Digital Input Data Acquisition Methods; Software-Timed Acquisitions - National Instruments DAQ X Series User Manual

Chapter 6 Digital I/O
DO Waveform
Generation FIFO
DO Sample Clock
Static DO
Buffer
DO.x Direction Control
DI Waveform
Measurement
FIFO
DI Sample Clock
DI Change
Detection
The DIO terminals are named P0.<0..31> on the X Series device I/O
connector.
The voltage input and output levels and the current drive levels of the DIO
lines are listed in the specifications of your device.

Digital Input Data Acquisition Methods

When performing digital input measurements, you either can perform
software-timed or hardware-timed acquisitions.

Software-Timed Acquisitions

With a software-timed acquisition, software controls the rate of the
acquisition. Software sends a separate command to the hardware to initiate
each acquisition. In NI-DAQmx, software-timed acquisitions are referred
to as having on-demand timing. Software-timed acquisitions are also
referred to as immediate or static acquisitions and are typically used for
reading a single sample of data.
X Series User Manual
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Static DI
Filter
Figure 6-1. X Series Digital I/O Circuitry
6-2
P0.x
I/O Protection
Weak Pull-Down
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