8-8 DGC-2020 LSM-2020 (Load Share Module) 9400200990 Rev I
CAN Interface
These terminals provide communication using the SAE J1939 protocol and provide high-speed
communication between the LSM-2020 and the DGC-2020. Connections between the LSM-2020 and
DGC-2020 should be made with twisted-pair, shielded cable. CAN interface terminals are listed in
Table
8-4. Refer to Figure 8-4 and Figure 8-5.
Table 8
-4. CAN Interface Terminals
Terminal Description
P2-12 (CAN L) CAN low connection (green wire)
P2-11 (CAN H) CAN high connection (yellow wire)
P2-10 (SHIELD) CAN drain connection
DGC-2020
LSM-2020
Other
Devices
P0053-07
Engine
120 ohm
Termination
120 ohm
Termination
CAN-H
CAN-L
CEM-2020
(Optional)
Figure 8-4. CANBus Interface with LSM-2020 providing One End of the Backbone
NOTES
1.) If the LSM-2020 is providing one end of the J1939 backbone, a 120 Ω
terminating resistor should be installed across terminals P2-12 (CANL) and P2-
11 (CANH).
2.) If the LSM-2020 is not part of the J1939 backbone, the stub connecting the
LSM-2020 to the backbone should not exceed 914 mm (3 ft) in length.
3.) The J1939 drain (shield) should be grounded at one point only. If grounded
elsewhere, do not connect the drain to the LSM-2020. The closest connection to
the center of the network should be used.
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