Robert,
I have verified that the dip switch settings on your unit are exactly the same as the GPIB-232CV, whose manual you can find linked below:
http://www.ni.com/pdf/manuals/320109.pdf
The only other switch configuration is for the jumpers W4, W5, and W6 on the 422 unit. These are set shorting pins 2-3 from the factory, but should all 3 be changed to short pins 1-2 if you desire the unit to be compatible with the Macintosh serial port. (I'm assuming that this is the Macintosh serial port circa 1993).
Thanks for your patience,
Scott B.
Applications Engineering
National Instruments