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| Functional item | Legal software part | Nonlegal software part |
|
| 1 | Measurement of electrical parameters (such as voltage, current, active power, reactive power, and frequency) | Calculation, storage, and freezing of electric energy rate (including setting of rate and time period) |
| 2 | Measurement of electrical energy (e.g., active energy and reactive energy) | Calculation and storage of maximum demand (including the maximum demand of each rate) |
| 3 | Or clock maintenance | Display mode and display of nonlegal related content |
| 4 | Protection of proprietary parameters of equipment | In addition to the legal system related functions of the event record |
| 5 | Freezing of electrical parameters and energy data | Implementation of external data communication interface (such as infrared, RS485, carrier, wireless, etc.) |
| 6 | Event records of clearing, upgrading, timing, and modifying equipment-specific parameters | Control function (such as control of load switch) |
| 7 | Software interface between legal related software and non-legal related software | Alarm function |
| 8 | Methods to ensure the safety of functions related to legal system | Cost control function |
| 9 | Identification of legal-related software | Other functions not mentioned |
| 10 | Display of legal related contents | — |
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