# Barcode

## Overview

This chapter explains how to operate the barcode reader function using ``AsReaderBarcodeDevice``.  
You can connect to the device, start and stop reading, and receive reading results.

## Supported Devices

`ASX-510R`, `ASX-520R`, `ASR-010D`, `ASR-020D`,  
`ASR-022D`, `ASR-0230D`, `ASR-0231D`, `ASR-0240D`,  
`ASR-M24D`, `ASR-025S`

## Used Classes and Protocols

```{list-table} List of Used Classes and Protocols
:header-rows: 1
:widths: 25 18 57

* - Name
  - Type
  - Description
* - [`AsReaderBarcodeDevice`](./3_AsReaderBarcodeDevice.md)
  - Class
  - Main class for controlling the barcode reader
* - [`AsreaderBarcodeDeviceDelegate`](./10_AsReaderBarcodeProtocol.md)
  - Protocol
  - Delegate used to receive reading results and others
```

## Initialization and Connection

```objectivec
AsReaderBarcodeDevice *device = [AsReaderBarcodeDevice sharedInstance];
device.delegateDevice = self;
```

- ``delegateBarcode``: Set this to receive barcode reading events.

## Start and Stop Reading

```objectivec
[device startScan:0 readUntilInSec:0];   // Start reading
[device stopScan];                       // Stop reading
```

## Receiving Reading Results

```objectivec
- (void)receivedBarcodeData:(NSData *)data {
    NSLog(@"Read barcode: %@", data);
}
```

*Implement this as a method of the ``AsreaderBarcodeDeviceDelegate`` protocol.*

---

```{toctree}
:maxdepth: 1
:hidden:

3_AsReaderBarcodeDevice.md
Delegate <10_AsReaderBarcodeProtocol.md>
```