24AS400 PORT:Pin# Description I/O1 UPS Fail Output2 Summary Alarm Output3 GND GND4 Remote Shutdown Input5 Common +12V6 Bypass Output7 Battery Low Output8 UPS ON Output9 Line Loss OutputEPO external wiring diagram:7. SERVICE Interface: available only to Eaton service personnel and not open tousers.8. Standard RS232 Interface: applicable to WinPower management software (SeeAppendix for RS232 port Pin definition).1-2: Open = Normal OperationClosed = Emergency Power Off3-4: unused1-2: Permanently connected with jumper wire3-4: Closed = Normal OperationOpen = Emergency Power Off