Installation

Select the installation instructions for your Smart Meter Modbus Adapter.

Connections, power and physical controls differ by hardware. Use the page for your adapter:

• D1MC — DIN-rail hardware with DSMR/P1 and HAN-NVE support, screw-terminal Modbus RTU and flexible 5 V power.

• P1 Modbus Pro (NRGD) — compact adapter with an RS485 module and P1 output. Includes regular NRGD and ZAP2/NRGDH-based implementations with different A/B terminal positions; the latter also supports HAN-NVE using a HAN (RJ45)-to-RJ12 cable.

After installing the hardware, use the Device Manager and follow the shared firmware v2 configuration.

The old white P1 Modbus adapter has a micro-USB connector and a different fixed Modbus terminal pin-out. It has not been sold for years. Do not use its wiring diagram for current hardware; retain existing installation information only when servicing an old unit.

General Modbus RTU checks

• De-energize the installation before changing wiring.

• Match A and B to the labels and instructions for both devices.

• Use a suitable twisted pair and follow the connected equipment manufacturer's requirements for cable length, topology, grounding and shielding.

• Configure the same device ID, baud rate and serial format on the adapter and Modbus master.

• Apply 120 Ω termination only where required by the RS485 bus topology.