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.
Caution
You must use a UL listed ITE power supply
marked LPS with the NI 9881.
The NI 9881 requires an external power supply of +9 to +30 V to
operate. Supply power to the NI 9881 V
SUP
pin.
Note
Power on V
SUP
is required for CANopen
operation.
The NI 9881 pinout is listed in Table 1.
The NI 9881 features software-selectable bus termination for
High-Speed CAN transceivers. On the NI 9881, you can enable
120 Ω termination resistors between CAN_H and CAN_L
through an API call. Table 3 lists recommended termination
resistor values.
6
|
ni.com
|
NI 9881 Getting Started Guide
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
