MultiSmart Installation & Operation Manual
7.5.4 CAN Bus I/O Expansion
MultiSmart I/O expansion units are connected to the main MultiSmart unit using the CAN Bus network. The
CAN Bus cannot be used for other external devices.
Third party external I/O modules are connected through the Ethernet port, RS232 ports, or RS485 ports (See
Section 14.7). With custom engineering, any I/O module that supports DNP3 or Modbus communications can
be interfaced to the MultiSmart.
The CAN Bus baud rate and the device ID are set using the dial switches shown below. The ID must be
unique and non-zero for each device on the CAN Bus.
The baud rate should be set to the same speed on every device connected to the bus. Select a suitable
speed for the length of cable between devices as shown in the table below.
Figure 52 – CAN Bus Settings
Table 3 – Max. Cable Length at Specific Baud
Rates
If the CAN Bus baud rate is changed on the unit, the same change must be made in the Advanced menu.
Navigate to:
Then select the appropriate value.
Page 52 of 260 MultiSmart_IO_Manual_R20
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