National Instruments NI 9475 - Manual (Page 8)

NI 9475 Operating Instructions and Specifications 8 ni.com
You can directly connect the NI 9475 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect to the NI 9475 are compatible
with the output specifications of the module. Refer to the
Specifications section for more information about the output
specifications.
Connect the device to DO and connect the common of the device
to COM. Refer to Figure 2 for an illustration of how to connect a
device to the NI 9475.
Figure 2. Connecting a Device to the NI 9475
External
Power
Supply
Device
COM
DO
V
sup
NI 9475
+
–