In order to use digital triggering with any task in a CompactDAQ (cDAQ) chassis, you must have a parallel digital input module in order to gain access to the Programmable Function Interface (PFI) lines they provide.
To learn more about how to use a digital trigger in a task and how to configure it refer to NI-DAQmx Data Acquisition Triggering Techniques Using LabVIEW.
Futher information can be found the documentation avaiable for each device: Products Manuals: CompactDAQ User Manuals
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