Chapter 3
Analog Output
3-10
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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
Chapter 10,
, for more information on analog triggering.
Outputting the AO Start Trigger Signal
You can configure the PFI 6/AO START TRIG pin to output the
ao/StartTrigger signal. The output pin reflects the ao/StartTrigger signal
regardless of what signal you specify as its source.
The output is an active high pulse. Figure 3-7 shows the timing behavior of
the PFI 6/AO START TRIG pin configured as an output.
Figure 3-7.
PFI 6/AO START TRIG Timing Behavior
The PFI 6/AO START TRIG pin is configured as an input by default.
AO Pause Trigger Signal
You can 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.
The ao/PauseTrigger does not stop a sample that is in progress. The pause
does not take effect until the beginning of the next sample. This signal is
not available as an output.
Using a Digital Source
To use ao/Pause Trigger, specify a source and a polarity. The source can be
an external signal connected to any PFI or RTSI <0..6> pin. The source can
also 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 8.x Help
for more information.
Also, specify whether the samples are paused when ao/PauseTrigger is at a
logic high or low level.
t
w
t
w
= 25 to 50 ns
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