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3 Installation
3.5 Communication port
3.5.2 CAN port
Node 1
CAN Bus Line
Node n
GND
CAN_H
CAN_L
CAN is a bus system, to which all nodes are connected in parallel. A terminal resistance of 120
must
be connected to each end of the bus line.
In addition to the two signal lines CAN_H and CAN_L, the nodes must also be connected to each
other by a common GND line.
The maximum line length is limited by the transfer rate and the signal propagation times:
Baud rate
Max. line length (incl. stub)
1 000 kBit/s
25 m
500 kBit/s
100 m
250 kBit/s
250 m
125 kBit/s
500 m
50 kBit/s
1,000 m
20 kBit/s
2,500 m
10 kBit/s
5,000 m