table of contents
UCOM(4) | Device Drivers Manual | UCOM(4) |
NAME¶
ucom
—
USB tty support
SYNOPSIS¶
To compile this driver into the kernel, place the following line in your kernel configuration file:device ucom
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
ucom_load="YES"
DESCRIPTION¶
Theucom
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). This means that normal programs such as
tip(1) or ppp(8) can be used to access the
device.
Pulse Per Second (PPS) Timing Interface¶
Theucom
driver can capture PPS timing information as
defined in RFC 2783. The API, accessed via ioctl(2), is
available on the tty device. To use the PPS capture feature with
ntpd(8), symlink the tty device to
/dev/pps0.
The hw.usb.ucom.pps_mode sysctl configures the PPS capture mode. It can be set in loader.conf(5) or sysctl.conf(5). The following capture modes are available:
- 0
- Capture disabled (default).
- 1
- Capture pulses on the CTS line.
- 2
- Capture pulses on the DCD line.
FILES¶
- /dev/cuaU?
- /dev/ttyU?
SEE ALSO¶
tty(4), uark(4), uchcom(4), uftdi(4), umcs(4), umct(4), umodem(4), umoscom(4), uplcom(4), usb(4), uslcom(4), uvisor(4), uvscom(4)HISTORY¶
Theucom
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.
BUGS¶
Prior to FreeBSD 6.0ucom
created /dev/ucom? rather than the uniform device
names created today. Old scripts must be adjusted accordingly.
March 11, 2015 | Linux 4.9.0-9-amd64 |