I found this discussion of the HL-340:
http://tiagovaz.wordpress.com/2008/01/04/using-a-hl-340-usb-serial-adapter-against-2623-linux-kernel/

Does it help?

Paul

On 1/3/09, William Brown <mahi...@earthlink.net> wrote:
> William Brown wrote:
>
>  I get this error message using a USB to serial RS232 adapter (HL-340) on
>  my laptop.  Any ideas what is happeing?  group set to tty, permissions
>  are 777.
>
>  Cannot detect DS9097 (passive) interface on /dev/ttyUSB0
>
>
>  
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