The Contec cards were hooked to the Opto 22 stuff. Maybe purchasing a Contec card it the easiest way. Otherwise, you will have to find someone to write a plugin for the ADLink cards. I would, but I just don't have the time right now as I'm busy busy busy with Mach 4 at the moment. If you get a Contec card, make sure that it is supported by the plugin. (I think it is in the docs).
Steve