> For the complete documentation index, see [llms.txt](https://help.verkada.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.verkada.com/access-control/users-and-credentials/multi-factor-authentication-mfa-codes/keypad-pincode-formats.md).
# Keypad Pincode Formats
All Verkada access controllers are rated to power readers at 12V up to 250mA via the + (VIN) and – (GND) connection. Verkada readers use the 4-port input (labeled as **RS-485**) while standard Wiegand readers use the 4-port inputs (labeled **wiegand**) and the shared power from the RS-485 connection. Read the steps to [connect the reader](/access-control/installation/wire-a-door-to-a-verkada-access-controller.md) to an access controller.
{% hint style="warning" %}
Verkada Access Controllers accept 4-bit bursts for keypad transmission.
{% endhint %}
{% hint style="info" %}
Please set your reader transmission format according to the settings according to the manufacturer’s manual.
{% endhint %}
***
## Supported Keypad Transmission Formats
Verkada supports the formats outlined below. When you set up your readers to 4 bits for keypad transmission, it will vary based on your model.
**Example: Rosslare AYC-Q60 reader**
For the **Keypad Transmission Format**, use option **9** as its Wiegand 4-bit.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://help.verkada.com/access-control/users-and-credentials/multi-factor-authentication-mfa-codes/keypad-pincode-formats.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.