Chapter 6 Digital I/O
© National Instruments 6-11 X Series User Manual
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 6-5 shows the final buffer.
Figure 6-5. Reference Trigger Final Buffer
Using a Digital Source
To use DI 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
• AI Reference Trigger (ai/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 or falling edge or falling edge of DI Reference Trigger.
Reference Trigger
Pretrigger Samples
Complete Buffer
Posttrigger Samples
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