National Instruments NI 9852

Each port has two isolated common pins (COM) that are internally

connected to the isolated reference of the module and serve as the

reference ground for CAN_H and CAN_L. Connect the CAN bus

reference ground (sometimes referred to as CAN_V–) to the COM

pin. 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.

Both of the ports on the NI 9852 require an external power supply

of +8V to +36 V to operate. Supply power from the CAN bus to

the VSUP0 pin on CAN0, and the VSUP1 pin on CAN1.

Pinouts for CAN0 and CAN1 of the NI 9852 are listed in Table1

and Table2.