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LPT: When plugging a USB cable into a C-More Micro, make sure you use the USB port!

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  • LPT: When plugging a USB cable into a C-More Micro, make sure you use the USB port!

    Learn from my mistake. Don't just feel around for the port. A USB-B plug fits perfectly in the RJ-12 socket. It also creates a dead short across all 6 pins of the RJ-12. This kills the internal 5V supply

    Click image for larger version

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    The panel will still function if powered via USB, but not using the 24V input


  • #2
    I can attest that it is a very good fit indeed. It took me awhile to figure out why I couldn't connect to a drive once. Fortunately for me, nothing was damaged.

    Does this mean you now have a test HMI?

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    • #3
      Originally posted by Mike Nash View Post
      Does this mean you now have a test HMI?
      Haha, exactly. I put an NG sticker over the 24v connector as a reminder. I also covered up the RJ-12 port on the replacement, and will do the same on future C-Mores to prevent this accident.

      Click image for larger version

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      • #4
        Found that it was just a blown fuse. It's a 2.5A surface-mount fuse, so I soldered in a separate 2A 5x20mm fuse. Still can't put it in a customer's machine, but now my 'test HMI' is fully functional

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        • #5
          Kind of related... The USB A side of the cable fits perfectly into the Ethernet port on your PC or laptop. That really makes you scratch your head...

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          • #6
            Originally posted by ljbeng View Post
            The USB A side of the cable fits perfectly into the Ethernet port on your PC or laptop
            Mine are right next to each other, so I plug USB cables into the Ethernet port pretty much daily

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            Thankfully, it does no damage.

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