... are widely being used in kinds of control system, SCADA system and power management system. 2.Technical Measure- Measurement: VL1, VL2, VL3 ... ,AL1, AL2, AL3, F,∑P, P1,P2,P3, ∑Q, Q1,Q2,Q3,∑S ... ~ +45C;Storage T: -20C ~ +70C- Relative humidity: 5% ~ 95% (no condensation) - Altitude: < 2500m 3. Options- Communication (/C) :RS485 (Modbus-RTU); 1 start ...