Chapter 6 Digital I/O
© National Instruments 6-9 X Series User Manual
engine waits for another Start Trigger to begin another clock generation.
Figure 6-4 shows a retriggerable DI of four samples.
Figure 6-4. Retriggerable DI
Note
Waveform information from LabVIEW will not reflect the delay between triggers.
They will be treated as a continuous acquisition with constant t0 and dt information.
Reference triggers are not retriggerable.
Using a Digital Source
To use DI Start 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>
•Counter n Internal Output
•PXI_STAR
• Change Detection Event
• AI Start Trigger (ai/StartTrigger)
• AO Start Trigger (ao/StartTrigger)
• DO Start Trigger (do/StartTrigger)
The source also can be one of several other 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 begins on the
rising edge or falling edge of DI Start Trigger.
DI Start Trigger
DI Sample Clock
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