Installation

Connecting the smart meter

Connect the Dongle to the P1 connection of the smart meter via the supplied P1 cable.

Two hardware models

The black model only has power on the p1 output when a usb adapter is connected. This hardware version will be delivered from May 2025.

There are two hardware types with the Modbus firmware. The white and the black one.

The white version has a micro usb connector and fixed screw terminals.

The back version usb c connector, P1 out and a terminal connector.

From firmware version 1.4.0 both dongle models are supported.

Connect USB Adapter

In most cases, the dongle is powered via the p1 port of the smart meter. If you have older smart meter ( v2/v3 in NL ), a USB power supply + USB cable is necessary.

Every adapter is fine

The USB adapter may be an old smartphone or tablet adapter or a USB connection that is available in the meter cupboard (e.g. from a NAS/Router). Almost all USB adapters are suitable.

Connect RS485

See the Modbus RTU connections below. In most cases the GND shouldn't be connected.

The wireing of the P1 Modbus Pro+ (Black casing) is different.

P1 Modbus Pro dongle

P1 Modbus Pro+/NRG (black version)

LEDs

The available LEDs depend on the hardware variant:

• Power LED: on when the dongle has power. This LED should stay on continuously during normal operation.

• P1 output LED: blinks when the dongle transmits data on the P1 output, if the hardware variant has this LED.

• Status LED: shows boot, ready and error states. Firmware v1 uses the mono status LED. Firmware v2 can use either a mono status LED or an RGB status LED, depending on the hardware.

For firmware v2, see LED indicators for the detailed status LED behaviour per hardware variant.

Button

The button has several functions:

1. Press and hold during powerup = download mode

2. short press (< 5 sec) = reboot

3. long press (>5 sec) = factory reset. All values ​​that are adjusted via the RS485 connection are reset to the default values