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National Instruments RS485 User Manual

Page 9

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© National Instruments Corp.

9

NI 9871 Operating Instructions

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

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