> For the complete documentation index, see [llms.txt](https://enless.gitbook.io/centre-aide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://enless.gitbook.io/centre-aide/guides-installation/documentation-en/gateway-and-receivers/rx-http/led-behavior.md).

# LED behavior

RX HTTP: LED behavior

The **RX HTTP** has two sets of indicator lights (LEDs) allowing the operating status of the device to be checked without using the software interface.

## Internal LEDs (On the electronic board)

To access these LEDs, it is necessary to open the housing cover. They enable precise diagnosis of data flows.

<table><thead><tr><th width="80.2265625">LED</th><th width="106.01953125">Color</th><th width="118.07421875">State</th><th>Meaning</th></tr></thead><tbody><tr><td>A</td><td><mark style="color:green;">Green</mark></td><td>Flash</td><td><strong>Radio Reception</strong> : A message from a sensor has been received.</td></tr><tr><td>B</td><td><mark style="color:$warning;">Orange</mark></td><td>Flash</td><td><strong>Radio Transmission</strong> : The receiver has transmitted a message.</td></tr><tr><td>C</td><td><mark style="color:green;">Green</mark></td><td>On</td><td><strong>Power Supply</strong> : The board is properly powered.</td></tr><tr><td>D</td><td><mark style="color:$warning;">Orange</mark></td><td>Flash</td><td><strong>Not used</strong></td></tr><tr><td>E</td><td><mark style="color:green;">Green</mark></td><td>Flash</td><td><strong>Not used</strong></td></tr><tr><td>F</td><td><mark style="color:red;">Red</mark></td><td>Off</td><td><strong>Not used</strong> : This LED remains off during normal operation.</td></tr></tbody></table>

## External LED (Housing closed)

A control LED is visible on the outside of the product, located near the power cable gland. It allows the system status to be checked without dismantling the installation.

* Red LED (Status):
  * **Behavior** : A **flash** every minute.
  * **Meaning** : The receiver is active, the internal processor is operating normally (Heartbeat).

{% hint style="info" %}
**Troubleshooting tip** :

* If the **internal LED C** is **off**, **check your power supply** (7.5 - 24VDC) and the **polarity** of the Red/Black wires.
* If the **LED D** and **E** do not blink **ever** during requests from your controller, **check the serial wiring** (RS485/RS232) or the Modbus ID address.
  {% endhint %}


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