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Guangcheng Technology
GCAN-PLC user manual
Baud rate
Distance
1 Mbit/s
40m
500 kbit/s
110m
250 kbit/s
240m
125 kbit/s
500m
50 kbit/s
1.3km
20 kbit/s
3.3km
10 kbit/s
6.6km
5 kbit/s
13km
Table 3.1
the relationship between CAN-Bus length and baud rate.
3.3. CAN-Bus terminal resistance
In order to enhance the reliability of CAN communication and eliminate
the interference of CAN bus terminal signal reflection, the two farthest
endpoints of the CAN bus network usually need to add terminal matching
resistors, as shown in
Figure 3.2
. The value of the terminal matching resistance
is determined by the characteristic impedance of the transmission cable. For
example, the characteristic impedance of the twisted pair is 120Ω, and the two
end points on the bus should also be integrated with 120Ω terminal resistance.
If other nodes on the network use different transceivers, the terminal resistance
must be calculated separately.
Figure 3.2
GCAN-PLC-510 connect with other nodes
Please note:
GCAN-PLC-510 hasn't integrated 120Ω terminal resistance. If the
number of nodes is more than 2, the middle node does not need to install 120Ω
terminal resistance. When you need to use it, connect the both sides of the
resistance to CAN_H and CAN_L
