# Add a Door to an Access Controller

A door consists of all the configurations and components connected to an access controller on a particular cassette.

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You must be an Access Site Admin to add a door. Learn more about [Roles and Permissions for Access Control](https://help.verkada.com/access-control/getting-started/roles-and-permissions-for-access-control).
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**On the AC41, there are four cassettes, labeled 1 to 4, that correlate to each door.**

<div align="left" data-with-frame="true"><img src="https://134288481-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FaaHs5RfKqv9Z49mi02cC%2Fuploads%2Fgit-blob-562f1a2d411a71cc30f1ce3d7674af30c8c94356%2Fe260d76eae5f313fddef92200af204ce75a9224d.png?alt=media" alt="" width="516"></div>
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**Configure a door: Find the number of the door wired to the associated cassette.**
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**In Verkada Command, go to All Products > Devices.**
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**Find the Verkada Access Controller you want to add doors to.**
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**At the right, select the access controller.**
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**At the top right, click Add.**
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**From the setup list, click Door.**
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**Follow the configuration steps to add a name and the components that are installed.**
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{% hint style="warning" %}
Only check the **REX** (Request to Exit) or **DPI** (Door Position Indicator) box if they are installed and you want the REX sensor/button to unlock the door (this is typically the case with magnetic locks).
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***

{% hint style="info" %}
**Prefer to see it in action?** Check out the [video tutorial](https://www.youtube.com/watch?v=reGRRopgx7Q).
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