How to load a custom waveform for use with DAQ voltage generation

I would appreciate some advice on how to take a custom waveform (just a modified triangle wave with pauses at the tops and bottoms) and use that to control the voltage output from a DAQ.
Some background: My intent is to use the waveform to control mirror scanning for a LADAR imaging application . Because our DAQ (NI-6251) only has one clock, it cannot update the X and Y channel voltages independently. I'm using a triangle wave to control both axes, which works fine for the X direction. However, to prevent the Y axis from incrementally steping up after every X pixel, I'd like to construct a waveform, similar to a step pyramid, so that the Y axis remains constant over the X sweep and only updates to the next row after all X pixels are collected.
I assume I can make the desired plot in excel, and then read it in somehow - but this is where I start to get fuzzy. Can any one point me to an example or tutorial on this?
Some other questions:
1. Do I needto worry about scaling? will my custom plot need to contain a specific number of points (perhaps the exact number of pixels in the image)?
2. If I change the image dimensions, will I need to revise the control waveform in the Y axis?
Thanks in advance,
jimmy

This thread didn't appear to go anywhere. I am trying to do something similar and was looking for help. I want to create a repeating output voltage wave based off the excel file attached(with times). Is there a way to have my program match the output voltage and time with the table attached on a repeat and send that signal to the output?
Thanks,
T
Attachments:
Sig Gen.xlsx ‏34 KB

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