Basler Electric DECS-250N - Manual (Page 182)

166 9440500990 Rev D
Communication DECS-250N
CAN Communication
BESTCOMSPlus Navigation Path: Settings Explorer, Communications, CAN Bus, CAN Bus Setup
HMI Navigation Path: Settings, Communications, CAN Bus, CAN Bus Setup
One CAN (controller area network) interface (CAN 1) facilitates communication between the DECS-250N
and optional modules such as the contact expansion module (CEM-2020) and analog expansion module
(AEM-2020).
A second CAN interface (CAN 2) enables the DECS-250N to provide generator and system parameters
to a generator controller such as the Basler DGC-2020. CAN 2 also permits DECS-250N setpoint and
mode control from an external device connected to the CAN.
Both CAN bus interfaces utilize the SAE J1939 messaging protocol.
DECS-250N CAN parameters are listed and defined in the CAN Communication chapter of this manual.
Connections
DECS-250N CAN connections should be made with twisted-pair, shielded cable. Each CAN port
(designated CAN 1 and CAN 2) has a CAN high (H) terminal, a CAN low (L) terminal, and a CAN drain
(SH) terminal. CAN port terminals are illustrated in the Terminals and Connectors chapter of this manual.
Port Configuration
Each DECS-250N CAN port must be identified by a unique address number A . The baud rate B of each port
can be configured for 125 kbps or 250 kbps. Port configuration settings are illustrated in Figure 141.
Figure 141. CAN Port Configuration Settings
A CAN bus Address: Adjustable from 1 to 253.
B Baud Rate: Select 125 kbps or 250 kbps.
Remote Module Setup
BESTCOMSPlus Navigation Path: Settings Explorer, Communications, CAN Bus, Remote Module
Setup
HMI Navigation Path: Settings, Communications, CAN Bus, Remote Module Setup
Optional, external modules, such as the contact expansion module (CEM-2020) and analog expansion
module (AEM-2020), communicate via the DECS-250N CAN 1 interface and are configured through the
DECS-250N BESTCOMSPlus interface. These settings are illustrated in Figure 142.
Contact Expansion Module
When enabled A for operation, the CEM-2020 CAN address B is assigned a unique number and the number
of outputs C is selected. Standard module (CEM-2020) provides 24 output contacts and high-current
module (CEM-2020H) provides 18 output contacts.
Analog Expansion Module
When enabled D for operation, the AEM-2020 CAN address E is assigned a unique address for
communication on the network.