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You can use the SmartServer to integrate and manage Modbus devices.  If you are using Modbus TCP devices, you can interface with them using the SmartServer's built-in Modbus driver and the built-in LAN and WAN Ethernet interfaces.  If you are using Modbus RTU devices, you can interface with the using the SmartServer's built-in Modbus driver and the built-in isolated RS-485 interface.  The RS-485 interface is only available on the SmartServer IoT EX model.  If you do not have an EX model, you can also add an IOX I/O Expansion Module for a Modbus RTU compatible isolated RS-485 interface. 

Modbus RTU support for SmartServer Pi requires a USB to RS-485 bidirectional converter (e.g., https://www.waveshare.com/usb-to-rs485.htm).

With SmartServer 4.2 and higher, the Modbus driver is enabled by default for SmartServer IoT and disabled by default for SmartServer Pi. When this the Modbus option is set to enabled, Modbus TCP and RTU are enabled; however, Modbus RTU also require requires that the RS-484 interface is configured. When this the Modbus option is set to disabled, Modbus TCP and RTU are disabled.

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