Chapter 3 Analog OutputE Series User Manual 3-10 ni.comUsing an Analog SourceWhen you use an analog trigger source, the waveform generation begins onthe first rising edge of the Analog Comparison Event signal. Refer toChapter 10, Triggering, for more information on analog triggering.Outputting the AO Start Trigger SignalYou can configure the PFI 6/AO START TRIG pin to output theao/StartTrigger signal. The output pin reflects the ao/StartTrigger signalregardless of what signal you specify as its source.The output is an active high pulse. Figure 3-7 shows the timing behavior ofthe PFI 6/AO START TRIG pin configured as an output.Figure 3-7. PFI 6/AO START TRIG Timing BehaviorThe PFI 6/AO START TRIG pin is configured as an input by default.AO Pause Trigger SignalYou can use the AO Pause trigger signal (ao/PauseTrigger) to mask offsamples in a DAQ sequence. That is, when ao/PauseTrigger is active, nosamples occur.The ao/PauseTrigger does not stop a sample that is in progress. The pausedoes not take effect until the beginning of the next sample. This signal isnot available as an output.Using a Digital SourceTo use ao/Pause Trigger, specify a source and a polarity. The source can bean external signal connected to any PFI or RTSI <0..6> pin. The source canalso be one of several other internal signals on your DAQ device. Refer toDevice Routing in MAX in the NI-DAQmx Help or the LabVIEW 8.x Helpfor more information.Also, specify whether the samples are paused when ao/PauseTrigger is at alogic high or low level.t wt w = 25 to 50 ns
