Porter
patent: 4450555 (1984-05-01), Pays
patent: 4540875 (1985-09-01), Buttolph, III

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