... SMT techniques. 1. Brief IntroductionDDS854 single phase electronic energy meter is intended for electric energy measurement and registration in single ... 2.6 May extend Communication port, such as RS485, RS232, IR (infrared radiation) etc.2.7 simple structure, small volume, ... 0.5VA 4. GuaranteeWe are professional energy meter manufacturer. We certify that the meter gurantee period is 18 months. DDS854 ...