Hello,
First I believe from your post that you are using Traditional DAQ. However it looks like you are just starting your application so I would recommend that you use DAQmx. Depending on how comfortable you are with this, you can use the DAQ Assistant or the DAQmx VIs. There is a lot of useful getting started information in the online
Getting Started with NI-DAQmx tutorials.
If you decide to use the DAQmx VIs, I would look at Cont Gen Voltage Wfm-Int Clk.vi. You can find the latest version of NI-DAQmx for your hardware
here. I hope this provides you with a little more information. If you have any questions please let me know.
Regards,
Jesse O.
Applications Engineering
National Instruments
Jesse O. | National Instruments R&D