HOw to determine correct serial port

[Charles Curley]

On Thu, Mar 29, 2007 at 08:53:32AM -0400, Mark Haney wrote:
> I've got a USB to Serial port adapter and for the life of me I can't 
> find the right port for it.  I want to be able to use the adapter in 
> linux to communicate with some Cisco devices we have so that I don't 
> have to boot to Windows.
> 
> Any ideas?

"ls /dev/tty*" should show one or more devices with "USB" in the name,
e.g. '/dev/ttyUSB0". That should be the device you want. You must have
the serial adapter installed for the device to be there.

You might also look at /var/log/messages immediately after plugging in
the adapter to see what the kernel made of it. Mine shows, e.g.:

Mar 29 07:54:47 dragon kernel: usb 2-2: new full speed USB device using uhci_hcd and address 2
Mar 29 07:54:47 dragon kernel: usb 2-2: configuration #1 chosen from 1 choice
Mar 29 07:54:48 dragon kernel: usbcore: registered new interface driver usbserial
Mar 29 07:54:48 dragon kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
Mar 29 07:54:48 dragon kernel: usbcore: registered new interface driver usbserial_generic
Mar 29 07:54:48 dragon kernel: drivers/usb/serial/usb-serial.c: USB Serial Driver core
Mar 29 07:54:48 dragon kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303
Mar 29 07:54:48 dragon kernel: pl2303 2-2:1.0: pl2303 converter detected
Mar 29 07:54:48 dragon kernel: usb 2-2: pl2303 converter now attached to ttyUSB0
Mar 29 07:54:48 dragon kernel: usbcore: registered new interface driver pl2303
Mar 29 07:54:48 dragon kernel: drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver


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