# Residential meter (P1 port only)

> Read the Belgian Fluvius digital meter through its P1 port. Includes activating the user port, which the grid operator leaves closed by default.

Source: https://voltmasters.io/en/docs/device-integrations/energy-meters/fluvius/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.

> **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.

### Connection

#### 1\. Wiring

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.

> **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.

### Troubleshooting

| Problem | Possible Cause & Solution |
| --- | --- |
| **Meter not found** | **P1 Port inactive:** Check the Fluvius portal. Is the arrow (▼) visible above "P1" on the LCD display? |
| **Meter not found** | **Wrong Port:** Ensure the cable is in the P1 port (RJ12), not the S1 port. |
| **Meter not found** | **Cable issue:** Use a verified P1 cable. Standard telephone cables often do not work because the signal lines are inverted. |

### 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)](https://voltmasters.io/en/docs/device-integrations/energy-meters/fluvius/industrial-meter-a1-port-only/).