... the UPSSite wiring fault warningOn-battery power-on functionSmart RS232 communication interfaceIntelligent slot availableSealed ... IndicatorsStatusLoad level / Battery level, Battery , Utility Power, Inverter, Bypass, Overload, FaultAudible AlarmBypass, On battery ... , Battery low, Overload, FaultAcoustic NoiseAt 1 meter distance45 dBA50 dBACommunicationsDB-9 PortRS-232 Serial InterfaceIntelligent ...