PISO-CANFD series CAN FD card User Manual (version 1.0.0)
Page: 17
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2.3. Wiring Connections
In order to minimize any reflection effects on the CAN bus line, it must be terminated at
each end using a terminator resistor, as illustrated in the diagram below. The
specifications provided in ISO 11898-2 state that each terminator resistor must be 120
Ω (or between 108 Ω and132 Ω). The bus topology and the positions of these terminator
resistors are shown below.
To minimize any voltage drop over long distances, the terminal resistance should be
greater than the resistance value defined in the ISO 11898-2. The following table can be
used as a good reference.
Bus Length
(meter)
Bus Cable Parameters
Terminal
Resistance (Ω)
Length Related
Resistance (mΩ/m)
Cross Section (Type)
0~40
70
0.25(23AWG)~
0.34mm
2
(22AWG)
124 (0.1%)
40~300
<60
0.34(22AWG)~
0.6mm
2
(20AWG)
127 (0.1%)
300~600
<40
0.5~0.6mm
2
(20AWG)
150~300
600~1K
<20
0.75~0.8mm
2
(18AWG)
150~300