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Chapter 6
Digital I/O
Using a Digital Source
To use DO Start Trigger, specify a source and an edge. The source can be one of the following
signals:
•
A pulse initiated by host software
•
PFI <0..15>
•
RTSI <0..7>
•
AI Reference Trigger (ai/ReferenceTrigger)
•
AI Start Trigger (ai/StartTrigger)
•
AO Start Trigger (ao/StartTrigger)
•
Counter
n
Internal Output
•
DI Start Trigger (di/StartTrigger)
•
DI Reference Trigger (di/ReferenceTrigger)
•
Change Detection Event
•
PXI_STAR
•
PXIe_DSTAR<A,B>
The source can also 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 can also specify whether the waveform generation begins on the rising edge or falling edge
of DO Start Trigger.
Using an Analog Source
When you use an analog trigger source, the waveform generation begins on the first rising or
falling edge of the Analog Comparison Event signal. Refer to the
, for more information.
Routing DO Start Trigger Signal to an Output Terminal
You can route DO Start Trigger out to any PFI <0..15>, RTSI <0..7>, or PXIe_DSTARC
terminal.
The output is an active high pulse. PFI terminals are configured as inputs by default.
DO Pause Trigger Signal
Use the DO Pause Trigger (do/PauseTrigger) signal to mask off samples in a DAQ sequence.
That is, when DO Pause Trigger is active, no samples occur.
DO Pause Trigger does not stop a sample that is in progress. The pause does not take effect until
the beginning of the next sample.
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