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  1. stellarmoig

    How to build an APC U.P.S. data cable.

    Nice! Glad to help.
  2. stellarmoig

    How to build an APC U.P.S. data cable.

    Looks like it's flipped. My picture that looked similar was also from the bottom, but the wiring diagram from the top. Just solder with everything 180deg and it should work.
  3. stellarmoig

    How to build an APC U.P.S. data cable.

    You probably have the pins flipped around. Orientation is important. Loads of soldering tutorials online if you're having a hard time. If you take a picture of what you've done I can take a look.
  4. stellarmoig

    How to build an APC U.P.S. data cable.

    Preformed on 3 different RJ50 equipped APC units since I lost the USB cables in a multitude of ownership transfers and moving houses over the past 10+ years: ES550, ES750, and BR1000G. All you need is a USB-B connector. Steps here: After removing the battery, and letting the unit sit overnight...
  5. stellarmoig

    How to build an APC U.P.S. data cable.

    As an engineering student with a desire to do something physical while school labs are closed on during COVID-19, I submit here my pinouts used on my USB-B modification. These are looking "down" onto the RJ50 connector with the USB in the same orientation.

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