... ,CB,ISO9001,14001,IEC 4)OEM GeneralDDSI726 single-phase carrier electronic watt-hour meter is made by the advanced ... energy metering chips and the specialchips for carrier communication manufactured by Qingdao Eastsoft Company through digital sampling ... meter communication Protocol. Function and features2.1 Can realize metering carrier or infrared programming and meter reading; 2.2 LCD ...