Serial line communication system

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371 5, 371 33, G06F 1110, G06F 1114

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active

042702054

ABSTRACT:
A serial line communication system is provided whereby a plurality of remote units are tied to a central site through a serial communication line. Each remote unit is provided with an automatic bit rate detection means. Messages returning from the remotes are checked at the central site for errors. If errors occur, the central site automatically retries to achieve error-free communication. If necessary to achieve error-free communication, the central site is provided with means for automatically shifting to a lower secondary bit rate to achieve communications with a particular remote. The central site then shifts back to the higher primary bit rate for communication with the next remote.

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patent: 3676846 (1972-07-01), Busch
patent: 3747074 (1973-07-01), Shulze
patent: 3754211 (1973-08-01), Rocher et al.
patent: 3775751 (1973-11-01), Anderson
patent: 3876979 (1975-04-01), Winn et al.
patent: 3978407 (1976-08-01), Forney, Jr. et al.
patent: 4082922 (1978-04-01), Chu
patent: 4144522 (1979-03-01), Kageyama et al.
De Shon, Microprocessors Improve Serial Communication, Control Engineering, pp. 127-131, Mar. 1978.

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