© National Instruments Corp. 7 NI 9411 Operating Instructions and Specifications
Each channel has two pins, DIa and DIb, to which you can
connect digital input signals. The DSUB connector also provides
two connections for supplying 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 supply.
If you do not have a 5 V power supply to directly power the
external device or if you want to simplify wiring, you can connect
an external power supply to the V
sup
and COM terminals on the
NI 9411 screw-terminal connector, and connect the external device
to one of the 5V
out
pins. If the external device is already powered,
you do not need to connect a power supply to the NI 9411 or
connect the +5 V
out
pin to the external device. Refer to the
Specifications section for information about the external power
supply specifications.
Note You must use 2-wire ferrules to create a secure
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
You 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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