National Instruments NI 9853

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 VSUP 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 Table1

and Table2.

Table4 lists recommended termination resistor values.