How to identify multiple USB-serial adapters under Ubuntu 10.1

Question

I am reading data from multiple identical USB-serial adapters under Ubuntu 10.1.

On occasion, their /dev/tty path changes (eg if other USB devices are connected on s

Answer 1

Look with $ udevadm info -n /dev/ttyUSB0 -a which port your USB device is plugged in. The variable KERNELS of one of the parent devices should be something like KERNELS=="1-1.2:1.0".

Create a udev rule:

SUBSYSTEM=="tty", KERNELS=="1-1.2:1.0", SYMLINK+="ttyUSB42"
SUBSYSTEM=="tty", KERNELS=="1-1.3:1.0", SYMLINK+="usb-serial"

and trigger udev

$ udevadm trigger