It's certainly possible to generate 2 or more lines, but it may not be simple, and the 1-line example may not readily extend to multiple channels. (Don't have LV nearby to look at code now.)
I have not personally used the digital waveform datatype and vi's beyond some brief experimentation. When I needed to interleave multiple channels of digital transition timing info, I hoped the digital waveform vi's would have some neat capabilities under the hood to make it easy. I didn't find any. Instead I figured out how to do it from raw arrays of digital states. It isn't too hard to get nearly right, but is kinda tricky to get exactly right for all circumstances. Sorry, all I can share is advice: be sure to test the behavior thoroughly with various special cases. For example:
1. Signal 1 has 1 or more transitions before signal 2's first transition. And vice versa.
2. Signal 1 has 1 or more transitions after signal 2's last transition. And vice versa.
3. Signals 1 and 2 have their first transition at the same instant. Then try coincident last transitions. Then try coincident intermediate transitions.
4. Signals 1 and 2 have many or all transitions at the same instant.
5. There are probably some others that aren't coming immediately to mind. Also, try different combinations of the scenarios above.
-Kevin P.
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