The OBIS code is a unique identification of the registers in the meter’s memory according to IEC 62056-61. Particularly when setting the initial states of the pulse counters, it is important to know which register to write. OBIS code Description 1. Active energy registers: 1.8.0 Positive active energy (A+) total [kWh] 1.8.1 Positive active energy (A+) in tariff T1 [kWh] 1.8.2 Positive active energy (A+) in tariff T2 [kWh] 1.8.3 Positive active energy (A+) in tariff T3 [kWh] 1.