National Instruments DAQ X Series User Manual page 106

Chapter 4 Analog Input
When the reference trigger occurs, the DAQ device continues to write
samples to the buffer until the buffer contains the number of posttrigger
samples desired. Figure 4-32 shows the final buffer.
Using a Digital Source
To use AI Reference Trigger with a digital source, specify a source and an
edge. The source can be any of the following signals:
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The source also can be one of several 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 measurement acquisition stops on the
rising edge or falling edge of AI Reference Trigger.
Using an Analog Source
When you use an analog trigger source, the acquisition stops on the
first rising edge of the Analog Comparison Event signal.
X Series User Manual
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Reference Trigger
Pretrigger Samples
Complete Buffer
Figure 4-32. Reference Trigger Final Buffer
PFI <0..15>
RTSI <0..7>
PXI_STAR
PXIe-DSTAR<A,B>
Change Detection Event
Counter n Internal Output
DI Reference Trigger (di/ReferenceTrigger)
AO Start Trigger (ao/StartTrigger)
DO Start Trigger (do/StartTrigger)
4-60
Posttrigger Samples
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