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National Instruments Corp.
7
NI 9411 Operating Instructions and Specifications
Each channel has two pins, DIa and DIb, to which yo
u
can
connect digital inp
u
t signals. The DSUB connector also provides
two connections for s
u
pplying power to an external device and
a connection for common. The NI 9411 also has a 2-terminal
screw-terminal connector that provides connections for an external
power s
u
pply.
If yo
u
do not have a 5 V power s
u
pply to directly power the
external device or if yo
u
want to simplify wiring, yo
u
can connect
an external power s
u
pply to the V
s
u
p
and COM terminals on the
NI 9411 screw-terminal connector, and connect the external device
to one of the
5 V
o
u
t
pins. If the external device is already powered,
yo
u
do not need to connect a power s
u
pply to the NI 9411 or
connect the +5 V
o
u
t
pin to the external device. Refer to the
Specifications
section for information abo
u
t the external power
s
u
pply specifications.
Note
Yo
u
m
u
st
u
se 2-wire ferr
u
les to create a sec
u
re
connection when connecting more than one wire to a
single terminal on the NI 9411 screw-terminal connector.
Connecting Differential Devices to the NI 9411
Yo
u
can connect differential devices to the NI 9411. Connect the
device to the DIa and DIb pins on the NI 9411. The NI 9411
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