[fpga] Analog input configuration in NI 7965R

Hi all,

I have a NI FlexRIO (PXIe-7965R) FPGA card with an adapter module (NI 5733). I am using Labview real time 2012. My measurements are dominated with 60 Hz harmonic noise, which is very much likely due to ground loop. I am trying set my analog input channels in differnetial mode (as opposed to RSE, NRSE) in an attempt to overcome ground loop. I came across this link which explains how to configure  FPGA input channels -

http://digital.ni.com/public.nsf/allkb/08EF26D2E9041BC6862570E0001E442E

However, on opening the RIO device setup for my target, I found that there is no option to choose the channel configuration (as seen in the attached image). Does this mean that the analog channels are in differential mode by default? If not, how do I change it?

Any help will be greatly appreciated.