Dear Deathdog,
Thanks so much for your posting on NI forums.
SCXI-1349 is required for SCXI-1180 and not related to the chassis and dosen't communicated with the chassis backplane, it is only related to SCXI-1180.
you can find pinouts of the SCXI-1180 in the following link.
SXCI-1180 pinouts
eyad,
automation engineer.