What you want to need with Ni 8502 in PXI RT?
What kind of PXI you are want to use?
PXI Modules (PXIe-8521, PXIe-8522, and PXIe-8523) do not support the Phar Lap ETS real-time operating system that installs with the LabVIEW Real-Time Module.
Not sure if the answer is yes or no, but the answer is definitely NO for a new system. If this is just to test something really quick, even if it's not supoprted, you may be able to get it to work. I would just install XNET to the PXI controller and see if it populates. If it doesn't, i would spend 30 minutes Google Fooing and SSHing and then I'd give up.
Pharlap support is ending this year so please don't start a new system with it. Bite the bullet and invest in new hardware. Save headaches down the line.