Additional DF-224 Processing

Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.stsci.edu/hst/training/events/HowHSTWorks/SSD990225/tsld020.htm
Äàòà èçìåíåíèÿ: Unknown
Äàòà èíäåêñèðîâàíèÿ: Sun Dec 23 18:43:44 2007
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SIC&DH Interface
- Communications between DF-224 and NSSC-I is via PITs (Processor Interface Tables)
- One table goes each way each half second
- SSM PIT tells NSSC-I about DF-224 and spacecraft
  - Safing directions
  - Spacecraft time
  - Take data flag
  - Maneuver request accepted
  - Maneuver information
  - Guide star information
- SIC&DH PIT tells DF-224 about SIs
  - Requests V2-V3 offsets
  - Requests STR/SSR start/stop
  - Indicates that a payload safing has been initiated
- Protocol indicates to each computer that the other is alive
  - DF-224 safes SIC&DH and SIs if it does not receive PIT
  - NSSC-I safes SIs if it does not receive PIT

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Additional DF-224 Processing

SIC&DH Interface