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DO Start Trigger Signal

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    Last Modified: August 30, 2018

    Use the DO Start Trigger signal to initiate a waveform generation. If you do not use triggers, you can begin a generation with a software command. If you are using an internal sample clock, you can specify a delay from the start trigger to the first sample. For more information, refer to the NI-DAQmx Help.

    Using a Time Source

    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.

    Using a Digital Source

    To use DO Start Trigger, specify a source and a rising or falling edge. The source can be one of the following signals:
    • A pulse initiated by host software

    • Any PFI terminal

    • AI Reference Trigger

    • AI Start Trigger

    The source also can be one of several 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 also can specify whether the waveform generation begins on the rising edge or falling edge of DO Start Trigger.

    Routing DO Start Trigger Signal to an Output Terminal

    You can route DO Start Trigger to any output PFI terminal. The output is an active high pulse.


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