Есть в системе такой UPS:
Bus 004 Device 002: ID 0d9f:0002 Powercom Co., Ltd Black Knight PRO / WOW Uninterruptible Power Supply (Cypress HID->COM RS232)# ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Apr 19 21:22 /dev/ttyUSB0
# cat /etc/udev/rules.d/52-nut-usbups.rules
SUBSYSTEM=="usb", ATTR{idVendor}=="0d9f", ATTR{idProduct}=="0002", MODE="664", GROUP="nut"