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UCHCOM(4)		     Kernel Interfaces Manual		       UCHCOM(4)

NAME
     uchcom -- WinChipHead CH9102/CH343/CH341/CH340 USB to serial UART driver

SYNOPSIS
     device usb
     device ucom
     device uchcom

     In rc.conf(5):
     kld_list="uchcom"

     In sysctl.conf(5):
     hw.usb.uchcom.debug=1

DESCRIPTION
     The  uchcom  driver provides support for the WinChipHead USB to serial UART
     adapters.	If the appropriate hardware is	detected,  the	driver	will  be
     loaded  automatically  by devmatch(8).  To load the driver manually, add it
     to the kld_list in rc.conf(5), or use kldload(8) at runtime.  The device is
     accessed through the ucom(4) driver, which makes it behave like a tty(4).

     Call out through this interface with applications like cu(1) or tip(1).

HARDWARE
     The uchcom driver supports the following USB to serial UART controllers:

     *	 WinChipHead CH9102 (max 6Mbps)
     *	 WinChipHead CH343 (max 6Mbps)
     *	 WinChipHead CH341 (max 2Mbps)
     *	 WinChipHead CH340 (max 2Mbps)

SYSCTL VARIABLES
     These  settings  can  be  entered	in  the   loader(8)   prompt,	set   in
     loader.conf(5), sysctl.conf(5), or changed at runtime with sysctl(8):

     hw.usb.uchcom.debug  Enable debugging messages, default `0'

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
     cu(1), tty(4), ucom(4), usb(4)

HISTORY
     The uchcom driver appeared in FreeBSD 8.0 from NetBSD 5.0.

FreeBSD ports 15.quarterly	  June 25, 2025 		       UCHCOM(4)

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<https://man.freebsd.org/cgi/man.cgi?query=uchcom&sektion=4&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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