National Instruments NI PCIe-8255R Quick Start Manual page 8

Wiring Isolated Output Power to the NI 8255R
Do not connect the NI 8255R isolated power to a source less than 5 VDC or
Caution
greater than 30 VDC. Doing so could damage the NI 8255R device.
NI PCIe-8255R User Manual
Complete the following steps to connect power for the isolated outputs to
the NI 8255R.
1. Complete this step if you are using the NI desktop power supply
(part number 778794-01). If you are using a power supply other than
the NI desktop power supply skip this step and proceed to step 2.
a. Disconnect the 4-position power connector from the power
supply, as shown in Figure 3.
1
2
3
1 4-Position Power Connector
2 V Position
Figure 3. Removing the 4-Position Power Connector from the Power Supply
b. Depending on your connection method, reconnect the V
C wires to one of the following options:
iso
• V and C
iso
• V and C
iso
• V and C
iso
Prototyping Accessory
4
3 C Position
4 Power Supply Wire
on the 44-pin D-SUB
iso
on the DIN rail terminal block
iso
on the NI Vision I/O Terminal Block and
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8
and
iso
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