Di Sample Clock Signal; Using An Internal Source; Using An External Source - National Instruments DAQ X Series User Manual

Chapter 6 Digital I/O

DI Sample Clock Signal

The device uses the DI Sample Clock (di/SampleClock) signal to sample the
Port 0 terminals and store the result in the DI waveform acquisition FIFO.
You can specify an internal or external source for DI Sample Clock. You
also can specify whether the measurement sample begins on the rising edge
or falling edge of DI Sample Clock.
If the DAQ device receives a DI Sample Clock when the FIFO is full,
it reports an overflow error to the host software.

Using an Internal Source

To use DI Sample Clock with an internal source, specify the signal source
and the polarity of the signal. The source can be any of the following
signals:
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Several other internal signals can be routed to DI Sample Clock through
internal routes. Refer to Device Routing in MAX in the NI-DAQmx Help or
the LabVIEW Help for more information.

Using an External Source

You can route any of the following signals as DI Sample Clock:
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You can sample data on the rising or falling edge of DI Sample Clock.
X Series User Manual
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DI Sample Clock (di/SampleClock)
DO Sample Clock (do/SampleClock)
AI Sample Clock (ai/SampleClock)
AI Convert Clock (ai/ConvertClock)
AO Sample Clock (ao/SampleClock)
Counter n Sample Clock
Counter n Internal Output
Frequency Output
DI Change Detection output
PFI <0..15>
RTSI <0..7>
PXI_STAR
PXIe-DSTAR<A,B>
Analog Comparison Event (an analog trigger)
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