Chapter 5
Analog Output
5-8
ni.com
•
ai/ReferenceTrigger
•
ai/StartTrigger
•
PXI_STAR
The source also can be one of several internal signals on your DAQ device.
Refer to
Device Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW
Help
in version 8.0 or later for more information.
You also can specify whether the waveform generation begins on the rising
edge or falling edge of ao/StartTrigger.
Using an Analog Source
When you use an analog trigger source, the waveform generation begins on
the first rising edge of the Analog Comparison Event signal. Refer to the
Triggering with an Analog Source
section of Chapter 11,
, for
more information.
Routing AO Start Trigger Signal to an Output
Terminal
You can route ao/StartTrigger out to any PFI <0..15> or RTSI <0..7>
terminal.
The output is an active high pulse.
PFI terminals are configured as inputs by default.
AO Pause Trigger Signal
Use the AO Pause trigger signal (ao/PauseTrigger) to mask off samples in
a DAQ sequence. That is, when ao/PauseTrigger is active, no samples
occur.
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 your sample clock is the
onboard clock, the generation resumes as soon as the pause trigger is
deasserted, as shown in Figure 5-4.
