National Instruments PCI-6281, User Manual

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Chapter 5 Analog Output
Using a Digital Source
To use AO Pause Trigger, specify a source and a polarity. The source can be one of the following
signals:
• PFI <0..15>
• RTSI <0..7>
• PXI_STAR
The source also can be one of several other internal signals on your DAQ device. Refer to
Device
Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more information.
You also can specify whether the samples are paused when AO Pause Trigger is at a logic high
or low level.
Using an Analog Source
When you use an analog trigger source, the samples are paused when the Analog Comparison
Event signal is at a high level. Refer to the
Triggering with an Analog Source
section of
Chapter 11,
Triggering
, for more information.
Routing AO Pause Trigger Signal to an Output Terminal
You can route AO Pause Trigger out to RTSI <0..7>.
AO Sample Clock Signal
Use the AO Sample Clock (ao/SampleClock) signal to initiate AO samples. Each sample
updates the outputs of all of the DACs. You can specify an internal or external source for AO
Sample Clock. You also can specify whether the DAC update begins on the rising edge or falling
edge of AO Sample Clock.
Using an Internal Source
One of the following internal signals can drive AO Sample Clock:
• AO Sample Clock Timebase (divided down)
• Counter
n
Internal Output
A programmable internal counter divides down the AO Sample Clock Timebase signal.
Using an External Source
Use one of the following external signals as the source of AO Sample Clock:
• PFI <0..15>
• RTSI <0..7>
• PXI_STAR
• Analog Comparison Event (an analog trigger)