Chapter 6 Digital I/O
X Series User Manual 6-6 ni.com
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:
• 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
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:
• PFI <0..15>
•RTSI <0..7>
•PXI_STAR
• Analog Comparison Event (an analog trigger)
You can sample data on the rising or falling edge of DI Sample Clock.
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