Hey Paul,
Unfortunately, we do not offer a driver that will support the PCI-GPIB and the ENET at the same time. In order to use the ENET you will need to use NI-488.2 Version 1.4 (http://digital.ni.com/softlib.nsf/websearch/67f3a445bc3b87c3862569f2005855d9?opendocument).
We recommend you do not install both of these drivers at the same time, because each driver was designed to run independently and some of the files would be overwritten.
However, the functions will be the same for both drivers, so the code you�re developing should be interchangeable. There are a few additional functions the ENET supports, but they are just used to get information about the ENET and do not need to be in your application. The only difference is that you will need to link t
he code to a different library when it is compiled. This information is located inside of the getting started guide.
http://www.ni.com/pdf/manuals/322989a.pdf
I hope this helps out.
JoshuaP
National Instruments