... ,harmonics measurement,events records 3.DI,DO. 4.CE. Multi-function Power Anayzer Meter:IntroductionYD2202 is a new mullti-functional power ... ,ModBus-RTU protocol.Expansion ModuleMore than 10 models of Expansion modules to match with YD2202 as DI,DO,Energy pulse and ... ) :< 4VAWorking Conditions Temp.:-15-55Humid: 20-95% (without condensation) Multi-function power analyzer meter