Hi, I tried using the hokuyo getID program to identify a hokuyo. The program works correct and returns the serial-number by using it from a normal shell. However udev doesn't create a symlink when the hokuyo is plugged in. Oddly, running a "udevadm test" on the ttyACM device the rule is executed and the symlink is created. here is my udev rule (karmic system): SUBSYSTEM=="usb", KERNEL=="ttyACM*",PROGRAM="/getID /dev/ttyACM%n q", ATTRS{manufacturer}=="Hokuyo Data Flex for USB", ATTRS{product]=="URG-Series USB Driver", SYMLINK+="hokuyo_%c", MODE="0666" Has anyone seen this behavior before? - Jochen Kläß