3-14 9469300994
Typical Applications DGC-2020HD
CAN Connections
Typical CAN connections are shown in Figure 3-26 and Figure 3-27.
1. If the DGC-2020HD is providing one end of the J1939 bus, a 120
ohm, ½ watt terminating resistor should be installed across
terminals 51 (CAN1L) and 52 (CAN1H) or 54 (CAN2L) and 55
(CAN2H).
2. If the DGC-2020HD is not providing one end of the J1939 bus, the
stub connecting the DGC-2020HD 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 DGC-
2020HD.
5. It is recommended to upgrade the firmware in all AEM-2020s and
CEM 2020s that share a CAN bus network with a VRM-2020.
Upgrade CEM-2020s to firmware version 1.01.05 or later.
Upgrade AEM 2020s to firmware version 1.00.06 or later.
Figure 3-26. CAN Interface with DGC-2020HD Providing One End of the Bus
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