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

# ubser(4)

USB support for BWCT console serial adapters

## NAME

**ubser** – USB support for BWCT console serial adapters

## SYNOPSIS

**device** **usb** **device** **ucom** **device** **ubser**

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

## HARDWARE

The **ubser** driver provides support for the BWCT console management serial adapters.

## 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 **ubser** driver appeared in FreeBSD 5.2.