Introduction
This application note explains the procedure for designing the RS-485 communication lines in energy metering applications which helps e-meter engineers build their projects. Energy meters are used to monitor personal usage of electricity. In the past only one kind of e-meter was used which was an electromechanical device and required human intervention for the periodic on site data collection. The new frontier in energy metering is a new generation of electronic e-meters providing new features such as network data collection, auto-diagnosis and time-scheduled accounting differentiation in order to define different energy costs on differently defined time segments.

ST Microelectronics
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