I want to do Anaolg output with a 6704 card under Linux (preferably with gnu C++). To my understanding, EDaq only works with E series cards, and the Comedi drivers work for Analog In only (in any event, 6704 was not listed in their supported hardware section). Do I have any other options?
Unfortunately, National Instruments does not provide a driver for the 6704 card under the Linux enviroment. You could try and use Register Level Programming (RLP) to program the board in Linux. I have attached a preliminary RLP document for the 6704 and more information can be found on the National Instruments website on how to program various NI DAQ cards via RLP at www.ni.com/support/daqsupp.htm
The following disclaimer comes attached to the RLP for 6704 word document:
Disclaimer: This document is not guaranteed accurate! It is a preliminary copy of the manual. Use this document in conjunction with:
"PCI E-Series register level programming manual" http://www.ni.com/pdf/manuals/341079b.pdf and possibly