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  • Computer don’t recognize the controllino

  • lanix1

    June 13, 2022 at 9:15 pm


    I have problem with my controllino MAXI 100-101-10

    the computer don’t recognize the controllino, I connect the usb cable and see in the device manager the contollino and show this device as a warning “ATmega16u2 DFU” and I cant download my program to my controllino. the controllino is new. I will apreciate any help. thank you.

  • marlynrosado

    June 29, 2022 at 8:39 am

    My controllino MAXI 100-101-10 has problems, too. Did you get an answer to this question?

  • Valentin

    October 3, 2022 at 12:32 pm

    We have the exact same problem. Help would be appreciated.

  • Valentin

    October 4, 2022 at 11:29 am

    More information:

    Previous batches of Controllino Maxi Automation PURE 100-101-10 had no issues.

    Once the functioning versions were connected by USB under Linux it showed:


    usb 2-2: Manufacturer: Arduino (
    usb 2-2: SerialNumber: 85035303038351419261
    cdc_acm 2-2:1.0: ttyACM0: USB ACM device


    Bus 002 Device 013: ID 2341:0042 Arduino SA Mega 2560 R3 (CDC ACM)

    However, with the newest batch with the exact same version number (Maxi Automation PURE 100-101-10) we get the following:


    usb 2-2: New USB device found, idVendor=03eb, idProduct=2fef, bcdDevice= 0.00
    usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
    usb 2-2: Product: ATmega16u2 DFU
    usb 2-2: Manufacturer: ATMEL


    Bus 002 Device 014: ID 03eb:2fef Atmel Corp. atmega16u2 DFU bootloader

    We cannot upload sketches in the IDE and there the port is not offered.

    Windows has similar issues and atmega16u2 shows in device manager but cannot install driver.

  • pedro-controllino

    October 4, 2022 at 12:01 pm

    Hello community,

    If the problem is the USB chip in DFU mode please follow this tutorial:

    This is the path to the folder with the .hex files should be:


    for MINI use: UNO-dfu_and_usbserial_combined.hex

    for MAXI or MEGA use: MEGA-dfu_and_usbserial_combined.hex

    Hope this fix the issue you have with your boards,

    Best Regards,


    • Valentin

      October 4, 2022 at 12:09 pm

      Hi Pedro,

      thank you very much for this quick response. We found this article yesterday too.

      However, we did not find a way to put the Controllinos in DFU mode.

      <div>We need to short some pins on Arduinos, but where do we find them on Controllinos.

      I am also surprised that such things is necessary for the “industry ready” arduinos, in particular, once they are already installed in cabinets.


      Best regards,


  • Valentin

    November 29, 2022 at 3:17 pm

    We sent the PLCs back to Controllino GmbH and it was confirmed that they are faulty.

    After 6 weeks they came back repaired and tested.

    Whoever has this issues should contact them for possible replacement.

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