---
name: "ucom"
section: "4"
platform: "linux"
package: "freebsd-manpages"
version: "6.0-5"
release: "Debian 4.0 (Etch)"
platforms: ["linux", "freebsd", "openbsd"]
url: "https://carta.tech/man/ucom"
---

# ucom(4)

USB tty support

## NAME

**ucom** – USB tty support

## SYNOPSIS

**device ucom**

## DESCRIPTION

The **ucom** driver attaches to USB modems, serial ports, and other devices that need to look like a tty. The **ucom** driver shows a behavior like a [tty(4)](/man/tty/4.md). This means that normal programs such as [tip(1)](/man/tip/1.md) or [pppd(8)](/man/pppd/8.md) can be used to access the device.

The *portno* locater can be used to decide which port to use for devices that have multiple external ports.

## FILES

- */dev/cuaU?*

  ## SEE ALSO

[tty(4)](/man/tty/4.md), [uftdi(4)](/man/uftdi/4.md), [umct(4)](/man/umct/4.md), [umodem(4)](/man/umodem/4.md), [uplcom(4)](/man/uplcom/4.md), [usb(4)](/man/usb/4.md), [uvisor(4)](/man/uvisor/4.md), [uvscom(4)](/man/uvscom/4.md)

## HISTORY

The **ucom** driver was adopted from NetBSD in March of 2002. This manual page was adopted from NetBSD by Tom Rhodes ⟨trhodes@FreeBSD.org⟩ in April 2002.