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3.2.7.1
Recommendations for CAN Wiring
a) Build CAN network using cables with 2-pairs of twisted wires (2 wires/pair) as follows: one
pair for CAN_H with CAN_L and the other pair for CAN_V+ with CAN_GND. The cable
impedance must be 105 ... 135 ohms (120 ohms typical) and a capacitance below
30pF/meter.
b) When total CAN bus length is below 5 meters, it is possible to use a standard phone straight-
through cable (with parallel wires)
c) When total CAN bus length is over 40 meters, it is mandatory to use shielded twisted cables.
Connect the cable shield to earth/shield.
d) Whenever possible, use daisy-chain links between the CAN nodes. Avoid using stubs. A stub
is a "T" connection, where a derivation is taken from the main bus. When stubs can't be
© Technosoft 2011
Figure 3.30. J10 – CAN Connector
51
IDMx40
IDMx40 Technical Reference
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