In Example Finder, there's a pretty good example on how to do this. To open Example Finder, launch LabVIEW and select Find Examples.. In the window that appears, you'll have to navigate throughthe following folders.
Hardware Input & Output >> DAQmx >> Analog Measurements >> Voltage >> Acq&Graph Voltage-Int Clk-HW Trig Restarts.
This example uses an analog input trigger, but you can change it to digital edge by selecting the menu as seen below. Be sure to view the detailed help on this DAQmx function to best understand its role.
Hope that helps!
