PXI-6537 Digital Logic Family voltages are not changing.

I have an application that is using a PXI-1085 chassis with a PXI-6537 x 2 that will need ports at a different logic levels  of 2.5V and 3.3V.  After setting up a test application to prove i can change the digital family logic for each port i get a constant 3.3V.  I went into max and tried using the "Configure" for each card and didn't get any change as well.  The DAQmx version i'm using is 9.5.5 with 2012 Dev Suite (LV 2012). 

Attached is my example test VI for 4 different ports in which i need a different logic levels.

What can't i change the logic level of this card?

THanks,