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Thank you for contacting Teltonika Networks Crowd support community.
Teltonika Networks has several devices that support the Modbus protocol and our devices have a user friendly WebUI for configuration.
We have devices that support Modbus on RS232, RS485 and Modbus TCP/IP.
If you are looking a device that supports rs485 we have TRB145 please check this link for more details https://teltonika-networks.com/product/trb145/
We have TRB245 which has both RS233 and RS485 please check here https://teltonika-networks.com/product/trb245/
We also have RUT955 with RS232, RS485 and 3XLAN and 1Xwan Ports check the following for more features https://teltonika-networks.com/product/rut955/
Here is an explanation on how Modbus is implemented on RUT955 https://wiki.teltonika-networks.com/view/RUT955_Modbus
Please check the links shared if you will need any clarification, please feel free to let me know.