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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

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