# LF

## Overview

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

## Supported Devices

`ASR-L70D`

## Classes & Protocols Used

```{list-table} Classes & Protocols
:header-rows: 1
:widths: 25 15 60

* - Name
  - Type
  - Description
* - [`AsReaderLfDevice`](./13_AsReaderLfDevice.md)
  - Class
  - Main class for controlling the LF reader
* - [`LFTagParser`](./11_LFTagParser.md)
  - Class
  - Class that parses tags and extracts structured information from binary data
```

## Initialization and Connection

```objectivec
AsReaderLfDevice* device = [[AsReaderLfDevice alloc] init];
device.delegateLf = self;
```

- `delegateLf`: Set to receive reading events.

## Start and Stop Reading

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

## Receiving Reading Results

```objectivec
- (void)receivedBarcodeData:(NSData *)data {
    // lfTag LF tag data
}
```

* Implement as a method of `AsReaderLfDeviceDelegate`.

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

13_AsReaderLfDevice.md
Delegate <14_AsReaderLfProtocol.md>
11_LFTagParser.md
```