National Instruments NI 9853 - Manual (Page 5)

© National Instruments Corp. 5 NI 9853 Operating Instructions
one or both of the COM pins. Each port also has an optional shield
pin, SHLD, that can be connected to a shielded CAN cable.
Connecting SHLD may improve signal integrity and EMC
performance in a noisy environment.
CAN0 of the NI 9853 is internally powered, and therefore requires
no external power supply. CAN1 requires an external power supply
of +8 to +25 V to operate. Supply power to the V
SUP
pin of CAN1
from the CAN bus.
Note Although CAN0 of the NI 9853 does not require an
external power supply to operate, it can be connected to a
powered CAN bus without being damaged.
Pinouts for CAN0 and CAN1 of the NI 9853 are listed in Table 1
and Table 2.
Table 4 lists recommended termination resistor values.