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I tried for hours to get it to accept a TCP connection following the examples in the manual USR-W630-User-Manual-V1.0.3.pdf. The manual in part shows screenshots with Chinese characters but one can still figure out what is meant from context. The reason I bought this product is to use it as a converter between Modbus RTU and Modbus TCP. I could not even get it to work as a straight-forward Ethernet to serial converter. There are no examples or videos to be found on the internet from other users - so adoption of this product is not wide spread. I contacted the seller with my questions but have not received a response.