Chapter 4 Analog Input
© National Instruments 4-61 X Series User Manual
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 4-33. In the figure, T represents the period, and A
represents the unknown time between the clock pulse and the posttrigger.
Figure 4-33. Halt (Internal Clock) and Free Running (External Clock)
Using a Digital Source
To use AI Pause Trigger, specify a source and a polarity. The source can be
any of the following signals:
• PFI <0..15>
•RTSI <0..7>
•PXI_STAR
•Counter n Internal Output
AI Sample Clock
AI Pause Trigger
T
A
AI External Sample Clock
AI Pause Trigger
Halt. Used on Internal Clock
Free Running. Used on External Clock
T – A
AI Sample Clock
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