I think this may be what you're looking for. It's on CAI's web site, but it's not located where one is probably most likely to look for it.
http://www.cambridge-aero.com/pdf%20files/
Pnav_Data_Wiring.pdf
Wouldn't be a bad thing if CAI were to add a page with a long list of links to all of their .PDF files that are available.