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Chapter 2 Digital I/O
You might use DO Sample Clock Timebase if you want to use an external sample clock signal,
but need to divide the signal down. If you want to use an external sample clock signal but do not
need to divide the signal, then you should use DO Sample Clock rather than DO Sample Clock
Timebase.
DO Start Trigger Signal
Use the DO Start Trigger (do/StartTrigger) signal to initiate a waveform generation. If you do
not use triggers, you can begin a generation with a software command.
Retriggerable DO
The DO Start Trigger can also be configured to be retriggerable. The timing engine will generate
the sample clocks for the configured generation in response to each pulse on a DO Start Trigger
signal.
The timing engine ignores the DO Start Trigger signal while the clock generation is in progress.
After the clock generation is finished, the timing engine waits for another start trigger to begin
another clock generation. Figure 2-9 shows a retriggerable DO of four samples.
Figure 2-9. Retriggerable DO
Using a Digital Start Trigger
To use DO Start Trigger, specify a source and an edge. You can route many signals to DO Start
Trigger Signal. To view the complete list of possible routes, see the Device Routes tab in MAX.
Refer to Device Routing in MAX in the NI-DAQmx Help or the LabVIEW Help for more
information.
Waveform generation can be specified to begin either on the rising- or falling-edge of DO Start
Trigger.
Routing DO Start Trigger Signal to an Output Terminal
DO Start Trigger can be routed out to any RTSI <0..7>, PFI <0..39>, PXI_Trig <0..7>, or
PXIe-DSTARC terminal. The output is an active high pulse. PFI terminals are configured as
inputs by default.
DO Start Trigger
DO Sample Clock
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