Title: Vital electronic code generator

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Abstract: A code generator including a programmed microprocessor for transmitting a selected fixed frequenccy signal through optical isolators to tuned vital relay drivers. Feedback information from these drivers monitors their operation and checks operation of output circuitry. External time delays are provided to check program delays within the system and to ensure against the generation of erroneous codes due to cyclical resetting of the system. A rate selector is provided to permit selection of particular output code rates and is cycle checked continuously to ensure that the system is always certain of the selected code. Unique programming functions are also provided for self checking and for checking the operation of the microprocessor against the operation of external components to provide total system integrity and total system reliability. Diversity and cycle checking are used throughout the system to provide vital qualities. The system has no failure bias and is entirely self checking. Any component or program failure or malfunction causes the system to shut down completely.


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