6
4.
TYPICAL J1939 WIRING TOPOLOGY
Most modern engine installations include a harness with built-in J1939
backbone, (check engine manufacturer’s documentation). If not, it is critical
to use twisted shielded pair with a drain wire (max length 40m) terminated
with 120 ohm resistors at each end. In addition, all stubs should not exceed
1m in length, and a maximum of 30 nodes.
Stub (Max length 1m)
Node
(30 max)
Termination
Resistor (120 ohm)
Backbone
(Max length 40m)
Veethree M2
Display
Engine and/or
Transmission
Termination
Resistor (120 ohm)
