9440300990 33-9
DECS-250 Contact Expansion Module
1. If the CEM-2020 is providing one end of the J1939 bus, a 120 Ω,
½ watt terminating resistor should be installed across terminals
P1- LO (CANL) and P1- HI (CANH).
2. If the CEM-2020 is not part of the J1939 bus, the stub connecting
the CEM-2020 to the bus should not exceed 914 mm (3 ft) in
length.
3. The maximum bus length, not including stubs, is 40 m (131 ft).
4. The J1939 drain (shield) should be grounded at one point only. If
grounded elsewhere, do not connect the drain to the CEM-2020.
Figure 33-5. CAN Bus Interface with CEM-2020 providing One End of the Bus
Figure 33-6. CAN Bus Interface with DECS-250 providing One End of the Bus
AEM-2020
(Optional)
CEM-2020
Other
Devices
P0064-06
Genset
120 ohm
Termination
CAN-H
CAN-L
DECS-250
120 ohm
Termination
Bus
Stub
AEM-2020
(Optional)
DECS-250
Other
Devices
P0064-07
Genset
120 ohm
Termination
CAN-H
CAN-L
CEM-2020
120 ohm
Termination
Bus
Stub
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