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Space Shuttle Avionics: Difference between revisions
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→Illegal entry
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When the DPS receives an input it cannot parse, it will reject it and write a message to the fault line. This can have a number of reasons which all require a different user response. | When the DPS receives an input it cannot parse, it will reject it and write a message to the fault line. This can have a number of reasons which all require a different user response. | ||
* The message is not properly formated. For instance ITEM 8 PRO is not valid syntax, PRO closes | * The message is not properly formated. For instance <b>ITEM 8 PRO</b> is not valid syntax, <b>PRO</b> closes an <b>OPS</b> or <b>SPEC</b> command, not an <b>ITEM</b>. Check the syntax of the entered string. | ||
* The selected item may not be legal in the current major mode / OPS. In general the software cannot perform all possible functions in all phases of the flight. For instance the DAP configuration utility (SPEC 20) is not available during ascent (OPS 1) or entry (OPS 3) and a request to bring it on screen under these conditions will be answered by 'Illegal entry'. Please refer to the DPS dictionary whether the operation you want to perform is legal in the circumstances. | * The selected item may not be legal in the current major mode / OPS. In general the software cannot perform all possible functions in all phases of the flight. For instance the DAP configuration utility (SPEC 20) is not available during ascent (OPS 1) or entry (OPS 3) and a request to bring it on screen under these conditions will be answered by 'Illegal entry'. Please refer to the DPS dictionary whether the operation you want to perform is legal in the circumstances. | ||