NI 9870 Operating Instructions
8
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You must connect an external power supply to the NI 9870. This
power supply provides the power for the RS232 transceivers on the
module. You can use the included female four-position pigtail to
connect to an external voltage source. Figure 1 lists the
connections between an external voltage source (of +8 V to +28 V)
and the NI 9870.
Figure 1.
Four-Position External Power Connector
1
V
S
UP
2
V
S
UP
3
COM
4
COM
1
3
4
2
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