1 About the P1 Ultra and P1 Ultra Pro

1.1 Device description

The device collects data from the smart meter and converts the meter communication into TCP/IP communication. It forwards the data to the Reduxi Controller.

The P1 Ultra Pro also supports LTE via a SIM card and an external LTE antenna. For the LTE configuration, see ⁠Point 4⁠.

The supported interface and communication protocol depend on the smart meter model and the country.

1.2 Supported meter interfaces and communication protocols

Meter interfaces:

• P1 / HAN / I1
• TTL (P1) via RJ12
• M-Bus via 2-wire connection, RJ12 or RJ45
• RS485 via 2-wire connection

Communication protocols:

• DSMR (IEC 62056-21)
• DLMS/DSLM Push

Check the list of supported smart meter models: List of supported devices.

2 Required equipment

You need the following components:

• Reduxi P1 Ultra or P1 Ultra Pro
• Power supply for the device
• RJ12 cable (supplied) or a cable with the same wire sequence on both ends (1:1 connection)
• Smart meter with an activated HAN/P1 port
• P1 Ultra Pro with LTE: active SIM card and external LTE antenna
• Reduxi Controller in the same network
• Laptop or tablet with internet access to configure the device in Reduxi

3 Connect the device to the smart meter

3.1 Device connections

Connections of the P1 Ultra

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Diagram of the P1 Ultra connections. Top: outline drawing of the device seen from the connector side with labels PWR (USB-C port), RS485 with terminals GND, A, B, 5V, and P1 / HAN (RJ12 socket). Below, a connection diagram. Left: Power Supply (power plug icon) connected by an arrow line to PWR (USB-C). Middle: RS485 terminal block with terminals GND, A, B, 5VDC; arrows from GND, A and B lead down to the labels GND, RS485_B and RS485_A (5VDC has a short line without an arrow). Right: P1/HAN, RJ12 connected by a line labelled P1 (RJ12 - TTL) M-bus to a Smart Meter (meter icon).

3.2 P1 / HAN (RJ12)

This communication connector connects the device to the smart meter. Connect it to the activated HAN/P1 port of the smart meter with the supplied RJ12 cable.

Check which smart meters are supported:

3.3 M-Bus

The P1 Ultra and P1 Ultra Pro communicate with compatible smart meters via M-Bus. You can connect M-Bus with:

• a 2-wire M-Bus connection: pin 3 – M-Bus +, pin 4 – M-Bus –
• an RJ12 connector
• an RJ45 connector

Connect the two M-Bus wires from the smart meter to pins 3 and 4 of the RJ12 connector.

3.4 Connect to the smart meter

4 Configure the P1 Ultra

4.1 Connect to a Wi‑Fi network

1

Power the device

Connect the device to the power supply.

2

Connect to the device network

On your phone or computer, search for the Wi‑Fi network P1WIFI and connect to it.

3

Open the web interface

Open a web browser and go to http://p1wifi.local

4

Log in

Username: admin
Password: printed on the device label.

Sign-in page of the P1 Ultra

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Screenshot of the sign-in page of the P1 Ultra web interface. Reduxi logo (lightning bolt and the word reduxi) with the text P1 - ULTRA 2 below it. Grey Sign-in box with the heading Sign-in. Username: admin. Password: field filled, characters hidden as dots, with an eye icon at the right. Dark button Login.

5

Enter the Wi‑Fi credentials

Enter the credentials of your local Wi‑Fi network. We recommend assigning a static IP address to the device. Then click Save in the bottom-right corner. The device connects to the selected Wi‑Fi network and uses the configured IP address.

Network tab: Wi‑Fi SSID and password

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Screenshot of the P1 Ultra web interface, Network tab. Top tabs: Home, Network (selected, dark), Meter, Services, System. Section Wi-Fi network with a green status badge Connected (signal bars). Use static IP address: toggle labelled No (off). Wi-Fi SSID: input field, empty, with a Wi-Fi scan button at its right, in a red frame. Password: input field, empty, with an eye icon, in a red frame. Section Wi-Fi Hotspot: Hotspot password: input field, empty, with an eye icon. Warning text: This password will be used instead of the default password printed on the device. Buttons at the bottom: dark gear button at the left; dark save (disk icon) button at the right, in a red frame.

4.2 Meter settings

Under the Meter tab, configure:

• Country
• Meter type
• Meter name

If encryption is enabled on the smart meter, also enter the required encryption parameters.

If the meter uses current transformers (CT), click the additional settings icon at the bottom. There you configure the CT and VT ratios.

Meter tab

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Screenshot of the Meter tab of the P1 Ultra web interface. Heading Meter with a red badge Disconnected at the top right. A red frame surrounds the form fields: Country: Slovenia (dropdown); Meter type: Iskraemeco AM550 (dropdown); Meter name: AM550 - Main meter; Meter message structure: Slovenia (dropdown); Meter cipher key (optional): empty; Meter authentication key (optional): empty. Below the frame: Baud rate: 38400 bits/s (greyed); Data bits: 8; Stop bits: 1; Parity: None. Buttons at the bottom: a dark button with two arrows at the left, a dark gear button, and a dark save (disk icon) button at the right, marked with a red frame.

