USB document scanner setup

I have been trying to get this to work but I am posting here because I must be an idiot. I have a xerox DocuMate 3125 which is a twain driver scanner. I have the eval of wyse tcx installed and that seems to be working right, usb drives and a local usb printer work good. But it doesn't seem like the scanner is showing up in the os(passing through). I have installed the xerox driver and one touch software on the server.

What is the correct process for getting scanners working? Am I even going down the right path? Documentation is very vague when it comes to setting up scanners.

Server 2008 R2 shared session-VM on hyper-v
Wyse D10D and R10L clients, OS version 8.0037

Any help would be greatly appreciated
Thanks
Kevin