Basler Electric DECS-250N - Manual (Page 361)

9440500990 Rev D 345
DECS-250N Contact Expansion Module
Note
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 191. CAN Bus Interface with CEM-2020 providing One End of the Bus
Figure 192. CAN Bus Interface with DECS-250 providing One End of the Bus