4.3 Services settings

Under Modbus, select one of the two communication options.

Option 1: Modbus TCP/IP

Modbus TCP/IP

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Screenshot of the Modbus section of the P1 Ultra settings. Heading Modbus with a blue badge Active at the top right. Enable: toggle labelled Yes (on). A red frame surrounds two dropdowns: Modbus mode: TCP/IP; Modbus register structure: Reduxi.

Option 2: Modbus RTU (RS485)

Modbus RTU (RS485)

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Screenshot of the Modbus settings of the P1 Ultra, mode RTU. Enable: toggle labelled Yes (on). Modbus mode: RTU (dropdown, in a red frame); Modbus register structure: Reduxi (dropdown, in the same red frame). A separate red frame marks a dark settings button (gear icon) at the right. Second row: Device address: 1; Baud rate: 115200 bits/s; Data bits: 8; Stop bits: 1; Parity: None.

4.4 LTE connection (P1 Ultra Pro)

The P1 Ultra Pro also supports LTE with a SIM card and an external LTE antenna.

1

Insert the SIM card

Insert an active SIM card into the P1 Ultra Pro.

SIM card slot

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Render of the P1 Ultra Pro circuit board seen from the side. Beige-edged board with blue underside, two gold antenna connectors standing up on the board (left and right), a small red-orange component with a pink centre between them, a white connector at the left and a grey connector at the lower left, and gold pins along the underside. A red rectangle marks the SIM card slot, a flat metal component on the underside of the board in the middle. No text visible.

2

Connect the antenna

Connect the external LTE antenna.

3

Enable the mobile network

Enable Mobile network.

Mobile network settings

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Screenshot of the Mobile network settings of the P1 Ultra Pro. Heading Mobile network. Enable: toggle labelled Yes (on). Fields: PIN: empty, with a grey example text in the field (value not written here); APN: empty, with grey placeholder text internet; Username: empty; Password: empty, with an eye icon.

4

Enter the APN

Enter the APN settings required by your mobile operator.

5

Enter the access data

If the operator requires it, enter the username, password and SIM PIN.

6

Save

Save the configuration and check that the LTE connection is active.

The required APN settings depend on the mobile operator.

5 Log in to the Reduxi web interface

You can open the Reduxi web interface in two ways:

Activate the tunnel connection (step 3)

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Screenshot of three Reduxi mobile app screens side by side, with cyan boxes and number badges 2 to 4. Left screen (dashboard, dark theme): menu icon at top left marked with a box and badge 2; 'reduxi' logo; tabs 'Real time data' (active) and 'Statistics'; price 5.79 € and temperature 3.2 °C; energy flow diagram with a house in the centre (-1.25 kW) and icons with values 69.0 W, 1.3 kW, 1.1 kW (red ring), -165.0 W with 97 % (red ring) and 0.0 W values at the bottom; tabs 'Power' and 'Energy'; bottom navigation: Dashboard, Diagnostics, Device control, Settings. Middle screen (side menu): 'reduxi' logo, 'Number of locations: 1233', heading 'Reduxi device management', entries '+ Add Reduxi location' and 'Reduxi devices' (marked with a box and badge 3), then 'My profile' and 'About app'. Right screen (device page): Back; picture of a black Reduxi controller with two Ethernet ports; status 'Connected'; card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'; card 'Connect to configurator': 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' with button 'Activate tunnel connection' (marked with a box and badge 4); card 'Unit details' with field 'Unit ID'.

Open configurator (step 4)

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Screenshot made of two parts side by side. Left part: Reduxi mobile app screen on a dark background. Top: Back button; picture of a black Reduxi controller with two Ethernet ports and a terminal block; status 'Connected' with a Wi-Fi icon. Card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'. Card 'Connect to configurator' with a key icon: 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' and button 'Open configurator', marked with a cyan box and number badge 5. Below: card 'Unit details' with a field 'Unit ID' (value not visible). Right part: Reduxi Configurator opened in a browser, marked with a cyan frame and number badge 6. Header: back arrow, 'Tunnel connection', reload icon. Left sidebar with icons (lightning, chip, lightning bolt, bar chart, gear). Page 'Home' with a green link icon. Green notice: 'New patch available. Click here to apply.' with a close X. Time 09:12:56. Energy flow diagram with a house in the centre (1.700 kW) and icons for grid (0.000 kW), solar (1.700 kW), battery (green, 0.000 kW and 0.800 kW), a device at left (0.900 kW), electric vehicle and a charger or device at bottom. Label 'Energy manager' at the bottom.

Reduxi Controller login screen

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Screenshot of the Reduxi Configurator login page in a Chrome browser window. The address bar shows 'Not secure' and 'reduxi.local'; the address bar is marked with a cyan box and an enlarged copy of it (cyan box, text 'Not secure reduxi.local') is shown at the left, connected by a cyan line. Page background: light grey line drawing of a house with solar panels (green), a wall box, an inverter, a car and a charger. Top left: 'reduxi configurator' logo. Login box in the centre with title 'Login', a language selector (English flag, 'English'), a username field and a password field, and a dark 'Login' button.

Controller web interface after login

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Screenshot of the Reduxi Configurator web interface after login, light theme. Top left: 'reduxi configurator' logo. Header bar: 'Home' at left, green 'Connected' status at top right. Left sidebar: expanded section 'Devices' with a list of entries, then collapsed sections 'Manager' and 'Configuration' and 'Settings'. Main area: energy flow diagram. House in the centre with ring, value 24.20 kW. Grid icon at top left, 24.20 kW (red dot on its line). Solar icon at top right, value '-'. Left icon (battery or device), 6.700 kW (green dot on its line). Right icons (battery storage and a device), values '-'. EV charger icon at bottom left, 31.00 kW. A further device icon at bottom right. Label 'Energy manager' below the house.

6 Add the P1 Ultra to Reduxi

Use these steps to add a new P1 Ultra or to edit an existing one.

6.1 Basic settings

Log in to the Reduxi Configurator (see ⁠Point 5⁠) and click + Add device.

The Add device button

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Screenshot of the left menu of the Reduxi Configurator under the reduxi Configurator logo. Menu entries: Devices (expanded, with a minus sign) containing the button '+ Add device' (outlined); Strategies (plus sign); Utility Rate Plan; Settings (plus sign). The right side is blank white.

Select the basic settings.

Basic settings

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Screenshot of the Reduxi Configurator form Basic settings, cropped at the right edge. Fields: Device type *: Energy meter; Type *: P1 WiFi / Ultra; Name *: P1 WiFi / Ultra. Section Include to strategy with a table whose visible rows are Strategy (header row) and Energy manager (the columns to the right are cut off). Button Back at the bottom left.

6.2 Communication settings

In the communication channel settings, enter the parameters that match your connection to the smart meter.

Communication settings

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Small screenshot of the Reduxi Configurator form Communication channel. Field Connection * is a dropdown with the current value TCP/IP and an open list with three options: TCP/IP (highlighted), Local serial port, MQTT. Below the list a label Port * is partly visible (cut off).

Example for TCP/IP:

TCP/IP example

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Screenshot of the Reduxi Configurator form Communication channel and device configuration (TCP/IP example). Fields: Connection *: TCP/IP (dropdown, focused with blue outline); IP *: p1wifi.local, with a black button Scan for IP at the right; Port *: 502, with a black button Test port at the right; Extended IP recovery (info icon): toggle labelled Yes (on); Modbus unit ID *: 1. Buttons at the bottom: Back (left), Test communication and Done (black, right).

You can enter p1wifi.local or the IP address that you configured in the P1 Ultra web interface.

6.3 Test communication

Click Test communication at the bottom of the wizard. It reads the P1 Ultra once and saves nothing. If the test succeeds, click Done: only Done creates the device.

The Test communication button

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Screenshot of the bottom button bar of a Reduxi Configurator page. Left: button 'Back'. Right: button 'Test communication' (marked with a cyan box) and dark button 'Done'.

The Done button

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Screenshot of the Reduxi Configurator page 'Communication channel and device configuration'. Connection *: TCP/IP (dropdown). IP *: 192.168.50.243, with button 'Scan for IP'. Port *: 502, with button 'Test port'. Modbus unit ID *: 1. Buttons at the bottom: Back (left), Test communication and Done (right). The Done button is marked with a cyan box.

If the test fails, check:

• RJ12 cable connection
• Wi‑Fi connection
• IP address
• Message structure
• HAN port activation on the smart meter

7 Check the readings

7.1 Last measurements

After communication is established, check the values under Devices in the Reduxi Configurator as an additional test.

7.2 Enable control by Reduxi

To use the meter data in the Reduxi strategy, check the device settings under Devices in the Reduxi Configurator.

To achieve maximum flexibility and energy cost reduction with dynamic prices and dynamic tariffs, define a strategy as described in Strategies for Reduxi controller.

8 LED indicators and factory reset

8.1 LED indicators

The LED indicators show the current status of the device:

8.2 Factory reset

We recommend a factory reset:

• when you replace the smart meter
• when you change the installation location
• when you have connection problems
• before you reconfigure the device

9 Troubleshooting

If communication does not work, check the following points.

9.1 Connection to the smart meter

• The HAN/P1 port must be activated.
• The RJ12 cable must be connected properly.
• The cable must use a 1:1 wiring configuration.

9.2 Access to the converter

Try to open http://p1wifi.local or the IP address of the converter.

9.3 Local network

• The converter must be in the same network as the Reduxi Controller.
• Check the Wi‑Fi signal strength.

9.4 Configuration

Check:

• the IP address of the converter
• the message structure
• the selected smart meter model

9.5 Factory reset

If these steps do not solve the problem, perform a factory reset (see ⁠Point 8⁠) and configure the device again.

9.6 Smart meters with several HAN/P1 communication types

Some smart meters support several HAN/P1 communication types. If you have communication problems, check:

• whether the HAN port is activated
• which communication protocol the smart meter uses
• whether you selected the correct smart meter model in the Reduxi Configurator

✓ Summary

→ Common issues

→ Related articles

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