Data transmission and display system

Details Data transmission and display system Data transmission and display system

1974-09-03

1977-03-22

Stewart, David L.

Telegraphy

Systems

Printing

179 15BS, 179 15BA, 343178, H04L 514

Patent

active

040138364

ABSTRACT:
A data transmission and display system including an input data source for transmitting data over a coaxial cable to be processed for use by a remotely-located CRT video display monitor and associated input/output devices and for receiving data over the coaxial cable initiated by the input/output devices. The data transmitted to the CRT video display monitor and to the input/output devices and the data received from the input/output devices takes the form of a plurality of successive data frames each comprising a plurality of successive data intervals. In the first interval of a frame, data is transmitted by the input data source over the coaxial cable in a forward direction to be used by one or more of the input/output devices for performing certain operations specified by the data. In the second interval of the frame, data which may be initiated by one of the input/output devices is transmitted over the coaxial cable in the reverse direction to the input data source for utilization thereby. In the remaining intervals of the frame, display data and associated control data is transmitted by the input data source over the coaxial cable in the forward direction to be used for display purposes by the CRT video display monitor. In accordance with the invention, the data transmitted by the input data source to the CRT video display monitor and to the input/output devices is synchronous in nature and the data initiated by the input/output devices and returned to the input data source is asynchronous in nature.

REFERENCES:
patent: 2498635 (1950-02-01), Bailey
patent: 3493674 (1970-02-01), Houghton
patent: 3691295 (1972-09-01), Fisk
patent: 3865973 (1975-02-01), Masuda

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