Activity Forums Questions & Troubleshooting Hardware How to totally reset a C. Mega?

  • How to totally reset a C. Mega?

     miko-edv updated 4 years, 2 months ago 2 Members · 3 Posts
  • miko-edv

    January 11, 2020 at 3:50 pm


    we bought 3 Controllino Mega about mid November.

    Now, as the project is working in the test environment and the machine #1 gets shipped, the preparations for #2 are on.

    You can imagine my astonishement, when the 3rd Controllino not only gets a different COM-port on the same PC (the other 2 get Com6, this wants to be called as Com8), but also refuses to get _any_ sketches uploaded – not even blink.ino can be transferred …

    The serial monitor (shift-ctrl-m) can attach, but gets no output – no wonder as the Controllino is still virginal.

    My thought is that it is somewhere with a damaged loader module, so I want to reload ist.

    How can this be done?



  • Lukas

    March 9, 2020 at 12:22 pm


    to be honest I am more surprised that the first two MEGAs use the same COM port number.

    Because typically each new device is assigned with a new COM port number. To be precise – this may be configured in the operating system settings – if a new device with the same PID/VID gets the same or a new COM port number.

    I have published some tutorial how to upload a bootloader to MINI. It is not prepared for MAXI and MEGA yet …

    Please check how it is recognized by the operating system (Device Manager in Windows). As Arduino Mega?



  • miko-edv

    March 9, 2020 at 5:15 pm


    I must admit, I totally forgot this topic – I have sent the Controllino back and received another one, which is working correctly.

    But you’re right – the double usage of the same COM port is a bit strange; from another PC with meanwhile dozens of USB-serial-devices I’m used to growing COM port numbers, the counter there has nearly reached the 50 …

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