62056-21: Cei Iec

The CEI IEC 62056-21 Standard: Powering Local Meter Data Exchange

: It specifies the use of an optical interface (using infrared light) or electrical interfaces like RS-232 or RS-485. The optical port is particularly iconic—the small circular "eye" found on the front of most digital meters. Operational Modes : CEI IEC 62056-21

: These involve fixed or auto-baud rate switching for simple data transmissions. The CEI IEC 62056-21 Standard: Powering Local Meter