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Figure 4.1 CMS Control-board connectors
4.2 Connecting the SRC and CMS Control Boards with the Modbus Gateway
To communicate with a Liebert® SRC Mini-Split Cooling System, you must install a Modbus gateway that
connects the control board in the SRC evaporator/indoor unit and the iCOM CMS control board. Once
connected, the CMS control board can support up to 8 additional SRC units, by connecting gateways to
the units, and daisy-chaining the gateways together.
The Modbus gateway ships in its own box with the CMS kit. The Modbus gateway box includes the
following:
•
Modbus gateway
•
Black cable—to provide power and communication between the SRC board and the gateway.
•
"Installation Manual V-Net"—instruction sheet to describe the connection between the SRC
board and the gateway.
36
ITEM
DESCRIPTION
1
Ethernet port
2
USB ports
3
485 port for unit communication
4
24-VAC power input
5
485 port for BMS serial communication
Vertiv™ | Liebert® iCOM CMS™ Intaller/User Guide
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