... value from RS485 3. Multif-tariff, demand PMAC903 Universal Power Meter Features:1. Suit for 220V AC low voltage system2. 6 ... materials9. Spring type buckle, easy to install PMAC903 Universal Power Meter Basic Function 1. Measure and display kWh value2. One RS485 ... : V, I, P, Q, S, PF, F PMAC903 Universal Power Meter Optional Function 1. Multi-tariff2. Reactive energy measuring3. Demand analysis ...