Hi Ron,
I couldn't find much information on the GPIB-422CV since it is obsolete. However, I did find one
KnowledgeBase that does discuss some dip switch settings. It also has a link to the GPIB-232CV User Manual which is very similar and should operate much the same as the 422CV. It discusses setup and operation, which might be a useful guide to using the 422CV.
As far as the software, you should be able to use anything that will communicate via a serial port. Just make sure you are formatting the commands correctly. The manual discusses more about the different operations.
Hope this helps!
Adam W
Applications Engineering
National Instruments