# Connect a scale

:::{important}
- In EU member states, [certification is legally required](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv%3AOJ.L_.2014.096.01.0107.01.ENG)
  to use a scale as an integrated device.
- Odoo is not certified in several countries, including France, Germany, and Switzerland. If you
  reside in one of these countries, you can still use a scale but without integration into your
  Odoo database. Alternatively, you can acquire a *non-integrated* certified scale that prints
  certified labels, which can then be scanned into your Odoo database.
:::

To connect a scale to the IoT system, use a USB cable. In some cases, you may need a serial-to-US
adapter to complete the connection. If the scale is [compatible with an IoT system](https://www.odoo.com/page/iot-hardware), no additional setup is required; the scale is
automatically detected as soon as it is connected. If the scale is not detected, reboot the IoT box
or {ref}`restart the Windows virtual IoT service <iot/windows_iot/restart>` and {ref}`update the
scale's drivers <iot_updating_iot/handlers>`.

:::{note}
If the scale still does not function after updating the drivers, it might not be [compatible with
the Odoo IoT system](https://www.odoo.com/page/iot-hardware). In such cases, a different scale
must be used.
:::

Once the scale is connected to the IoT system, follow these steps to configure it in the POS
settings:

1. {ref}`Access the POS settings <configuration/settings>` and select your POS, or click the
   vertical ellipsis button ({guilabel}`⋮`) on a POS card and click {guilabel}`Edit`.
2. Scroll down to the {guilabel}`Connected Devices` section and enable {guilabel}`IoT Box`.
3. Select the scale in the {guilabel}`Electronic Scale` field.
4. Click {guilabel}`Save`.

:::{seealso}
{doc}`Connect an IoT system to a POS </applications/sales/point_of_sale/configuration/pos_iot>`
:::

The scale is then available in all the {doc}`POS's sessions </applications/sales/point_of_sale>`.
If a product is configured with a price per weight, selecting it on the {guilabel}`PoS screen` opens
the scale popup. The cashier can then weigh the product to automatically add the correct price to
the cart.

```{image} scale/scale-view.png
:alt: Electronic Scale dashboard view when no items are being weighed.
:scale: 80%
```

## Ariva S scales

For Ariva S series scales (manufactured by Mettler-Toledo, LLC.) to function with IoT systems, a
specific setting must be modified, and a dedicated Mettler USB-to-proprietary RJ45 cable is required.

:::{important}
The official Mettler USB-to-RJ45 cable (Mettler part number 72256236) must be used. Contact
Mettler or a partner to purchase an authentic cable. **No other** cable works for this
configuration.
:::

To configure the Ariva S scale for IoT system recognition, refer to page 17 of [Mettler's Setup
Guide for Ariva S series scales](https://www.mt.com/dam/RET_DOCS/Ariv.pdf) and follow these steps:

1. Hold the **>T\<** button for eight seconds, or until {guilabel}`CONF` appears.

2. Press **>T\<** until {guilabel}`GRP 3` appears, then press **>0\<** to confirm.

3. Under {guilabel}`3.1`, ensure the setting is set to {guilabel}`1` (USB Virtual COM ports) and
   press **>T\<** to cycle through the options under group 3.1.

4. Once {guilabel}`3.1` is set to {guilabel}`1`, press **>0\<** to confirm the selection.

5. Continue to press **>0\<** until {guilabel}`GRP 4` appears.

6. Press **>T\<** until {guilabel}`EXIT` appears.

   :::{important}
   Do **not** make any other changes unless otherwise needed.
   :::

7. Press **>0\<**.

8. Press **>0\<** again to {guilabel}`SAVE`; the scale restarts.

9. Reboot the IoT box or {ref}`restart the Windows virtual IoT service <iot/windows_iot/restart>`.
   The scale should then appear as `Toledo 8217`, as opposed to the previous display, where it
   appeared as `Adam Equipment Serial`.