New high quality UPS serial interface cables that provide direct communication between APC UPSs and desktops, workstations, and servers.
Cable is 6ft long.
Same as APC part number AP9827 or APC 940-0127B and C and many others.
If your APC ups (Back-UPS ES, CS, VS, XS etc) has an RJ50 port (looks like RJ45) this cable will work.
Back-UPS ES Back-UPS ES