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2.3 CAN Network Wire Connection
In order to minimize the reflection effects on the CAN bus line, the CAN
bus line has to be terminated at both ends by two terminal resistances as
following figure. According to the ISO 11898-2 spec, each terminal resistance
is 120Ω (or between 108Ω~132Ω). The length related resistance should have
70 mΩ/m. The user should check the resistances of CAN bus, before install a
new CAN network.
Moreover, in order to minimize the voltage drop on long distance, the
terminal resistance should be higher than the value defined in the ISO 11898-2.
The following table could be a reference.
Bus Length
(meter)
0~40
40~300
300~600
600~1K
I-7188XBD-CAN/μPAC-7186EXD-CAN user manual (ver.1.0.3, May/09/2014)
Bus Cable Parameters
Length Related
Resistance
(mΩ/m)
70
0.34mm
< 60
< 40
< 20
Cross Section
(Type)
0.25(23AWG)~
2
(22AWG)
0.34(22AWG)~
2
0.6mm
(20AWG)
2
0.5~0.6mm
(20AWG)
2
0.75~0.mm
(18AWG)
Terminal
Resistance
(Ω)
124 (0.1%)
127 (0.1%)
150~300
150~300
11
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