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NI cDAQ-9181/9184/9188/9191 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.

Pause Trigger

Sample Clock

Pause Trigger

Sample Clock

National Instruments NI cDAQ-9181 User Manual

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