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.
Figure 1.
CAN Bus Topology and Termination Resistor Locations
RTL CAN_L
RTH CAN_H
RTL CAN_L
RTH CAN_H
RTL CAN_L
RTH CAN_H
CAN_H
CAN_L
Low-speed/Fault-Tolerant
CAN Device
Low-speed/Fault-Tolerant
CAN Device
Low-speed/Fault-Tolerant
CAN Device
Connecting a CAN Bus to the NI 9852
You can connect each port of the NI 9852 to any location on a
CAN bus. Figure 2 shows one example of connecting CAN0 of
NI 9852 Getting Started Guide
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© National Instruments
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