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I was skeptical at first but thought i would give it a try. I am using several of these for Modbus TCP to RTU RS-485 conversions talking to variable frequency drives in the oilfield. I love the activity LED's very helpful for troubleshooting. The things just work, having two active ports is a plus. I have multiple modbus masters talking to the drives and so far all is working great, some of my drive strings are 16 units deep. So as long as you follow the RS-485 rules, they just work.