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

stellarmoig

Member
Joined
May 24, 2020
Messages
5
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.
 

KaptCrunch

Well-known member
Joined
Feb 23, 2008
Messages
4,382
Location
Ontario
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.

found same forgot to correct it.
guess orginale poster was circumventing pripority rights trademarks of diagram.

i noticed after first go that data ground was not correct
 

FrankM62

New member
Joined
May 3, 2022
Messages
1
Meanwhile, you can get replacement cables at a reasonable price on Amazon.

Check this on Amazon.

 

dacableguy

New member
Joined
Mar 17, 2022
Messages
1
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.

View attachment 28848
View attachment 28849

Actually the RJ50 is not THAT stupid, some APC UPS systems featue TWO interfaces using the same connector, so you can use a RJ50 to USB cable or alternatively an RJ45 to D-sub 9p serial cable also fitting into this connector! This is why my Back UPS RS 550s RJ50 connector is labelled "USB or serial"
 

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