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Appendix B Cabling Requirements for PXI-8461 High-Speed CAN
PXI-8461 or PXI-8460 and NI-CAN for Windows NT B-4 www.natinst.com
Figure B-4 shows how to configure your jumpers for internal or external
power supplies.
Figure B-4. Power Source Jumpers
The CAN physical layer is still isolated regardless of the power source
chosen.
Bus Power Supply Requirements
If the CAN physical layer is powered from a bus power supply, the power
supply should be a DC power supply with an output of 10 V to 30 V. The
power requirements for the CAN ports for bus-powered configurations are
shown in Table B-1. You should take these requirements into account when
determining requirements of the bus power supply for the system.
Table B-1. Power Requirements for the CAN Physical Layer for
Bus-Powered Versions
Characteristic Specification
Voltage requirement V+ 10 to 30 VDC
Current requirement 40 mA typical
100 mA maximum
INT EXT
a. Internal Power Mode
INT EXT
b. External Power Mode
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