APC Part# 940-0024C, # 940-0024B, # 940-0024D or 940-1524 (black cable). Compatible with most APC UPSs that have a DB9 serial port. Should work with APC PowerChute or Apcupsd (UPS Server for Linux) Back-UPS Pro BP650, BP650S, BP650SC, BP420, BP420S, BP420SC, BP280S (also compatible with 940-0095B cable)Smart-UPS 3G SU420NET, SU620NET, SU700NET, SU1000NET, SU1400NET, SU2200NET, SU3000NET, SU2200XLNET, SU2200XLTNET, SU3000TNET, SU5000T, SU1400RMXL3U, SU2200RM3U, SU2200RMXL3U, SU2200RMXLNET, SU2200RMXLTNET, SU3000RM3U, SU3000RMNET, SU3000RMT3U, SU3000RMXL3U, SU5000, SU5000RMT5USmart-UPS 3.5G SU700RM2U, SU1000RM2U, SU1400RM2USmart-UPS 3.6G (Serial) SUA1000, SUA1500, SUA750XL, SUA1000XLSmart-UPS 4.0G (Serial) SUA2200, SUA2200RM2U, SUA3000, SUA3000RM2U, SUA3000RMT2USmart-UPS SC SC420, SC620Matrix MX3000, MX5000, MX3000XR, MX5000XR