National Instruments Eight-slot USB Chassis NI cDAQ-9172 - Manual (Page 33)

© National Instruments Corporation 33 NI cDAQ-9172 User Guide and Specifications
AO Pause Trigger Signal
Use the AO Pause trigger signal (ao/PauseTrigger) to mask off samples in
a DAQ sequence. When ao/PauseTrigger is active, no samples occur, but
ao/PauseTrigger 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 13.
Figure 13. ao/PauseTrigger 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 14.
Figure 14. ao/PauseTrigger with Other Signal Source
Using a Digital Source
To use ao/PauseTrigger, specify a source and a polarity. The source can be
a PFI signal or one of several other internal signals on the NI cDAQ-9172
chassis.
You also can specify whether the samples are paused when ao/PauseTrigger
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 in version 8.0 or later for more
information.
Pause Trigger
Sample Clock
Pause Trigger
Sample Clock