# Configure a Second-Generation Intercom as a 1-Door AC

Set up your hardware before you begin the Verkada Command setup.

If you are using any of the second-generation intercoms, see the [install guide](https://www.verkada.com/docs/?product=intercom\&contentType=setupGuide) before you continue.

***

## Verkada reader

Second-generation Verkada Intercoms (TD33, TD53, TD63) include a built-in reader. If you are using a TD52, see [this article](/intercom/configuration/configure-a-video-intercom-as-a-1-door-ac.md) to learn how to install a reader and configure the device as a 1 door access controller.

***

## Output wiring

Second-generation Verkada Intercoms have a dry-form C relay output that you can configure as an access controller. This involves wiring the intercom to an auxiliary power controller and a lock as seen below.

<div align="left" data-with-frame="true"><img src="/files/KvHHgomRUfy5SvQwLhMC" alt=""></div>

***

## Door configuration

{% stepper %}
{% step %}
**Navigate to Intercom Settings > Door.**
{% endstep %}

{% step %}
**Click Add a door**
{% endstep %}

{% step %}
**Select Directly to the Intercom**
{% endstep %}
{% endstepper %}

### Reader

|                              |                                                        |
| ---------------------------- | ------------------------------------------------------ |
| **Badge Reader**             | Toggle RFC and NFC support (doesn't include bluetooth) |
| **NFC Unlock**               | Toggle NFC support                                     |
| **Bluetooth Unlock**         | Toggle Bluetooth support                               |
| **Bluetooth Unlock Trigger** | Set the distance and action required to gain access    |
| **Bluetooth Cooldown**       | Minimum interval between bluetooth door unlocks        |
| **Beep on Bluetooth Unlock** | Beep upon access granted                               |

### I/O

|              |                                        |
| ------------ | -------------------------------------- |
| **Input 1**  | Configure DPI or Call Trigger          |
| **Input 2**  | Configure REX or Call Trigger          |
| **Input 3**  | Configure REX or Call Trigger          |
| **Output**   | Unlock - not mutable in 1 Door AC Mode |
| **Output 2** | Configure Chime or Call in Progress    |

### Unlock

|                   |                                                                          |
| ----------------- | ------------------------------------------------------------------------ |
| **Unlock Time**   | Configure how long door stays open upon unlock                           |
| **Unlock Sound**  | Toggle whether tone is played when door is unlocked by receiver          |
| **Remote Unlock** | Toggle whether eligible users in Command or Pass app can unlock the door |

***

## Assign user access to an intercom door

After you add a door to an intercom in Command, you can [assign access levels in the access control menu](/access-control/users-and-credentials/add-a-user-to-the-verkada-access-system/assign-a-user-access-to-a-door.md).


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