---
name: "uark"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd", "openbsd"]
url: "https://new.carta.tech/uark"
---

# uark(4)

Arkmicro Technologies ARK3116 based USB serial adapter

## NAME

**uark** – Arkmicro Technologies ARK3116 based USB serial adapter

## SYNOPSIS

**device** **usb** **device** **ucom** **device** **uark**

In [loader.conf(5)](/loader.conf/5.md): **uark\_load="YES"**

## DESCRIPTION

The **uark** driver supports Arkmicro Technologies ARK3116 based serial adapters.

## HARDWARE

The **uark** driver supports the following adapters:

- HL USB-RS232

- HugePine USB-UART

- KQ-U8A Data Cable

- Skymaster USB to RS232

## FILES

- */dev/ttyU\**

  for callin ports

- */dev/ttyU\*.init*

  - */dev/ttyU\*.lock*

  corresponding callin initial-state and lock-state devices

- */dev/cuaU\**

  for callout ports

- */dev/cuaU\*.init*

  - */dev/cuaU\*.lock*

  corresponding callout initial-state and lock-state devices

## SEE ALSO

[tty(4)](/tty/4.md), [ucom(4)](/ucom/4.md), [usb(4)](/usb/4.md)

## HISTORY

The **uark** device driver first appeared in OpenBSD 4.0. The first FreeBSD release to include it was FreeBSD 7.0.

## AUTHORS

The **uark** driver was written by Jonathan Gray ⟨*jsg@openbsd.org*⟩.

## CAVEATS

Setting hardware flow control is not currently supported. It is not yet known how to ask the hardware to send a break.

Arkmicro Technologies do not reply to requests of documentation for their products.