> 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/products/rx-lorawan/configuration/modbus-tab.md).

# MODBUS tab

The MODBUS tab allows you to view in real time the exchange table of the g*ateway*. It is the reference tool for the integrator who must map the data to a PLC or a supervisor.

It is divided into two distinct sections according to the origin of the sensors.

<div data-with-frame="true"><figure><img src="/files/e9540d3bbf90bd8aed76b115a5d838c3da186c1a" alt=""><figcaption></figcaption></figure></div>

## Enless Modbus Table

This menu displays the Modbus table for all Enless sensors that communicate with the *gateway*.

### **Navigation and Search**

* **Selection** : A list located on the left side of the screen allows you to select the specific sensor you want to inspect.
* **Search** : A dedicated search field allows you to quickly filter the list by DEVEUI or profile type.

### **Table Detail (Mapping)**

Once the sensor is selected, the table displays the following information for each data point:

<table data-header-hidden><thead><tr><th width="189.1015625"></th><th></th></tr></thead><tbody><tr><td><strong>Register</strong></td><td>Register address number of the Modbus register. This is the value that must be entered in your PLC.</td></tr><tr><td><strong>Hex Value</strong></td><td>The raw data as it is stored in the memory of the <em>gateway</em> in hexadecimal format.</td></tr><tr><td><strong>Decimal Value</strong></td><td>The conversion of the data into a standard numerical value (e.g.: <code>215</code> for 21.5°C).</td></tr><tr><td><strong>Description</strong></td><td>Explicit label of the data contained in the register (e.g.: <code>Temperature</code>, <code>Humidity</code>, <code>RSSI</code>, etc.).</td></tr></tbody></table>

{% hint style="info" %}
In the Modbus table, the **number of pulses** is encoded on two 16-bit registers. The **value** **maximum** of the counter is therefore 0xFFFFFFFF = 4,294,967,295.
{% endhint %}

## Third-party Sensors Modbus Table

This menu displays the Modbus table for all third-party (non-Enless) sensors that communicate with the *gateway*.

For each data point from the third-party sensor, the table displays the following properties:

<table data-header-hidden><thead><tr><th width="195.91015625"></th><th></th></tr></thead><tbody><tr><td><strong>Data</strong></td><td>Description or name of the variable (e.g.: <code>Water pressure</code>, <code>Electrical Index</code>).</td></tr><tr><td><strong>Type</strong></td><td>Type of Modbus register used (e.g.: <code>Holding Register</code>, <code>Input Register</code>).</td></tr><tr><td><strong>Value</strong></td><td>Current value stored in the register (updated at each <em>uplink</em>).</td></tr><tr><td><strong>Address</strong></td><td>Register address number to query in your supervisor.</td></tr><tr><td><strong>Format</strong></td><td>Data encoding (e.g.: <code>uint32</code>, <code>int16</code>). Essential for correctly configuring the reading on the PLC side.</td></tr></tbody></table>

{% hint style="info" %}
The gateway Modbus table is available by following this link: [Modbus table](/centre-aide/ressources/ressources-en/lorawan-gateway/modbus-table.md)
{% endhint %}


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