---
title: Overlay temperature or presence on a Chart’nX meter chart
description: Add a temperature line or a presence band to a Chart’nX meter chart, declare its overlay source, and choose where a submeter appears.
canonical: https://wiki.can-nx.com/en/guides/chart-meter-display/
language: en
product: Chart’nX
audience:
  - administrateur
  - installateur
context: "Chart’nX: energy generator, Overlays section and meter or submeter card"
---

# Overlay temperature or presence on a Chart’nX meter chart

Context: Chart’nX: energy generator, Overlays section and meter or submeter card

In the Chart’nX energy generator, an overlay adds a temperature line or a presence band to a meter’s consumption chart. The **Display** boxes of a submeter decide whether it appears in the chart and in the total distribution.

For administrators and installers, from the meter card in **Configure**, once its measurement is filled in as described in [the main meters](https://wiki.can-nx.com/en/guides/chart-meters/). The options offered depend on the card.

## Declare the source to overlay

A source is declared once for the whole dashboard, in the **Overlays** section located below **General**. First check the ones that already exist.

1. Click **+ Add source**, then choose **Outdoor temperature**, **Water temperature** or **Presence / absence**. In this menu, a source already there is marked **already added**; **Custom source…** is for other measurements.
2. In the source card, choose the **Protocol**, then fill in the KNX **Group address**, for example the fictitious **1/2/3**, or the **Modbus Configuration**.
3. For presence, check **High / low state**: on the ▲ row, labeled **Present**, choose the value, **1** or **0**, that the sensor sends when someone is present.

## Add the overlay to the meter

1. In the meter card, under **Overlays**, click **+ Add overlay**.
2. Choose the source: values, such as temperatures, are listed under **Value line**; states, such as presence, under **Band**. A chip appears with the color and the name of the source; its ▾ arrow lets you change it.
3. [Save the dashboard](https://wiki.can-nx.com/en/guides/chart-save/).

To remove an overlay, click the cross on its chip, then save: neither the source nor the physical sensor is deleted. If the source is missing, **Create a source…**, at the bottom of the list, takes you back to the **Overlays** section.

A chart takes at most one **Value line** and one **Band**; the add button disappears once the card has all those it offers:

| Card | Overlays offered |
| --- | --- |
| **General meters - Apparent power** | **Band** only, for example presence |
| **General meters - Total energy consumed** | **Value line** and **Band** |
| Submeter outside a group | **Value line** and **Band** |
| **PV meter**, **Battery meter**, **Grid meter** | None |

In a group, a submeter shows neither **Overlays** nor **Display**: the group has its own overlays, in the **Groups** section.

## Choose where a submeter appears

In the **Display** section of a submeter:

- **Show in chart** controls its chart display;
- **Include in the total pie chart** controls its inclusion in the distribution;
- **Deduct from Reste** (Reste: remainder) is unchecked when this meter is already measured by another submeter (nested meter). It is then already counted elsewhere: **Include in the total pie chart** is unchecked and locked.

These boxes do not delete the submeter. For the order of panels or grouping, see [Groups and order](https://wiki.can-nx.com/en/guides/chart-groups/).

## Check the result

After saving, check the meter’s chart in the dashboard. If the source is declared but the overlay is still missing, check [the period](https://wiki.can-nx.com/en/guides/chart-period/) and the expected measurements.

## Troubleshooting

- A warning symbol on the chip, tooltip **Source incomplete**: in **Overlays**, complete the name, the address and, depending on the kind, the unit or the state labels of the source. As long as it is incomplete, the dashboard cannot be saved.
- Do not modify a sensor or an address used for other purposes to solve a display problem.

For other symptoms, follow the [meter troubleshooting](https://wiki.can-nx.com/en/guides/chart-meter-help/). If the problem persists, contact support@can-nx.com with the dashboard, the card, the chosen overlay and any message.