Chapter 4 Analog Input
X Series User Manual 4-38 ni.com
Using a Digital Source
To use AI Reference 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>
•PXI_STAR
• Change Detection Event
•Counter n Internal Output
• DI Reference Trigger (di/ReferenceTrigger)
• DO Start Trigger (do/StartTrigger)
• AO Start Trigger (ao/StartTrigger)
The source also can be one of several 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 stops on the
rising edge or falling edge of AI Reference Trigger.
Using an Analog Source
When you use an analog trigger source, the acquisition stops on the
first rising edge of the Analog Comparison Event signal.
Routing AI Reference Trigger Signal to an Output Terminal
You can route AI Reference Trigger out to any PFI <0..15>, RTSI <0..7>,
PXI_Trig <0..7>, or PXIe-DSTARC terminal.
All PFI terminals are configured as inputs by default.
AI Pause Trigger Signal
Use the AI Pause Trigger (ai/PauseTrigger) signal to pause and resume a
measurement acquisition. The internal sample clock pauses while the
external trigger signal is active and resumes when the signal is inactive.
You can program the active level of the pause trigger to be high or low, as
shown in Figure 4-24. In the figure, T represents the period, and A
represents the unknown time between the clock pulse and the posttrigger.
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