National Instruments NI-DNET - page 64

Appendix B Cabling Requirements
NI-DNET User Manual B-4 ni.com
The PCI-CAN is shipped with this jumper set in the EXT position. In this
position, the physical layer is powered from the bus (the V+ and V– pins
on the Combicon connector). The jumper must be in this position for the
DeviceNet interface to be compliant with the DeviceNet Specification.
If the DeviceNet interface is being used in a system where bus power is not
available, the jumper may be set in the INT position. In this position, the
physical layer is powered by the host computer or internally. The physical
layer is still optically isolated. Figure B-5 shows how to configure your
jumpers for internal or external power supplies.
Figure B-5. Power Source Jumpers
For port one of the PXI-8461, power is configured with jumper J5. The
location of these jumper is shown in FigureB-6.
INT EXT
a. Internal Power Mode
INT EXT
b. External Power Mode
(DeviceNet)
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