AVR-Chat

----Original Message----
From: AVR-Chat@yahoogroups.com
[mailto:AVR-Chat@yahoogroups.com] On Behalf Of
enkitec@gmail.com Sent: 24 February 2010 12:35 To:
AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Re: USB to
serial db9 cable 

> On 24-Feb-10 02:06, Donald H wrote:
> > I have not found any USB-2-serial dongle that will keep
> > the COMx number the same across USB ports. 
> > 
> > don
> > 
> > 
> 
>      I would like to introduce my FTDI USB-2-serial
> dongle that doesn't 
> change the COMx number when connected on different USB
> port. 
> 
>      Don't ask me why, I don't know.
> 
>      Mark Jordan
> 

If the device presents a unique ID code to Windows when it gets
enumerated, then it should stay the same across different USB ports. I
believe it is a feature of the FTDI chip that it has a unique serial
number programmed into it. Other devices just present a VID/PID but no
unique identifier.

-- 
Tim Mitchell