... ± 1%Total Harmonic DistortionFor Linear Load ≤ 2%, Non Linear Load ≤ 6%Frequency & Frequency Range50 Hz / Mains 46-54 Hz, Battery Mode ... Mode, Battery Low, UPS fault, Overload, Short Circuit, Over Charge, Charger, Bypass, Inverter fault, Communication faultCOMMUNICATIONInterface and ProtocolStandart DB 9 (Female ...