Differenciate Multiple USB Ports

Bob Chiodini rchiodin at bellsouth.net
Mon Aug 8 12:07:51 UTC 2005


On Mon, 2005-08-08 at 17:03 +0530, kanhu wrote:
> Hi all,
> 
> Can anybody help me on how to differenciate multiple usb ports on a 
> system running fedora core 3.
> Is there any commands available to know this.
> ls -all /dev/ttyUSB shows me
> 
> ttyUSB0   ttyUSB10  ttyUSB12  ttyUSB14  ttyUSB2   ttyUSB4   ttyUSB6   
> ttyUSB8
> ttyUSB1   ttyUSB11  ttyUSB13  ttyUSB15  ttyUSB3   ttyUSB5   ttyUSB7   
> ttyUSB9
> 
> Currently I am using only one USB port for my mouse.
> I have pluged in the Usb-To-Serial converter  on one of my USB PORT, And 
> try to configure it by minicom -s
> it shows me
> 
> minicom: cannot open /dev/ttyUSB0: No such device or address
> 
> I have tried it for USB0,USB1,USB2.......
> 
> Any Idea to proceed is welcome
> 
> 
> With Thanks & Regards
>       Kanhu
> 

Does /var/log/messages help to define the device?  I have a 4 port
keyspan USB to RS-232 converter and I get the following when I plug in
the device:

Aug  8 08:02:33 tweedy kernel: usb 1-4.4: new full speed USB device using ehci_hcd and address 7
Aug  8 08:02:33 tweedy kernel: keyspan 1-4.4:1.0: Keyspan - (without firmware) converter detected
Aug  8 08:02:33 tweedy kernel: usb 1-4.4: USB disconnect, address 7
Aug  8 08:02:33 tweedy kernel: keyspan 1-4.4:1.0: device disconnected
Aug  8 08:02:34 tweedy kernel: usb 1-4.4: new full speed USB device using ehci_hcd and address 8
Aug  8 08:02:34 tweedy kernel: usb 1-4.4: configuration #1 chosen from 4 choices
Aug  8 08:02:34 tweedy kernel: keyspan 1-4.4:1.0: Keyspan 4 port adapter converter detected
Aug  8 08:02:34 tweedy kernel: usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB0
Aug  8 08:02:34 tweedy kernel: usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB1
Aug  8 08:02:34 tweedy kernel: usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB2
Aug  8 08:02:34 tweedy kernel: usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB3
Aug  8 08:02:34 tweedy usb.agent[23799]: Keeping default configuration with /sys//devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.4

In my case port 1 of the device is ttyUSB0 followed by the others.

dmesg, likewise gives the following:

usb 1-4.4: new full speed USB device using ehci_hcd and address 8
usb 1-4.4: configuration #1 chosen from 4 choices
keyspan 1-4.4:1.0: Keyspan 4 port adapter converter detected
usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB0
usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB1
usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB2
usb 1-4.4: Keyspan 4 port adapter converter now attached to ttyUSB3

Bob...





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