From owner-freebsd-usb@FreeBSD.ORG  Sun Mar 18 18:57:57 2012
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Date: Sun, 18 Mar 2012 12:57:55 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Fabio Dive <fabiodive@gmail.com>
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	(wonkity.com [127.0.0.1]); Sun, 18 Mar 2012 12:57:55 -0600 (MDT)
Cc: freebsd-usb@freebsd.org
Subject: Re: USB serial adapter, cu write: Device not configured
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On Sun, 18 Mar 2012, Fabio Dive wrote:

> Hello people!
>
> I write you because I have got a problem with the uplcom driver
> on FreeBSD 9.0, I tried a lot of different things, read all I found,
> manpages, forums, irc, google but still not able to solve my problem.
>
> I need to connect to my remote Alix board,
> the remote console setup is 19200 8N1.
> I am using a short USB Prolific Tec.. serial cable adapter with a
> NULL modem cable, the last one plugged one side to the Alix board,
> the other side to the adapter cable.
>
> Under Linux Debian everything is fine, so the hardware and cables
> should be ok, under Linux I used minicom and cu and tip without problems.
> With FreeBSD and NetBSD, big problems..the result is always
> the same, I can receive but I cannot transmit.
>
> (working as root)
> *cu -t -s 19200 -l /dev/cuaU0
> write: Device not configured
> (I can't transmit but I can receive the output if I reboot the remote
> alix board)

Add the user to the dialer group.  If that doesn't do it, make sure the 
user has write permission to the USB device and /dev/cuaU0.