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-   -   How to build an APC U.P.S. data cable. (http://www.hardwarecanucks.com/forum/guides-how-tos/17082-how-build-apc-u-p-s-data-cable.html)

BrainEater April 20, 2009 06:03 PM

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

Let me start this out with a comment about this cable.

For shame APC !

Doing the apple thing.....Proprietary cables to cash in....sheeesh.

35$ for this cable is theft.


Nice try tho..........I defy you !!!

The cable in question is the rj50 to USB data cable to connect an APC Uninteruptable Power Supply to the host computer.

This is a 10p10c modular phone connector.....looks like an ethernet plug but it's 10 pins.......that connects to a USB jack.


Donor USB cable + connectors ;



The pinouts can be found here : APC USB cable schematic pinout and signals @ pinouts.ru


Finished cable ;



That cost me 2$.

Srry APC.


ipaine April 20, 2009 06:18 PM


Now I have a different solution in case I lose my cables that I got with them.

MpG April 20, 2009 06:28 PM

So this is just a general data cable that they decided to use a RJ50 head for? This really is turning into the new profit-booster for the technology sector. :blarg:

BrainEater April 20, 2009 07:04 PM


They usta do db-9 (serial) type jacks.......then they went to rj-45's for a few.......it was then they realized the mistake of using a std ethernet connector , and switched to the rj50's.....to cash in... :sad:

Rj50's are actually becoming hard to find too....I had to phone 3 places before I found em at Active electronics.


The cable totally works !

It found new hardware etc....

I'm just gonna check out some software now....


lemonlime April 21, 2009 07:00 AM


I thought about doing this as well when I lost mine, but wound up finding it in the end. Wish they stuck with standard USB cables, but as mentioned, its pretty obvious that they are trying to cash-in on these at $35 a pop.

Eagle Eye April 21, 2009 08:28 AM

Still cost them even less based on the volume they produce them at, they're profit margins on those cables have to be in the 90-95 percentile.

Realityshift April 21, 2009 08:35 AM

Nerf APC.

SkyChief April 22, 2009 03:03 PM

My APC connection is a DB-9 and I have the APC 'signal' cable. This used to connect to my old PC. Now that I have a ASUS P6T Dlx and just realize there is no more serial connection jack anymore!

Do you think any of those USB to serial cable/adapter with the APC signal cable will work?

BrainEater April 24, 2009 04:58 AM

I really don't know.it's certainly possible.

Obaid December 15, 2012 12:44 PM

Obaid King
Friends i have a BACK UP CS 500...... and i haven't its USB port so i am trying to make it myself,,,,i bring connector and a USB wire now can someone tell me that there in USB just 4 wires and the connector have 10 pins so in which pin,,which wire should be inserted....plz plz plz help dearzzzzz

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