Which USB device is which /dev/ttySx?

[Erik Christiansen]

Plugged in a USB to serial dongle. lsusb shows:

Bus 004 Device 001: ID 0000:0000  
Bus 003 Device 001: ID 0000:0000  
Bus 002 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 002 Device 001: ID 0000:0000  
Bus 001 Device 001: ID 0000:0000

Ah, now let's try using it:

$ minicom

After setting 115200 8N1, to suit other end, I sent characters to the
PC. There was no go, with "Serial Device" set to /dev/ttyS0, /dev/ttyS1,
or /dev/ttyS2. (Hardware & Software Flow Control are both set to "No",
to suit the other end.)

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?

Incidentally, I haven't installed any drivers, not least due to having
none. Is the success of the lsusb identification any indication that
further communication with the peripheral is possible?

Erik