SUBSYSTEMS=="usb", KERNEL=="ttyUSB?", ATTRS{serial}=="Quad RS232-HS", ATTRS{bInterfaceNumber}=="00", SYMLINK+="Quad1"
SUBSYSTEMS=="usb", KERNEL=="ttyUSB?", ATTRS{serial}=="Quad RS232-HS", ATTRS{bInterfaceNumber}=="01", SYMLINK+="Quad2"
SUBSYSTEMS=="usb", KERNEL=="ttyUSB?", ATTRS{serial}=="Quad RS232-HS", ATTRS{bInterfaceNumber}=="02", SYMLINK+="Quad3"
SUBSYSTEMS=="usb", KERNEL=="ttyUSB?", ATTRS{serial}=="Quad RS232-HS", ATTRS{bInterfaceNumber}=="03", SYMLINK+="Quad4"