From the manufacturer manual
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Other devices
GX devices (Venus OS)
222 registers
Modbus TCP server built into Victron GX devices. It exposes system totals and each connected Victron product under its own unit ID: Multi and Quattro inverter/chargers on VE.Bus, battery monitors and managed batteries, solar chargers, grid meters, PV inverters, tank sensors and the ESS control settings. This file lists 222 selected registers from Victron's register workbook (revision 55); other services in the workbook, such as generator sets, EV chargers, DC/DC converters, alternators, heat pumps, temperature sensors and Multi RS, are not listed here.
All register maps · Modbus Poll