# Connect a 3rd Party Reader with OSDP

You can connect a third-party reader to any Verkada ACU via RS-485 using OSDP v2.2 for improved data integrity. All Verkada ACUs fully support third-party OSDP readers.

Alternatively, third-party readers that only support Wiegand can be connected using the ACU's Wiegand reader ports. See [Wire a Door to a Verkada Access Controller](/access-control/installation/wire-a-door-to-a-verkada-access-controller.md) for more information.

{% hint style="danger" %}
OSDP communication between Verkada ACUs and third-party readers **is not** encrypted. However, all Verkada readers support fully encrypted communication with Verkada ACUs.
{% endhint %}

***

## Configuration

* Readers must be set to channel address 0
* Communication baud rate must be set to 38400
* Wires must be terminated into A-B of a given door port

{% hint style="warning" %}
The following are common equivalent naming conventions:

* A, White, A+, TX+, HID-GPIO1, HID-Red/Green
* B, Green, B-, TX-, HID-GPIO2, HID-Tan
  {% endhint %}

### Optional settings

These settings should be configured if available:

* Setup mode ON
* Encryption enforcement OFF

{% hint style="warning" %}
LED feedback is red for access rejected and green for access granted. When idle, the reader displays white if supported. These colors cannot be changed.
{% endhint %}

***

## Compatibility

Only readers that can be configured to address 0 and baud rate 38400 directly from the reader or its manufacturer’s management interface are supported.

The following reader models and firmware have been verified for OSDP communication with Verkada ACUs. Contact Verkada Support for compatibility options if your reader is not listed.

|                  |                                                     |                      |
| ---------------- | --------------------------------------------------- | -------------------- |
| **Manufacturer** | **Model**                                           | **Firmware Version** |
| HID              | <p>R Series</p><p>(Requires HID BTSmart Module)</p> | R8.10.2.7            |
| HID              | Signo Series                                        | R10.0.9.1            |


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