Digital communications system

Details Digital communications system Digital communications system

1978-03-01

1979-11-27

Shaw, Gareth D.

Boots, shoes, and leggings

307311, 250199, 250551, H03K 342

Patent

active

041764013

ABSTRACT:
An interface for use in serial digital data systems incorporates photo-coupling devices. The interface comprises three photo-couplers in the input and output circuits of a data station. Light emitting elements of two photo-couplers are connected in series with the driven element of a third coupler across a reference power supply. The driven element of the third coupler is connected to the output of one data station and also is shunted by the output from a preceding station. Either output causes a current flow to produce light outputs from the two light emitting elements. The light, in turn, operates the driven elements of the other two couplers. The driven element of one of the two couplers supplies data to the one data station, the driven element of the other coupler retransmits data to the next station. The interface is adaptable for use in a closed loop data system by adding a fourth photo-coupler.

REFERENCES:
patent: 3460098 (1969-08-01), De Blauw
patent: 3970784 (1976-07-01), Meijerink
patent: 4016369 (1977-04-01), Pedersen
patent: 4058735 (1977-11-01), Tippner

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