1553 Interface

• Interface uses multiple subaddresses to coordinate data transfers

• Time/Ephemeris Frame Subaddress

  • SCU sends T/E frame every 100 msec.
  • Time accurate to 100 usec
  • New attitude information (quaternions and rate) every 200 msec.

• Sixteen Source Data Subaddresses

  • Ping Pong buffer - changes when CIDP receives T/E frame
  • CIDP fills 8 subaddresses with data every 100 msec
  • SCU reads opposite 8 subaddresses every 100 msec

• Two HKTEL Subaddresses

  • Ping Pong Buffer
  • Read every 200 msec

• Seven Command Subaddresses

  • One for each SI
  • One for CIDP

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