Firmware v3 overview

Firmware v3 for Smart Meter Modbus RTU adapters, including the Custom Modbus mapping expert feature.

Firmware v3 is the current software generation for all Smart Meter Modbus RTU adapters, including P1 Modbus Pro (NRGD) and D1MC. It retains the selectable standard Modbus mappings and Device Manager workflow from v2, and adds a custom mapper for systems whose required register layout is not available as a standard profile.

Firmware v3 is available for every current Smart Meter Modbus RTU adapter. Firmware v2 remains available for existing installations.

Main V3 features

• Custom Modbus mapping: create a register layout for a controller, inverter, charger or energy-management system that is not covered by a supplied profile.

• Verified starter mappings: start from a Smartstuff-provided SDM630, inverted SDM630 or P1M floats mapping, then adapt it for the installation.

• Import and export: save a custom mapping as JSON, share it with an installer or keep it as a backup before changing it.

• Persistent custom profile: one custom mapping is stored on the adapter and can be selected as its active Modbus mapping.

• Flexible register handling: choose the register address, smart-meter value, scale, signed or unsigned data type and 32-bit word order. You can choose whether registers outside the mapping return zero or a Modbus error.

• Improved data foundation: the internal energy-data model has been renewed while preserving the established behaviour of the standard mappings.

Device Manager navigation

After connecting, the Device Manager shows Refresh and Save in its secondary navigation bar. Firmware v3 adds Custom mapping · Expert there. The button is available only when the connected adapter confirms that it supports the mapper; it is not shown on firmware v2.

The custom-mapper entry point in the firmware v3 Device Manager.

Standard mappings remain available

V3 does not replace the standard mappings. Choose the supplied mapping when it exactly matches the connected system; it is the simplest and supported choice. Use a custom mapping only when no supplied mapping fits, or when the target system requires a small, well-understood variation.

The available standard profiles also include SDM120 - Total system in v3, in addition to the profiles documented for firmware v2. The Device Manager shows the profiles supported by the connected adapter.

Getting started

1. Install the V3 Alpha with the web installer.

2. Connect the adapter and first select a standard mapping if one fits the target system.

3. If it does not, open Custom mapping · Expert in the Device Manager.

4. Start with a verified mapping or create one, validate it and upload it to the adapter.

5. Select the uploaded Custom mapping as the active Modbus mapping and test the registers with the connected system.

For the complete workflow, limits and important compatibility notes, see Custom Modbus mapping.