Generating analog output with USB DAQ 6009

Hello All,
I am trying to generate a single square wave with my USB DAQ 6009. I am using "On demand"
signal type which is the only signal type not giving error. And I defined my square wave
conveniently with the built in function generator on simulated signals. My program runs OK
but I cannot read the wave form that I supposed to. Please see the attached pictures for my
program and how I connected the ports on the DAQ to read the generated signal back.
Any help would be appreciated. And if this is not practical with USB DAQ 6009, I am open to
hear any other option I have, like other affordable DAQ cards.
Thank you,
SC