---
name: "ubsa"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["linux", "freebsd", "openbsd"]
url: "https://new.carta.tech/ubsa"
---

# ubsa(4)

Belkin USB serial adapter

## NAME

**ubsa** – Belkin USB serial adapter

## SYNOPSIS

**ubsa\*  at uhub?** **ucom\*  at ubsa?**

## DESCRIPTION

The **ubsa** driver provides support for the USB-to-RS232 Bridge chip used by a variety of serial adapters from Belkin and other vendors.

Some 3G (UMTS/GPRS/GSM) [cardbus(4)](/cardbus/4.md) devices use a Belkin serial adapter and an [ohci(4)](/ohci/4.md) controller to provide a common AT interface.

The device is accessed through the [ucom(4)](/ucom/4.md) driver which makes it behave like a [tty(4)](/tty/4.md).

## HARDWARE

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

- Axesstel MV100H

  - Belkin F5U103

  - Belkin F5U120

  - e-Tek Labs Kwik232

  - GoHubs GoCOM232

  - Peracom single port serial adapter

  - Qualcomm, Inc. ZTE AC8700

  - Qualcomm, Inc. ZTE CDMA Technologies MSM

  ## SEE ALSO

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

## HISTORY

The **ubsa** driver first appeared in FreeBSD 5.0 and was ported to OpenBSD 3.3.