AppendixC CablingRequirements for PXI-8461 High-Speed CAN
PXI-846xand NI-CAN for Windows NT C-4 ni.com
Figure C-4 showshow to configure your jumpers for internal or external
powersupplies.
FigureC-4. PowerSource Jumpers
The CAN physical layer is still isolated regardless of the power source
chosen.
Bus Power Supply Requirements
Ift he CAN physical layer is poweredfrom a bus power supply, the power
supply should be a DC powersupply w ith an output of 10 V to 30 V.The
powerrequirements for the CAN ports for bus-powered configurations are
shownin Table C-1. Youshould take these requirements into account when
determining requirements of the bus powersupply for the system.
TableC-1. PowerRequirements for the CAN Physical Layer
forBus-Powered Versions
Characteristic Specification
Voltagerequirement V+10 –30 VDC
Currentrequirement 40 mA typical
100mA maximum
INT EXT
a.Internal Power Mode
INT EXT
b.External Power Mode
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