1.Measure 3U,12I etc. 2.LCD display 3.RS485 port,Modbus protocol 4.DO+DI Model Descriptions for FunctionsNoteYD2080Three-phase voltage, frequency in one circuit, each phase current, power, power factor, energy in three circuits, with 3DI+1DO. YD2080-2Three-phase voltage, frequency in one circuit, each phase current, power, power factor, energy in two circuits, with 3DI+1DO. YD2080-4hree-phase ...