Device for providing a modulo-n check character

Details Device for providing a modulo-n check character Device for providing a modulo-n check character

1979-10-02

1982-09-28

Pitts, Harold I.

Communications: electrical

Visual indication

Movable

340357, 200 25, G08C 906, G08B 500

Patent

active

043520960

ABSTRACT:
Apparatus is disclosed for providing a modulo-n check character as a function of a sequence of data characters. The check character may be used to permit a check of the data character sequence for its correctness, for example, after being transmitted to a data processing installation or after printing. In the preferred embodiments each data character of the sequence is generated by one of a plurality of data character carriers which are selectively set to generate a given character. An additional check carrier is provided to generate the check character. The check carrier is set by a predetermined amount each time one of the data carriers is set so that the ultimately generated check character is a function of the data character sequence.

REFERENCES:
patent: 2689343 (1954-09-01), Mackay
patent: 2758297 (1956-08-01), Cones
patent: 3472978 (1969-10-01), Granata
patent: 3496312 (1970-02-01), Sallow
patent: 3761649 (1973-09-01), Jedynak
patent: 3885165 (1975-05-01), Franks
patent: 4015253 (1977-03-01), Goldstein

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