Asynchronous communications system

Details Asynchronous communications system Asynchronous communications system

1987-03-30

1989-02-07

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

370 91, H04Q 100

Patent

active

048034819

ABSTRACT:
The communications system uses a master line, a slave line and at least one call line to effect true asynchronous communication. A protocol is established whereby a master unit takes control of the call line when the master line and slave line are at the same logical state. The slave unit has control of the call line when the master line and slave line are at different logical states. The system includes an interchange device which routes communications signals in accordance with channel identification commands sent over the communications system. The communications scheme can be implemented on a wide variety of digital communicating devices through the use of a universal command instruction set which provides the data manipulation functions required by most microprocessors.

REFERENCES:
patent: 3721763 (1973-03-01), Homan et al.
patent: 3940558 (1976-02-01), Gabbard et al.
patent: 4282493 (1981-08-01), Moreau
patent: 4328586 (1982-05-01), Hansen
patent: 4454383 (1984-06-01), Judd
George E. Friend et al. Understanding Data Communications, First Ed., A Howard W. Sams & Co. Publication, 1984.

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