© National Instruments | 3-5
NI cDAQ-917x User Manual
AO Pause Trigger Signal
Use the AO Pause Trigger signal (ao/PauseTrigger) to mask off samples in a DAQ sequence.
When AO Pause Trigger is active, no samples occur, but AO Pause Trigger does not stop a
sample that is in progress. The pause does not take effect until the beginning of the next sample.
When you generate analog output signals, the generation pauses as soon as the pause trigger is
asserted. If the source of the sample clock is the onboard clock, the generation resumes as soon
as the pause trigger is deasserted, as shown in Figure 3-2.
Figure 3-2. AO Pause Trigger with the Onboard Clock Source
If you are using any signal other than the onboard clock as the source of the sample clock, the
generation resumes as soon as the pause trigger is deasserted and another edge of the sample
clock is received, as shown in Figure 3-3.
Figure 3-3. AO Pause Trigger with Other Signal Source
Using a Digital Source
To use AO Pause Trigger, specify a source and a polarity. The source can be a PFI signal or one
of several other internal signals on the cDAQ chassis.
You also can specify whether the samples are paused when AO Pause Trigger is at a logic high
or low level. Refer to the Device Routing in MAX topic in the NI-DAQmx Help or the LabVIEW
Help for more information.
Using an Analog Source
Some C Series I/O modules can generate a trigger based on an analog signal. In NI-DAQmx, this
is called the Analog Comparison Event, depending on the trigger properties.
Pause Trigger
Sample Clock
Pause Trigger
Sample Clock
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