National Instruments NI PCIe-8255R - Manual (Page 9)

© National Instruments Corporation 9 NI PCIe-8255R User Manual
Refer to Table 1 for a summary of the isolated power supply
connections.
.
2. Complete this step if you are using a power supply other than the NI
desktop power supply. If you are using the NI desktop power supply,
skip this step and proceed to step 3.
a. Wire the voltage output and the common-mode (ground) output of
the isolated power supply to one of the following options:
• V
iso
and C
iso
on the 37-pin terminal block
• V
iso
and C
iso
on the 44-pin D-SUB
• V
iso
and C
iso
on the NI Vision I/O Terminal Block and
Prototyping Accessory
Refer to Table 1 for a summary of the isolated power supply
connections.
3. (Optional) To suppress electromagnetic interference, install a ferrite on
the power supply cable as close to the connection to the NI 8255R as
possible. Wrap the power supply cable around the ferrite two times, as
shown in Figures 4 and 5.
Figure 4. Installing a Ferrite Connector on the Power Supply Cable
Table 1. Isolated Power Supply Connection Options
Connection Method V
iso
C
iso
Custom cable 10, 25 14, 26, 29, 33, 36, 39, 42
44-pin D-SUB to 37-pin terminal block 17, 33 12, 16, 18, 28, 32, 34
44-pin D-SUB to 37-pin NI Vision I/O
Terminal Block V
iso
terminal C
iso
terminal
1 Power Supply Output Cable 2 Ferrite
1
2