There *may* be a way, but it'll be awkward at best and I'm not honestly sure it'll work.
It starts with understanding how to be a little manipulative with the way you read from a DAQmx task buffer. Here's a posted snippet of mine that shows how you can "back up" and read older data.
So my general idea involves:
1. Doing a first read that's a scaled waveform
2. Keep cumulative track of total # samples read. (Don't just query the task, keep count for yourself).
3. Use the method from the link above to "back up" and read the recent samples in unscaled form
4. Change the properties to make Offset=0 again.
5. Go back to #1 for the next chunk of data.
Something like that, I may have missed a detail or two. And I don't honestly know if it'll work out, but maybe it's worth a try.
Other ideas are to read unscaled only but also read scaling params so you can do the scaling yourself. But that method doesn't bring you some of the handy metadata embedded in waveforms.
-Kevin P
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