Comprehensive distribution measuring and controlling instrument supply RS-232/485 serial port 1 and RS-485 serial port 2, serial port 2 is data forwarding port(only for flushbonading), support data forwarding of multifunctional electric meter. Serial port 1 support twisted-pair,Coaxial cable,digital radio, GPRS, can communicate with fibre-optical by MODBUS. It also can communicate with SCADA main station and monitor the distribution lines.