Command Protocol
CIDP does not directly command SI
All commands are from ground
- SCU strips overhead and determines recipient
- SCU forwards command to appropriate 1553 subaddress
- Real time commands are 64 words maximum (one 1553 frame)
- All commands have time tag
- Time Tag = 0 Real time command
- Time Tag > 0 Stored Command
- CIDP pulls command from 1553 interface and forwards to SI
SI stored command time tag is parsed by CIDP
- CIDP stores SI commands in its stored command queue
- When time tag expires, CIDP forwards commands to SI
Command formats are defined by each SI and provided to ground segment