NI 9852 Operating Instructions
8
ni.com
CAN Bus Topology and Termination
A CAN bus consists of two or more CAN nodes cabled together.
The CAN_H and CAN_L pins of each node are connected to the
main CAN bus cable through a short connection known as a “stub.”
The pair of signal wires, CAN_H and CAN_L constitutes a
transmission line. Every device on a low-speed/fault-tolerant CAN
network requires a termination resistor for each CAN data line:
R
RTH
for CAN_H and R
RTL
for CAN_L.
Figure 1 shows a simplified diagram of a low-speed/fault-tolerant
CAN bus with termination resistor placements.
