Which USB device is which /dev/ttySx?

[Erik Christiansen]

On Fri, Oct 06, 2006 at 08:40:00PM +1000, Peter Garrett wrote:
> On Fri, 6 Oct 2006 11:18:29 +1000
> erik at dd.nec.com.au (Erik Christiansen) wrote:
> 
> > Does anyone know of a way to resolve USB device ID to linux device, so
> > that one can be sure that it's listening at all?
> 
> You cab try opening a couple of terminals and running
> 
> tail -f /var/log/messages           ( before you plug the usb device in)
> 
>  and
> 
> dmesg | tail                             (immediately after plugging it in)

Aaaah! That gives:

Oct  9 11:53:48 dvalin kernel: [4299169.127000] usb 1-2: FTDI 8U232AM
Compatible converter now attached to ttyUSB0

$ find /dev -name '*ttyUSB0*'
/dev/ttyUSB0

$ ll /dev/ttyUSB0
crw-rw----  1 root dialout 188, 0 2006-10-09 11:53 /dev/ttyUSB0

$ grep dialout /etc/group
dialout:x:20:erik,cupsy

Using /dev/ttyUSB0, my converter still fails, but a borrowed one works!
Admittedly, I'm trying 115200 (and 38400) baud, which seems to be a bit
much for some generic converters. Maybe it'll manage 9600 ... Nope.

Rats, looks like I'll have to take the laptop under my arm, and go
shopping for a decent converter. :-(

Many thanks for your help.

Erik