National Instruments RS485 - Manual (Page 10)

NI 9871 Operating Instructions 10 ni.com
additional module. Ensure that the power supply can handle
maximum power requirements for all modules connected.
Caution All connections must be made before power is
applied.
Figure 3. Powering Multiple Modules from a Single Power Supply
Red (+)
Black (–)
NI P/N 198303-XX:
Male Microfit
Y-Adapter
NI P/N 198159-XX:
Female Microfit
Pigtail
V+
V–
Any 8 - 28 V
Isolated
Power Supply