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Chapter 5
Analog Output
Using a Digital Source
To use ao/StartTrigger, specify a source and an edge. The source can be one
of the following signals:
•
•
•
•
•
•
Note Refer to the NI 6238/6239 Specifications for the minimum allowable pulse width
and the propagation delay of PFI <0..5>.
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 8.x Help for more information.
You also can specify whether the waveform generation begins on the rising
edge or falling edge of ao/StartTrigger.
Routing AO Start Trigger Signal to an Output
Terminal
You can route ao/StartTrigger out to any output PFI <6..9> or RTSI <0..7>
terminal.
The output is an active high pulse.
PFI <0..5> terminals are fixed inputs. PFI <6..9> terminals are fixed
outputs.
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
NI 6238/6239 User Manual
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A pulse initiated by host software
Input PFI <0..5>
RTSI <0..7>
ai/ReferenceTrigger
ai/StartTrigger
PXI_STAR
5-6
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