Smart Meter Modbus Adapters

Choose, install and configure a Smartstuff smart meter to Modbus RTU adapter.

Smartstuff Smart Meter Modbus Adapters make data from supported smart meters available locally through Modbus RTU. This documentation covers firmware v3 for all current Modbus RTU adapters, firmware v2 for existing installations and legacy firmware v1 installations.

Start by choosing the hardware variant. Connections, power requirements and physical controls differ between adapters. Firmware v3 is available for every current Modbus RTU adapter.

Choose your adapter

D1MC

D1MC DIN-rail adapter.

Choose D1MC for a fixed DIN-rail installation, HAN-NVE support, Modbus RTU screw terminals, flexible 5 V power options and software-controlled RS485 termination.

D1MC currently converts DSMR/P1 and HAN-NVE to Modbus RTU. Its physical Linky TIC/S0 interface is present, but Linky software support is planned and not yet available.

P1 Modbus Pro (NRGD)

P1 Modbus Pro (NRGD).

Choose P1 Modbus Pro for a compact smart-meter-to-Modbus RTU adapter. NRGD is available as a regular implementation and as an implementation based on ZAP2/NRGDH. The latter also supports HAN-NVE with a HAN (RJ45)-to-RJ12 cable. Check the connection sticker on the dongle because their Modbus A and B positions differ.

Hardware and feature matrix

Feature	P1 Modbus Pro (NRGD)	Din rail adapter (D1MC)
DSMR/P1 input	Available	Available
HAN-NVE	Available on the ZAP2/NRGDH-based implementation with a HAN (RJ45)-to-RJ12 cable	Available with adapter cable
Linky TIC hardware	Not available	Interface present; software support planned
Modbus RTU	Available	Available
Software-controlled 120 Ω termination	Not available	Available; enabled by default
USB connection	USB-C	USB-C
Additional 5 V screw-terminal supply	Not available	Available
P1 output	Available	Not available
Firmware v3	Available	Available
Firmware v2	Available for existing installations	Available for existing installations
Firmware v1	Legacy installations only	Not supported

The old white P1 Modbus adapter is intentionally excluded from this current-product matrix. It remains documented only where an older installation or firmware v1 requires it.

Firmware

All current Modbus RTU adapters can use firmware v3. In addition to the standard selectable register mappings, v3 lets an expert create and store a custom Modbus mapping for an unsupported system.

Firmware v2 remains documented for existing installations. Both generations provide configurable Modbus RTU settings and local diagnostics through the USB Device Manager. Hardware-dependent settings appear only when the connected adapter supports them.

Get started

1. Choose and install the hardware variant.

2. Connect to the Device Manager.

3. Configure the meter source and Modbus RTU settings.

4. Select a standard mapping or, with v3, create a custom mapping.