National Instruments NI PCIe-8255R

Refer to Table1 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 Ciso on the 37-pin terminal block

•V

iso and Ciso on the 44-pin D-SUB

•V

iso and Ciso on the NI Vision I/O Terminal Block and

Prototyping Accessory

Refer to Table1 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 Figures4 and 5.

Figure 4. Installing a Ferrite Connector on the Power Supply Cable

Table 1. Isolated Power Supply Connection Options

Connection Method Viso Ciso

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

Viso terminal Ciso terminal

1 Power Supply Output Cable 2Ferrite