Add a Modbus connection by clicking the Add button in the Configure Modbus Devices dialog
In CBXi controllers, each time you add a Modbus device you are offered the choice of adding
1. a Modbus RTU device connected to the CBXi’s RTU port
2. a Modbus IP device
3. a Modbus RTU device connected to a separate IP Router
Connecting directly to a Modbus RTU device
Select RTU Port and click OK ,