# Operating the serial labeling device

> The keypad, the Wi-Fi indicator, updating the PLU list and printing a label, plus what to do when a code is not recognised.

- **Page** - https://iotready.com/docs/hardware/operation/serial-labeling-device
- **Book** - [Hardware](https://iotready.com/docs/hardware.md)
- **Section** - Operation

## Wi-Fi connectivity

Check if the device is connected to the Wi-Fi by looking for a tick mark at the right-hand corner of the device screen.

**Note 1**: If this is your first time connecting to the internet, see [Configuring Wi-Fi from the Android app](https://iotready.com/docs/hardware/configuration/wi-fi-by-app.md).

**Note 2**: If the date does not match, the PLUs downloaded on the data logger could be outdated. Please refer to the "Updating the PLU List" section.

**Important Note**: The date shown on the top left of the display is the date when the PLU data and price list was last downloaded to the device. It is not a representation of the current date.

### Updating the PLU list

There are two modes for updating the PLU list: **Auto** and **Manual**.

Please ensure the WSDL is connected to Wi-Fi before updating the PLU List.

- **AUTO MODE**: The WSDL downloads the latest PLU list at boot as long as it is connected to the internet.

- **MANUAL MODE**: Please press the **"Enter"** key and then press **"1"**.

### When the device is connected to the internet

- The date shown on the screen is the date of the last successful PLU Update.

- There's a small tick mark on the right-hand corner of the screen.

### Entering PLU list

Using the keypad, enter the specific (numeric) PLU Code for the item that you want to weigh and label.

_If you've entered the wrong value, please press the clear key to re-enter the code._

After entering the code, press **"ENTER"**.

### Fixing errors

If the device does not recognize the PLU Code you entered, please try the following:

- Re-enter the code and verify if the correct PLU is entered.

- If the wrong PLU is entered, please press the clear key to erase your input and re-enter the PLU code.

- Check if the latest PLU Code is updated (refer to the "Updating the PLU List" section).

## Troubleshooting

- If the device during the first boot is stuck on **"No Wi-Fi connected"**, please check the internet connection (see Wi-Fi connectivity above).

- If the label is not printing, check if the weight is changing on the Data Logger screen when changing the weight of the input.

  - If the weight is not changing, check the **RS232 printer cable connection**.

  - If the weight is changing, check if the printer is powered on properly and the **green status light** is stable (not blinking).

- If the wrong price is showing on the labels, please do a manual PLU update (check the "Updating the PLU List" section).

- If the Data Logger is not powering on, please check the power supply.

In case of any issues, please reach out to us at <support@iotready.com>.