Yamaha DTXpress/DTXplorer/DTXtreme

Hello all. Newbie here with a new DTXpress IV V2 (special). I'm having
trouble getting any sound out of the foot pedal of the RHH135 HiHat.
It's on the HS650A stand that came with the kit. I have verified I
have the HiHat and HiHat Controller cables connected correctly. I get
sound when I strike the HiHat but nothing when using the foot pedal.
What am I missing?

I can't seem to find anything in the manual that explains how to
verify the foot pedal should be set up in the module. 

I have the RHH135 resting on the stand base. Is that correct?

Any and all help will be much appreciated!

Thanks in advance.

DH