The following figure shows a simplified diagram of a CAN bus with multiple CAN
nodes and proper termination resistor (R
t
) locations.
Figure 2. CAN Bus Topology and Termination Resistor Locations
CAN
Node
CAN
Node
CAN
Node
Rt
Rt
CAN
Node
CAN_H
CAN_L
CAN_H
CAN_L
CAN_H
CAN_L
CAN_H
CAN_L
Bus Cable Length
Stub
Length
Connecting a CAN Bus to the NI-9862
You can connect the NI-9862 port to any location on a CAN bus. The following figure
shows one example of connecting the NI-9862 directly to one CAN node.
Figure 3. Connecting the NI-9862 to a CAN Device
C Series
Module
CAN Device
R
t
CAN
Cable
(With
Optional
Shield)
(SHLD)
CAN_H
CAN_L
V
sup
COM
R
t
(SHLD)
CAN_H
CAN_L
V
sup
COM
NI-9862 Hardware Overview
The NI-9862 has one full-featured CAN port that is isolated from the other
modules in the system. The port has a Bosch DCAN CAN controller that is CAN
2.0B-compatible and fully supports both 11-bit and 29-bit identifiers. The port also
has an NXP TJA1041AT High-Speed CAN transceiver that is fully compatible with the
ISO 11898 standard and supports baud rates up to 1 Mbps.
© National Instruments
7
NI-9862 Getting Started
