Excavating
Patent
1980-06-09
1983-01-11
Atkinson, Charles E.
Excavating
364900, 371 70, G06F 1108
Patent
active
043685340
ABSTRACT:
A vital digital control system with keyboard inputs for activating at least one output device in response to a manual keyboard selection of a sequence of the predetermined number of operation instructions, including a keyboard encoder for generating a message based on the operation instructions, a vital decoder coupled to the keyboard encoder for identifying each pair of message words and for producing diverse output words and diverse display words based on the message words and diverse display echo words based on the display words, and a display coupled to the decoder for displaying a representation of the display words. The vital decoder includes means for sequentially producing diverse multi-bit checkwords based on predetermined words generated by the system indicative of system performance, these predetermined words including the display words and the display echo words. The checkwords are produced in response to receipt of the message words and may be based additionally on diagnostic testing routines formed before, during, and after receipt of the keyboard instructions. The vital decoder compares each of the generated checkwords to a predetermined constant multi-bit pattern and produces a validation signal if sequential ones of the checkwords are complementary and are identical to the milti-bit pattern, whereupon the vital decoder activates output devices in accordance with the specific keyboard instructions, but only in the event that valid system operation is indicated by means of the presence of the validation signal.
REFERENCES:
patent: 3686629 (1972-08-01), Yu
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patent: 3978449 (1976-08-01), Sanders et al.
patent: 3995173 (1976-11-01), Sibley
patent: 4090173 (1978-05-01), Sibley
patent: 4092732 (1978-05-01), Ouchi
patent: 4181849 (1980-01-01), Sibley
Atkinson Charles E.
General Signal Corporation
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