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You could try to use some udev rules as described in https://askubuntu.com/questions/49910/how-to-distinguish-between-identical-usb-to-serial-adapters

But the easiest and quickest way is probably to use the symlinks in /dev/serial/by-id/, for example /dev/serial/by-id/usb-SparkFun_SparkFun_Pro_Micro-if00.

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