---
name: "uchcom"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "12.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/uchcom/4freebsd"
---

# uchcom(4freebsd)

WinChipHead CH341/CH340 serial adapter driver

## NAME

**uchcom** – WinChipHead CH341/CH340 serial adapter driver

## SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

**device usb** **device ucom** **device uchcom**

Alternatively, to load the driver as a module at boot time, place the following line in [loader.conf(5)](/loader.conf/5.md):

```
uchcom_load="YES"
```

## DESCRIPTION

The **uchcom** driver provides support for the WinChipHead CH341/CH340 USB-to-RS-232 Bridge chip.

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 **uchcom** driver supports the following adapters:

- HL USB-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 **uchcom** driver first appeared in NetBSD. The first FreeBSD release to include it was FreeBSD 8.0.

## BUGS

Actually, this chip seems unable to drive other than 8 data bits and 1 stop bit line.