Chapter 6 Digital I/O
X Series User Manual 6-12 ni.com
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 DI Reference Trigger Signal to an Output
Terminal
You can route DI 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.
DI Pause Trigger Signal
You can use the DI Pause Trigger (di/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 6-6. In the figure, T represents the period, and A represents
the unknown time between the clock pulse and the posttrigger.
Figure 6-6. Halt (Internal Clock) and Free Running (External Clock)
DI Sample Clock
DI Pause Trigger
T
A
DI External Sample Clock
DI Pause Trigger
Halt. Used on Internal Clock
Free Running. Used on External Clock
T – A
DI Sample Clock
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