I searched and didn’t find anything like this here. Since I was figuring it out I thought I’d post this for anyone else wanting to do this.  I plan to use this to send pushbullet alerts if my system goes on battery, meaning the power has gone offline. All my networking gear is on this UPS so I’m hoping the message will make it out before everything goes offline. 🙂  I have an old APC Back-UPS XL 1000. It has a 10-pin RJ50 connector on the back. Perhaps you have the cable that came wi...