An acquisition that uses a start trigger (but not a reference trigger) is sometimes referred to as a posttriggered acquisition. That is, samples are measured only after the trigger.
When you are using an internal sample clock, you can specify a delay from the start trigger to the first sample.
To use the Start Trigger signal with a time source, configure a specific time in NI-DAQmx. Refer to Timestamps and Time Triggering in the NI-DAQmx Help for more information on accessing time-based features in the NI-DAQmx API.
The source also can be one of several other internal signals on the cRIO controller. Refer to the Device Routing in MAX topic in the NI-DAQmx Help or the LabVIEW Help for more information.
You can route DI Start Trigger to any output PFI terminal. The output is an active high pulse.