Features: 1. RS485 (communication protocol Modbus-RTU) remote meter reading function. 2. Display and reading: electricity, current, voltage, frequency, power factor 3. Standard configuration pulse output passive (polarity), select remote pulse output passive (non-). It is easy to contact with various systems and conforms to the standards IEC 62053-31 and DIN43864. 4. Double color LED indicates the power status (green) and the energy pulse signal . 5. Automatically detect the flow direction and of the load current 6. One-way measurement of single-phase two-wire active power. 7. Direct S type connection 8. Extend the terminal cover to protect the use. Specification: Condition: 100% New Model: DDM18SD Voltage Specification: 220V Frequency: 50Hz Current Specifications: 5(100)A Communication Method: RS485 Screen Display: Multi-function Cycle Display Accuracy Level: 1.0 Working Temperature: -10 Celsius- +50 Celsius Installation Method: DIN Rail Mounting Communication protocol: MODBUS-RTU, DL/T645-1997, DL/T645-2007 (optional) Weight: . 102g / 3.6oz Colour:white Material:plastic Package Contents: 1 * DDM18SD Energy Meter 2 * Shell Accessories 1 * User manual Small size, light weight and beautiful appearance Good reliability and easy installation 35mm standard DIN rail mounting, in accordance with standard DIN EN50022. Single pole width (modulus 18mm) in accordance with DIN43880. The standard configuration 5+1 backlight LCD display (99999.1KWh)