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Space Shuttle Avionics: Difference between revisions
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→Data transmission errors
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If the IDP cannot exchange information with a GPC, the DPS part of the screen appears crossed out to signal that it is no longer updated. In addition, the MEDS system throws a POLL ERROR message. | If the IDP cannot exchange information with a GPC, the DPS part of the screen appears crossed out to signal that it is no longer updated. In addition, the MEDS system throws a POLL ERROR message. | ||
[[File: | [[File:Poll_fail.jpg|600px|DPS screen with IDP poll error]] | ||
This can happen in two ways: Either there is no GPC available to support the requested major mode (for instance, in nominal launch configuration, no GPC runs system management software and hence any request to show SM DPS screens via the major mode switches leads to the error (since usually three or four GPCs run GNC software, it's unlikely that no GPC out of that redundant set of available). | This can happen in two ways: Either there is no GPC available to support the requested major mode (for instance, in nominal launch configuration, no GPC runs system management software and hence any request to show SM DPS screens via the major mode switches leads to the error (since usually three or four GPCs run GNC software, it's unlikely that no GPC out of that redundant set of available). | ||