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P a g e
4.5 Connection
The CAN wires are designated by a yellow and a green wire, connected to pins 7 and 14 on the Main Harness.
If they are not already twisted, they should be twisted together.
Colour coding of the wires are shown in the tables below:
Table 1:
FM300 Main Harness CAN colour coding
Wire Colour
Function
Green
CAN-Low
Yellow
CAN-Hi
Table 2:
FM 3316 J1708 harness wire colour coding
Wire Colour
Function
Yellow
J1708 B
Blue
J1708 A
4.5.1 Wire lengths
The CAN wires between the FM 3617i/FM 3717i/FM
3817i and the vehicle’s bus should be no longer than 300
mm. Excessive wire length may cause interference with the vehicle’s normal operation.
4.5.2 CAN jumper settings
Warning
:
It is very important to ensure that these jumper settings are correct at installation time. If these
jumpers are set incorrectly it is possible that when a new configuration or script is downloaded to the FM
3617i/FM 3717i/FM 3817i, it could bring down the CAN bus of the vehicle and interfere with the operation of
the vehicle. Conduct ESD precautions as described in section 3.1.4
Refer to
Description
Error!
eference
source
not
found.
FM 36xxi / FM 37xxi/FM 3817i Circuit board showing jumper positions for “listen only” CAN
mode without 120
Ω termination
Figure 2
FM 36xxi / FM 37xxi/FM 3817i Circuit board showing jumper positions for “listen only” CAN
mode with 120
Ω termination
Figure 3
FM 36xxi / FM 37xxi/FM 3817i Circuit board showing jumper positions for “read/write” CAN
mode with 120
Ω termination
Figure 4
FM 36xxi / FM 37xxi/FM 3817i Circuit board showing jumper positions for “read/write” CAN
mode without 120
Ω termination
