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 inp
u
t and o
u
tp
u
t levels and the c
u
rrent drive levels of the DIO
lines are listed in the specifications of yo
u
r device.
Digital Input Data Acquisition Methods
When performing digital inp
u
t meas
u
rements, yo
u
either can perform
software-timed or hardware-timed acq
u
isitions.
Software-Timed Acquisitions
With a software-timed acq
u
isition, software controls the rate of the
acq
u
isition. Software sends a separate command to the hardware to initiate
each acq
u
isition. In NI-DAQmx, software-timed acq
u
isitions are referred
to as having on-demand timing. Software-timed acq
u
isitions are also
referred to as immediate or static acq
u
isitions and are typically
u
sed for
reading a single sample of data.
DO
Sa
mple Clock
DO W
a
veform
Gener
a
tion FIFO
DO.
x
Direction Control
S
t
a
tic DI
DI
Sa
mple Clock
DI Ch
a
nge
Detection
I/O Protection
We
a
k P
u
ll-Down
P0.
x
S
t
a
tic DO
B
u
ffer
DI W
a
veform
Me
asu
rement
FIFO
Filter
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