From the manufacturer manual
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Energy meters
MFM384
107 registers
Panel mounted three phase multifunction meter for 3 phase 4 wire, 3 phase 3 wire, 2 phase 3 wire and 1 phase 2 wire systems. The communication model (MFM384-C) has an RS485 Modbus RTU port. Its register list covers voltage, current, power, power factor, frequency, energy, maximum and minimum demand, harmonic distortion, and the configuration and reset parameters. The register list has no unit column and the manual states no scaling: power and energy units follow the parameter names printed there (kW, kVA, kVAr, kWh, kVAh, kVArh), and volts, amps and hertz are the units shown on the display.
All register maps · Modbus Poll