Using A Digital Source; Outputting The Ao Start Trigger Signal; Ao Pause Trigger Signal - National Instruments 6711 User Manual

Chapter 3 Analog Output

Using a Digital Source

To use ao/StartTrigger, specify a source and an edge. The source can be an external signal
connected to any PFI or RTSI <0..6> pin. The source can also be one of several internal signal
on your DAQ device. Refer to Device Routing in MAX in the NI-DAQmx Help or the
LabVIEW Help for more information.
Figure 3-4 shows the timing requirements of the ao/StartTrigger digital source.
Rising-Edge
Falling-Edge

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 3-5 shows the timing behavior of the PFI 6/AO START
TRIG pin when the pin is an output.
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.
3-6 | ni.com
Figure 3-4. ao/StartTrigger Timing Requirements
Polarity
Polarity
Figure 3-5. PFI 6/AO START TRIG Timing Behavior
t
w
t = 10 ns minimum
w
t w
t w = 50 –100 ns