> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/hardware/card-readers/mms-dyna-devices/dynaprox/documents/programmers-manuals/programmers-manual-commands/commands/user-interface/read-barcode.md).

# Read Barcode

## Command 0x1804 - Read Barcode (BCR Only)

The host uses this command to direct the device to arm or disarm the barcode reader for reading a barcode outside the scope of a transaction. This is an immediate directive. To read barcodes within the scope of a transaction, use **Command 0x1001 - Start Transaction** and its barcode reader parameters instead.

The sequence of events is as follows:

{% stepper %}
{% step %}
The host ensures the device is not currently running another command, for example, that it is not running a transaction using **Command 0x1001 - Start Transaction**.
{% endstep %}

{% step %}
The host composes a command request in the format below and sends it to the device.
{% endstep %}

{% step %}
If the device has a display, it shows a prompt **SCAN BARCODE**.
{% endstep %}

{% step %}
The device enables the barcode reader.

#### If the Timeout parameter is set to Infinite:

* The device returns a command response message with Response Status, Operation Status Summary byte set to 0x00 (OK, Done) after which the host is free to send further commands.
* The host may end the barcode reading session by calling this command again with the **Enable** parameter set to **Disable**.

#### If the Timeout parameter is set to a value other than Infinite:

* The device returns a command response message with its Response Status, Operation Status Summary byte set to 0x01 (OK, Started / Running).
* While the host is waiting for the timeout to expire, it should not send any commands to the device, because the device is busy processing the current command.
* After the device reads a barcode or the timeout period expires, the device sends **Notification 0x1805 - User Interface Operation Complete** to report Barcode Reader / Read Barcode Result and additional supporting information.
  {% endstep %}
  {% endstepper %}

## Table - Request Data for Command 0x1804 - Read Barcode (BCR Only)

<table><thead><tr><th>Tag</th><th width="75.3333740234375">Len</th><th width="256.66668701171875">Value / Description</th><th width="74.33331298828125">Typ</th><th width="76">Req</th><th width="96.666748046875">Default</th></tr></thead><tbody><tr><td>Beginning of any wrappers, at minimum including <strong>Request Message</strong> </td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>1804 = <strong>Command 0x1804 - Read Barcode (BCR Only)</strong></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>81</td><td>01</td><td>Enable<br>- 0x00 = Disable. The device disables the barcode reader. In this case, the device ignores all other parameters.<br>- 0x01 = Enable. The device enables the barcode reader.</td><td>B</td><td>R</td><td>0x00</td></tr><tr><td>82</td><td>01</td><td>Timeout<br>- 0x00 = Infinite. The device leaves the barcode reader enabled until it reads a barcode, or until the host sends this command again to disable the barcode reader.<br>- All other values = Timeout in seconds for the device to leave the barcode reader enabled without reading a barcode.</td><td>B</td><td>O</td><td>0x00</td></tr><tr><td>83</td><td>01</td><td>Encrypt Barcode Data<br>- 0x00 = Do Not Encrypt. The device does not encrypt the barcode data when it sends <strong>Notification 0x1805 - User Interface Operation Complete</strong>.<br>- 0x01 = Encrypt. The device encrypts the barcode data when it sends <strong>Notification 0x1805 - User Interface Operation Complete</strong>.</td><td>B</td><td>O</td><td>0x00</td></tr><tr><td>End of any wrappers, at minimum including <strong>Request Message</strong> </td><td></td><td></td><td></td><td></td><td></td></tr></tbody></table>

## Table - Response Data for Command 0x1804 - Read Barcode (BCR Only)

<table><thead><tr><th>Tag</th><th width="74.6666259765625">Len</th><th>Value / Description</th><th width="75">Typ</th><th width="75.33331298828125">Req</th><th width="98">Default</th></tr></thead><tbody><tr><td>Beginning of any wrappers, at minimum including <a href="https://magtek.gitbook.io/magtek-pilot-gitbooks/internal-documentation/index/3.0-messages-requests-responses-notifications-and-files/3.3-message-structure#table-12-response-message-format"><strong>Response Message</strong> </a></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>1804 = <strong>Command 0x1804 - Read Barcode (BCR Only)</strong></td><td></td><td>No parameters.</td><td></td><td></td><td></td></tr><tr><td>End of any wrappers, at minimum including <a href="https://magtek.gitbook.io/magtek-pilot-gitbooks/internal-documentation/index/6.0-commands/6.3-command-group-0x18nn-user-interface/6.3.4-command-0x1804-read-barcode-bcr-only"><strong>Response Message</strong> </a></td><td></td><td></td><td></td><td></td><td></td></tr></tbody></table>

## Table - Request Example

{% code title="Example (Hex)" %}

```
AA00 810401031804 840B 1804 810101 82010F 830101
```

{% endcode %}

## Table - Response Example

{% code title="Example (Hex)" %}

```
AA00 810482031804 820401000000
```

{% endcode %}


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