Chapter 4 Analog Input
X Series User Manual 4-60 ni.com
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.
Figure 4-32. Reference Trigger 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:
• PFI <0..15>
•RTSI <0..7>
•PXI_STAR
• Change Detection Event
•Counter n Internal Output
• DI Reference Trigger (di/ReferenceTrigger)
• AO Start Trigger (ao/StartTrigger)
• DO Start Trigger (do/StartTrigger)
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.
Reference Trigger
Pretrigger Samples
Complete Buffer
Posttrigger Samples
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