WIZ107SR-TTL no response

I have recently purchased 2 WZI107SR-TTL boards. I have powered them with 3,3V (power LED is on), but after connecting to switch or hub there is nothing happening on socket activity LEDs. I checked with different cables and switches. Is there anything special I need to do to start using the board?


There is nothing special - just connect 3,3V and the Link-LED should show the connection status.
Is your 3,3V power source stable? Use a DSO to confirm, some regulator-boards can be really bad.
What’s the current consumption of the module?
What is connected to the other pins?

Thank you, was a power supply issue indeed.