Actia TGU-R ACCESS, User Manual

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P218703 ADt 001 M
B
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VII.5 CAN
LINES
General:
CAN wiring lines must withstand the following constraints:

We recommend to twist CANH, CANL lines to avoid EMC issues. The wire section must be at least 0,5
mm².

It is possible to twist a ground wire with CANH and CANL.
CAN lines layout:
The CAN lines must not be placed near disturbing cables such as:

Power cables (DC/DC converters)

Cables connected to loads driven in PWM mode
The CAN line must be as short as possible. The loops on the CAN line must be avoided.
Two 120
 resistors must be placed at each bus termination:
ECU ECU ECU ECU
120 Ohm
120 Ohm
The following topology can be also used, when it is not possible to use the previous one:
ECU ECU ECU
ECU
ECU
ECU
1
2
0
O
h
m
1
2
0
O
h
m
1 m
1 m
Note: each rectangle represents an ECU. Depending on ECU version, the 120

internal resistor can be always
present or selectable by external wiring: see each ECU data sheet.
If TGU-R ACCESS is acting as CAN termination node, CAN strap option could be done via CN1 wire harness, see
product specification for more details
REF1 .
Wiring layout:
ECU 1
ECU 2 ECU 3 ECU n
- 1
ECU n
L
d
w