mjhjmtu

I have an old OpenBSD (5.0 GENERIC#43 i386) at a production site. Now I'm trying to connect a zebra-printer to it with a usb-to-serial cable without success. The issue is getting the device to exist and configured.

How do I do that? Or is it already there?

Some output:

foobar# dmesg
...
uplcom0 at uhub1 port 1 "Prolific Technology Inc. USB-Serial Controller D" rev 1.10/3.00 addr 2
ucom0 at uplcom0
...

foobar# usbdevs -d 
addr 1: EHCI root hub, Intel
 uhub0
addr 1: UHCI root hub, Intel
 uhub1
 addr 2: USB-Serial Controller D, Prolific Technology Inc.
 uplcom0
addr 1: UHCI root hub, Intel
 uhub2
 addr 2: Lexmark T630, Lexmark International
 ulpt0
 addr 3: USB Optical Mouse, Logitech
 uhidev0
addr 1: UHCI root hub, Intel
 uhub3

foobar# usbdevs -df /dev/usb1
addr 1: UHCI root hub, Intel
 uhub1
 addr 2: USB-Serial Controller D, Prolific Technology Inc.
 uplcom0

foobar# ls /dev/ucom0 /dev/uplcom0
ls: /dev/ucom0: No such file or directory
ls: /dev/uplcom0: No such file or directory

Note that the ulpt0-device is connected to a regular paper-printer and that is working properly, it is the uplcom0-device that I can't get to.

According to man ucom there seems to be some thing on /dev/ttyU?. I have also tried sending data to these with no success. On /dev/ttyU0 I interrupt after waiting some minutes and get the message:

ksh: cannot create /dev/ttyU0: Interrupted system call

For the others /dev/ttyU[1-3] I get messages similar to this:

ksh: cannot create /dev/ttyU1: Device not configured

Read man 4 ucom. You are probably looking for /dev/cuaU0 which is the "calling unit" (see man 4 tty) for the ttyU0 terminal.

Try # cu -s 115200 -l /dev/cuaU0 to see if you can chat with the printer. Change the baud rate from 115200 to something else, if needed be (the default is 9600).

Also, remember that only root and users on the dialer group have permission to read/write to /dev/cuaU0, so you might want to add your user to the dialer group: # usermod -G dialer foo.