Chapter 6 Digital I/O
X Series User Manual 6-2 ni.com
Figure 6-1. X Series Digital I/O Circuitry
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.
DO Sample Clock
DO Waveform
Generation FIFO
DO.x Direction Control
Static DI
DI Sample Clock
DI Change
Detection
I/O Protection
Weak Pull-Down
P0.x
Static DO
Buffer
DI Waveform
Measurement
FIFO
Filter
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