Keyboard controlled vital digital communication system
First Claim
1. 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 a predetermined number of operation instructions, comprising:
- keyboard encoder means for generating the operation instructions in the form of multi-digit keyboard words;
vital decoding means coupled to said keyboard encoding means for identifying said keyboard words and for producing message words, diverse output words and diverse display words based on said keyboard words, and display echo words based on said display words;
display means coupled to said decoding means for displaying a representation of said display words;
said vital decoding means including means for sequentially producing diverse multi-bit checkwords based on predetermined words generated by said system indicative of system performance, said predetermined words including said message words, said display words, and said display echo words in response to receipt of said keyboard words, and means for checking that successive of said checkwords are diverse, said checking means including,means for comparing each generated checkword to a predetermined constant multi-bit pattern, and for producing a validation signal if sequential ones of said checkwords are complementary and corresponding to said constant multi-bit pattern, said vital decoding means activating the output device in accordance with the keyboard instructions only if said validation signal is produced.
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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.
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Citations
16 Claims
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1. 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 a predetermined number of operation instructions, comprising:
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keyboard encoder means for generating the operation instructions in the form of multi-digit keyboard words; vital decoding means coupled to said keyboard encoding means for identifying said keyboard words and for producing message words, diverse output words and diverse display words based on said keyboard words, and display echo words based on said display words; display means coupled to said decoding means for displaying a representation of said display words; said vital decoding means including means for sequentially producing diverse multi-bit checkwords based on predetermined words generated by said system indicative of system performance, said predetermined words including said message words, said display words, and said display echo words in response to receipt of said keyboard words, and means for checking that successive of said checkwords are diverse, said checking means including, means for comparing each generated checkword to a predetermined constant multi-bit pattern, and for producing a validation signal if sequential ones of said checkwords are complementary and corresponding to said constant multi-bit pattern, said vital decoding means activating the output device in accordance with the keyboard instructions only if said validation signal is produced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vital digital control system for activating with keyboard inputs at least one output device in response to a manual keyboard selection of a sequence of a predetermined number of operation instructions, comprising:
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keyboard encoder means for generating the operation instructions in a format defined by successive pairs of diverse multi-digit keyboard words, each pair of diverse keyboard words separated by a constant multi-bit framing sequence; vital decoding means coupled to said keyboard encoding means for identifying each pair of keyboard words from said framing sequence and for producing diverse message and copy words, diverse output words and diverse display words based on said keyboard words; display means coupled to said decoding means for displaying a representation of said display words; said decoding means including, means for producing a display echo word based on said display words, means for producing diverse output signature words based on said output words, a memory for storing a table of checking normalization words to be used in formulating pairs of diverse multi-bit checkwords; means of producing diverse diagnositic signature words based on the normalization words stored in said memory; means for repetitively forming pairs of diverse checkwords based at least partially on predetermined arithmetic combinations of said diverse message and copy words, said display echo words, said output signature words, and said diagnostic signature words, means for comparing successive pairs of checkwords to determine that successive of said pairs are diverse and equal to a predetermined constant multi-bit pattern, means for generating a validation signal based on a determination by said comparing means that said checkwords are diverse and equal to said constant multi-bit pattern, and means for activating the at least one output device in accordance with the keyboard instruction only in the presence of said validation signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification