> For the complete documentation index, see [llms.txt](https://docs.voltmasters.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voltmasters.io/device-integrations/energy-meters/fluvius/residential-meter-p1-port-only.md).

# Residential meter ( P1 Port Only)

Our EMS can read the Belgian digital meter installed by Fluvius through its **P1 port**. This is the user port available on residential digital meters, exposing real-time consumption and injection data.

A P1 reader connected to this port forwards the meter data to our EMS, where it is used as a measurement reference.

{% hint style="danger" %}
**Caution**

Crucial: Activate the P1 Port first! By default, the User Port (P1) on the digital meter is **closed**. The Controller cannot detect the meter if the port is not active.

1. Log in to [mijn.fluvius.be](https://mijn.fluvius.be/).
2. Go to **Producten & Diensten** > **Verbruik** > **Beheer poorten**.
3. **Enable** the P1 port.
4. **Check the display on the meter:** A small triangle arrow (▼) must be visible above the text **"P1"**. If this arrow is missing, the port is dead.
   {% endhint %}

### Connection <a href="#connection" id="connection"></a>

#### 1. Wiring <a href="#id-1-wiring" id="id-1-wiring"></a>

Connect the Digital Meter to the Controller using a **P1 Cable** (USB to RJ12).

1. Locate the yellow rubber cover labeled **P1** on the right side of the meter.
2. Plug the **RJ12 connector** into the P1 port.
3. Plug the **USB connector** into the Controller.

{% hint style="warning" %}
**Warning**

P1 vs S1 Do **not** use the **S1** port (often an RJ45 port on top). This is for the grid operator only. You must use the **P1** user port on the side.
{% endhint %}

### Troubleshooting <a href="#troubleshooting" id="troubleshooting"></a>

<table><thead><tr><th width="191.27276611328125">Problem</th><th>Possible Cause &#x26; Solution</th></tr></thead><tbody><tr><td><strong>Meter not found</strong></td><td><strong>P1 Port inactive:</strong> Check the Fluvius portal. Is the arrow (▼) visible above "P1" on the LCD display?</td></tr><tr><td><strong>Meter not found</strong></td><td><strong>Wrong Port:</strong> Ensure the cable is in the P1 port (RJ12), not the S1 port.</td></tr><tr><td><strong>Meter not found</strong></td><td><strong>Cable issue:</strong> Use a verified P1 cable. Standard telephone cables often do not work because the signal lines are inverted.</td></tr></tbody></table>

### EMS functionality

With the current integration, our EMS enables:

* Real-time monitoring of grid consumption and injection
* Use of the meter as a reference point for control strategies such as self-consumption optimization and capacity management

For larger installations measured on the **A1 port**, see [Industrial meter (A1 Port Only)](/device-integrations/energy-meters/fluvius/industrial-meter-a1-port-only.md).


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