I am looking to use Visualc++ (not visualstudio) without measurement studio to drive my pci 6221 card to output a range of voltages. Is there an instruction manual for using c++ to program the card? Also where can I find a list of the functions offered by the API in c++? The examples in the DAQmx folder was not too helpful as I could not fully understand the reasoning behind some of the code. Ideally, could someone point me in the direction where I can find a general outline of the code required to do this?
You can navigate to your NI folder in your Start menu and find the NI-DAQ section where there is a Text-Based Code Support folder. In there you should be able to see the "NI-DAQmx C Reference Help" manual. For example, if you are using Windows XP, you can go to:
Start> All Programs> National Instruments> NI-DAQ> Text-Based Code Support> NI-DAQmx C Reference Help.
This has enough information for all DAQmx functions.
There are also a lot of articles and examples here, on our website. A quick search with a few good keywords will give you a lot of great results to read up on.