Found this on the NCE site with regards to AIUs:
Valid cab addresses (for cabs in) a Powercab system are 2,3,4, or 5. Total of 4 actual cabs. 6 and 7 are unused. 8,9 and 10 can be used for other cab devices (AIU,USB) only.
?Valid cab addresses (for cabs) in an SB5 system are 2,3,4,5, 6 and 7. Total of 6 actual cabs. ?8,9 and 10 can be used for other cab devices (AIU,USB) only.
?If the AIU cab address is higher than 10 it will not work due to the limits of the command stations.
