Caution
The system shall be mounted in an ATEX/IECEx-certified
enclosure with a minimum ingress protection rating of at least IP54 as
defined in IEC/EN 60079-15.
Caution
The enclosure must have a door or cover accessible only by the
use of a tool.
Wiring the NI 9852
The NI 9852 has two 9-pin male D-Sub connectors that provides connections to a
CAN bus. Each port on the NI 9852 has pins for CAN_H and CAN_L, to which you
connect the CAN bus signals. Connect these signals using twisted-pair cable.
Each port has two isolated common pins (COM) that are internally connected to the
module’s isolated reference and serve as the 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.
Both of the ports on the NI 9852 require an external power supply of +8 to +25 V to
operate. Supply power from the CAN bus to the V
SUP0
pin on CAN0, and the V
SUP1
pin on CAN1.
Pinouts for CAN0 and CAN1 of the NI 9852 are listed in Tables 1 and 2.
Connector
Pin
Signal
1
No Connection (NC)
2
CAN_L
3
COM0
4
NC
5
SHLD
6
COM0
7
CAN_H
8
NC
9
V
SUP0
Table 1. Pin Assignments for CAN0
© National Instruments
5
NI-9852 Getting Started
