Chapter 4 Analog Input
X Series User Manual 4-36 ni.com
Using a Digital Source
To use AI Start Trigger with a digital source, specify a source and an edge.
The source can be any of the following signals:
• PFI <0..15>
•RTSI <0..7>
•Counter n Internal Output
•PXI_STAR
• Change Detection Event
• AO Start Trigger (ao/StartTrigger)
• DI Start Trigger (di/StartTrigger)
• DO Start Trigger (do/StartTrigger)
The source also can be one of several other internal signals on your DAQ
device. Refer to Device Routing in MAX in the NI-DAQmx Help or the
LabVIEW Help for more information.
You also can specify whether the measurement acquisition begins on the
rising edge or falling edge of AI Start Trigger.
Using an Analog Source
When you use an analog trigger source, the acquisition begins on the
first rising edge of the Analog Comparison Event signal.
Routing AI Start Trigger to an Output Terminal
You can route AI Start Trigger out to any PFI <0..15>, RTSI <0..7>, or
PXIe-DSTARC terminal. The output is an active high pulse. All PFI
terminals are configured as inputs by default.
The device also uses AI Start Trigger to initiate pretriggered DAQ
operations. In most pretriggered applications, a software trigger generates
AI Start Trigger. Refer to the AI Reference Trigger Signal section for a
complete description of the use of AI Start Trigger and AI Reference
Trigger in a pretriggered DAQ operation.
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