Hello Cheve,
Thanks for using National Instruments forums! Answering your question, yes it is possible to control the POSIDYN 5000 with the XNET driver, just to let you know XNET is the software layer that allows specific hardware to execute CAN commands (as well as LIN and FlexRay) and performs all the communication between NI hardware and your application. For a better understanding you can check the CAN Loopback Test.vi within the Find Examples section in LabVIEW (Help --> Find Examples…).
Have you already thought about which HW platform you will use? Do you need portability with more than 1 POSIDYN driver or your system will just be mounted in a bench? If you can provide me with this information I will be glad to help you with a recommended hardware platform that fits your needs.
If you plan to use cDAQ the modules that you can use are the 9861 and 9862.
https://www.ni.com/en-us/support/model.ni-9861.html
https://www.ni.com/en-us/shop/model/ni-9862.html
Hope you find this information useful!
Luis CT