APC Back-UPS Pro BP420SC pinouts
APC BackUPS Pro cable pinout APC Part# 940-0095B. Should work with APC PowerChute Pro software.
APC Smart UPS DB9 cable pinout 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)
APC by Schneider Electric, formerly known as American Power Conversion Corporation, is a manufacturer of uninterruptible power supplies, electronics peripherals and data center products.
APC was founded in 1981. APC main focus is power protection devices. They introduced its first UPS in 1984.