Basler Electric DGC-2020ES - Manual (Page 201)

9469200990 Rev C 193
Notes
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 92. CAN Interface with CEM-2020 providing One End of the Bus
Figure 93. CAN Interface with DGC-2020ES providing One End of the Bus
DGC-2020ES
CEM-2020
(Optional)
P0067-96
Engine
120 ohm
Termination
CAN-H
CAN-L
Other
Devices
120 ohm
Termination
Bus
Stub
DGC-2020ES
Other
Devices
P0067-85
Engine
120 ohm
Termination
CAN-H
CAN-L
CEM-2020
(Optional)
120 ohm
Termination
Bus
Stub
DGC-2020ES CEM-2020