For the complete documentation index, see llms.txt. This page is also available as Markdown.
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 the current hardware variants, their shared firmware v2 software layer and legacy firmware v1 installations.
Start by choosing the hardware variant. Connections, power requirements and physical controls differ between adapters; firmware v2 mappings and configuration are shared.
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 v2
Available
Available
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.
Shared firmware
All current adapters use firmware v2. One firmware image provides selectable register mappings, Modbus RTU settings, local diagnostics and updates through the USB Device Manager. Hardware-dependent settings appear only when the connected adapter supports them.
