Arduino Opta Modbus RTU issue

Official Hardware Opta
1

Hi everyone,

I am using an Arduino Opta WiFi with Modbus RTU (RS485).

Earlier, I connected the Opta with other Modbus devices (HMI, Energy meter) successfully. Now, I cannot get any Modbus communication with those devices. The same issue happens even when using a Modbus simulator, with the Opta configured as both master and slave, in Arduino IDE and PLC IDE(Updated).

  • Wiring unchanged
  • Requests are sent
  • No valid response (timeout / CRC error)

Is there any reset, configuration, or known issue that could cause this on the Opta?

Thank you!

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