(IF REQUIRED) CONFIGURE A MODBUS CONNECTION
Modbus connections can be made directly to Modbus IP devices on an RTU trunk connected to the FBXi, or
over IP to RTU devices attached to a separate router.
Note: An FBXi cannot have both BACnet MS/TP trunk and a Modbus RTU trunk simultaneously, but an FBXi
controller that has an MS/TP subnet can read and write points to Modbus devices over IP.
Configuring a Modbus RTU connection
If a Modbus connection is to be through either of the RS485 Ports,
In the controller’s Web UI > RS 485 Port > Configuration page, set Protocol of the required port to Controller Modbus:
In CXproᴴᴰ, open the Strategy drawing for the FBXi.
With the Strategy open, right-click on the FBXi in the Site Tree, and select Configure Modbus Devices to open the
Modbus Configuration dialog:
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