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Figure 2 shows the method of power connection to the NI 9871 
module. Attach an isolated power supply to the V

sup

 and COM 

terminals using the included pigtail.

Figure 2.  Powering the NI 9871 from an Isolated Power Source

Figure 3 shows how to use the optional y-adapter (available at 

ni.com/serial

) to connect power to more than one module 

using the same power source. One y-adapter is needed for each 

Red (+)

Black (–)

NI P/N 198159-XX:

Female Microfit

Pigtail

V+
V–

Any 8 - 28 V     

Isolated

Power Supply