To connect the GX60 expansion unit to the SMARTDAC+ GX/GP series I installed the GX90EX expansion module in the GX/GP and reconfigured, but the expansion unit is not recognized. What should I do?

1) Install the GX90EX expansion module into one of the following slots.
  GX10, GP10: Slot 2 (1st slot on the left when facing the back)
  GX20, GP20: Slot 9 (1st slot on the left, upper row, when facing the back)
2) Set the GX90EX expansion module's dip switches as follows.
  No. 8 (master I/O operation) = ON, No. 1-4 (unit no.) = All OFF