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

# ucycom(4freebsd)

device driver for Cypress CY7C63743 and CY7C64013 USB to RS232 bridges

## NAME

**ucycom** – device driver for Cypress CY7C63743 and CY7C64013 USB to RS232 bridges

## SYNOPSIS

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

**device usb** **device ucom** **device ucycom**

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

```
ucycom_load="YES"
```

## DESCRIPTION

The **ucycom** driver provides support for the Cypress CY7C63743 and CY7C64013 bridge chips. These chips were designed to provide a low-cost transition path to USB for existing RS232 devices, and have fairly limited capabilities.

The **ucycom** driver behaves like a [tty(4)](/tty/4.md).

## HARDWARE

The **ucycom** driver currently supports the following devices which incorporate Cypress USB to RS232 bridge chips:

- DeLorme Earthmate USB GPS receiver

## 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 **ucycom** driver first appeared in FreeBSD 5.3.

## AUTHORS

The **ucycom** driver and this manual page were written by Dag-Erling Smørgrav ⟨*des@FreeBSD.org*⟩.