Unfortunately you can only configure a trigger for a single channel. You could, in software, create a multiple-channel software trigger, but it will not be nearly as efficient.
Here is what you could do. You could call the the AI Start VI and AI Read VI in a while loop like the "Acquire-N-Multi-Analog Software Trig VI" but you would not be able to use the conditional retrieval part of the code. Initially, you could read only a few values from each channel and be comparing those values to each individual threshold within the loop. When all of the values have reached the thresholds, you could change (increase) the amount of values being read by AI Read.
This method would always be reading from the channels, but would not be returning a lot of data until all of
the channels have reached their threshold. Just a suggestion. I hope this helps.
Regards,
Todd D.
Applications Engineering
National Instruments
