Data transmission system and method

Details Data transmission system and method Data transmission system and method

1981-03-25

1983-10-18

Atkinson, Charles E.

Excavating

34082505, 34082508, 370 86, 371 62, H04Q 900, G06F 1100

Patent

active

044109857

ABSTRACT:
A central station and a plurality of transmission stations are connected in cascade by a serial transmission line, and constitute a looped data highway system. The central station controls the whole system. The system allows the transmission station having a data signal transmission request to send out a data signal by means of a normal polling signal, but only the station having sent out the data signal by means of the preceding normal polling signal is allowed to send out the data signal again in response to a retry polling signal.

REFERENCES:
patent: 3639694 (1972-02-01), Deutsch et al.
patent: 3652993 (1972-03-01), Bridwell et al.
patent: 3723971 (1973-03-01), Betts et al.
patent: 3728681 (1973-04-01), Fuller et al.
patent: 4078228 (1978-03-01), Miyazaki
V. A. Albaugh et al., Fault Detection on Serial Communication Bus, IBM Technical Disclosure Bulletin, vol. 22, No. 5, Oct. 1979, pp. 1778-1779.

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