9469300994 3-15
DGC-2020HD Typical Applications
Figure 3-27. CAN Interface with Other Devices Providing One End of the Bus
Expansion Module Connections (CAN 1)
The AEM-2020 (Analog Expansion Module), CEM-2020 (Contact Expansion Module), and VRM-2020
(Voltage Regulation Expansion Module) are optional modules that may be connected with the DGC-
2020HD. These modules interface to the DGC-2020HD via the “CAN 1” interface, thus the CAN terminals
(51, 52, and 53) are the only common connections between the DGC-2020HD, AEM-2020, CEM-2020,
and VRM-2020. A CAN interface configured for 250 kbps supports the following combinations of AEM-
2020, CEM-2020 and VRM-2020 modules:
• Up to six CEM-2020s, two AEM-2020s, and one VRM-2020
• Up to five CEM-2020s, three AEM-2020s, and one VRM-2020
• Up to four CEM-2020s, four AEM-2020s, and one VRM-2020
On a CAN configured for 125 kbps, only up to two AEM-2020 modules are supported if a VRM-2020 is
used. Typical connections are illustrated in Figure 3-28.
Refer to the AEM-2020, CEM-2020, and VRM-2020 chapters in the Accessories manual for more
information.
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