> 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/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn.md).

# User Interface - Command Group 0x18nn

## User Interface

The host uses these commands to interact with various areas of the device's user interface.

{% hint style="success" %}
Applies to: All Dyna Family products
{% endhint %}

### Information in this group

| **Section**                                                                                                                                                                                                                                           | **Information**                                                                                                                                                                                                                 |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [<mark style="color:red;">**Request Cardholder Signature (Touch Only)**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/request-cardholder-signature-touch-only-command-0x1801.md) | The host uses this command to prompt a cardholder for a signature.                                                                                                                                                              |
| [<mark style="color:red;">**Report Cardholder Selection**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/report-cardholder-selection-command-0x1802.md)                           | The host uses this command to provide a cardholder selection to the device when the device itself does not have a display or inputs to prompt the cardholder for a selection.                                                   |
| [<mark style="color:red;">**Display Message (Display Only)**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/display-message-display-only-command-0x1803.md)                       | The host uses this command to request that the device display a message for the cardholder.                                                                                                                                     |
| [<mark style="color:red;">**Read Barcode (BCR Only)**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/read-barcode-bcr-only-command-0x1804.md)                                     | 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.                                                                                   |
| [<mark style="color:red;">**Buzzer**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/buzzer-command-0x1805.md)                                                                     | The host uses this command to start a buzzer for playing a sequence of tones.                                                                                                                                                   |
| [<mark style="color:red;">**Personal Info Entry**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/personal-info-entry-command-0x1806.md)                                           | The host uses this command to prompt a cardholder for customer information.                                                                                                                                                     |
| [<mark style="color:red;">**LED Control**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/led-control-command-0x1807.md)                                                           | The host uses this command to control the 4 LEDs of the device when the device is not in non-User Control LED states.                                                                                                           |
| [<mark style="color:red;">**Show Image (Display Only)**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/show-image-display-only-command-0x1821.md)                                 | The host uses this command to trigger the device to immediately show a pre-loaded image on the display, provided the device is not in a mode that has exclusive use of the display (such as during a transaction).              |
| [<mark style="color:red;">**Show QR Code (Display Only)**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/show-qr-code-display-only-command-0x1822.md)                             | The host uses this command to direct the device to immediately show a QR code on the display, provided the device is not in a mode that has exclusive use of the display (such as during a transaction).                        |
| [<mark style="color:red;">**Show Bitmap Image (Display Only)**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/show-image-display-only-command-0x1821.md)                          | The host uses this command to trigger the device to immediately show a bitmap file the host includes as a parameter, provided the device is not in a mode that has exclusive use of the display (such as during a transaction). |
| [<mark style="color:red;">**Display Flexible UI Pages (Display Only)**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/display-flexible-ui-pages-display-only-command-0x1830.md)   | This command allows the host to bring up standalone pages.                                                                                                                                                                      |
| [<mark style="color:red;">**Card Emulation**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/commands/user-interface-command-group-0x18nn/card-emulation-command-0x1840.md)                                                     | Card emulation is initiated by receiving a 0x1840 command from the host.                                                                                                                                                        |

### See Also

* <mark style="color:red;">​</mark>[<mark style="color:red;">**Messages**</mark>](https://app.gitbook.com/o/M1bZIjbUULXeTfuFxR7G/s/EX5FnWhqBiMGA8wVt4Kn/messages-requests-responses-notifications-and-files) **-->** The basics on messages, what they are, and how they work.
* [<mark style="color:red;">**Notifications**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/notifications.md) **-->** Information on notices your device my send and the circumstances under which they send them.&#x20;
* [<mark style="color:red;">**Configurations**</mark>](/api-and-command-reference/scra-dynafamily-programmers-manual/configuration.md) **-->** Information of configuring your devices in various ways.


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