reference ground for CAN_H and CAN_L. You can connect the
CAN bus reference ground (sometimes referred to as CAN_V-) to
one or both COM pins. The port also has an optional shield pin,
SHLD, that you can connect 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
Tables 1 and 2.
Table 4 lists recommended termination resistor values.
6
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NI 9853 Getting Started Guide
