The USB to RS232 converter allows you to connect a non-USB RS232 DB9 device to your USB bus. This Black Box USB to RS232 converter allows you to connect a non-USB RS232 DB9 device to your USB bus. You can use this Intelligent USB-to-serial converter in point-of-sale settings for mobile computing in the field or any place you require flexible I/O expansion. Hook it up to your bar-code scanners touch screens security cameras PDAs and other peripherals.