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UCOM(4)                      Device Drivers Manual                     UCOM(4)

NAME
     ucom - USB tty support

SYNOPSIS
     ucom* at u3g?
     ucom* at uark?
     ucom* at ubsa?
     ucom* at uchcom?
     ucom* at uftdi?
     ucom* at ugensa?
     ucom* at uhmodem?
     ucom* at uipaq?
     ucom* at ukyopon?
     ucom* at umcs? portno ?
     ucom* at umct?
     ucom* at umodem?
     ucom* at uplcom?
     ucom* at uslsa?
     ucom* at uvisor? portno ?
     ucom* at uvscom?
     ucom* at uxrcom?

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 behaviour like a
     tty(4).  This means that normal programs such as tip(1) or pppd(8) can be
     used to access the device.

     The portno locator can be used to decide which port to use for device
     that have multiple external ports.

     Note that while ucom supports the (undocumented) pulse-per-second API
     normally used on conventional serial ports, USB serial devices typically
     have a varying latency around 1 ms due to the USB frame structure.

     The ttyXX devices are traditional dial-in devices; the dtyXX devices are
     used for dial-out.  (See tty(4).)

FILES
     /dev/dtyU?

     /dev/ttyU?

SEE ALSO
     tty(4), u3g(4), uark(4), ubsa(4), uchcom(4), uftdi(4), ugensa(4),
     uhmodem(4), uipaq(4), ukyopon(4), umcs(4), umct(4), umodem(4), uplcom(4),
     usb(4), uslsa(4), uvisor(4), uvscom(4), uxrcom(4)

HISTORY
     The ucom driver appeared in NetBSD 1.5.

NetBSD 10.99                    April 12, 2020                    NetBSD 10.99