Data-handling system for the exchange of digital messages betwee

Details Data-handling system for the exchange of digital messages betwee Data-handling system for the exchange of digital messages betwee

1982-09-13

1985-05-28

Atkinson, Charles E.

Excavating

G06F 1110

Patent

active

045204810

ABSTRACT:
Two intercommunicating functional units, namely a master unit such as a processor and an associated peripheral or slave unit, exchange 32-bit messages--with 24 information bits followed by 8 cyclic redundancy bits--by way of a control unit and upon initiation by the master unit. A receiving section of each functional unit includes a redundancy generator which, on the basis of the information bits of an incoming message, recalculates the redundancy bits in accordance with a predetermined polynomial code and sends the result to the control unit which has a similar redundancy generator responsive to the information bits of a transiting message for recalculating the same redundancy bits. The control unit compares the locally generated redundancy bits with those of the transiting message and those sent back from the message-receiving unit; in the event of a discrepancy, it identifies one or the other functional unit as the site of a detected error.

REFERENCES:
patent: 3273119 (1966-09-01), Helm
patent: 3319223 (1967-05-01), Helm
patent: 3439329 (1969-04-01), Betz et al.
patent: 4242752 (1980-12-01), Herkert

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