The only drawback was needing a ~$25 APC smart signaling cable in order to utilize pfSense's Apcupsd server package via Modbus for workstation shutdown signaling over the network but this APC-proprietary cable was not included (the UPS's lone USB port was already occupied by a Synology server).

The only drawback was needing a ~$25 APC smart signaling cable in order to utilize pfSense's Apcupsd server package via Modbus for workstation shutdown signaling over the network but this APC-proprietary cable was not included (the UPS's lone USB port was already occupied by a Synology server).

Here is a link to that fine stranded cable: TEMCo WC0201-30' (15' Blk, 15' Red