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Chapter 3
Analog Output
AO Pause Trigger Signal
E Series User Manual
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, Triggering, 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.
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
= 25 to 50 ns
w
3-10
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