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

# umoscom(4)

USB support for serial adapters based on chips made by MOSCHIP

## NAME

**umoscom** – USB support for serial adapters based on chips made by MOSCHIP

## SYNOPSIS

**device** **usb** **device** **ucom** **device** **umoscom**

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

## DESCRIPTION

The **umoscom** driver provides support for various serial adapters based on chips from MOSCHIP.

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

## 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 **umoscom** driver appeared in OpenBSD and was ported to FreeBSD.