The USB-COM232-4A is a four-port asynchronous serial communication adapter designed for use with any computer system equipped with a USB port. Multiple peripherals such as POS, barcode scanners, scales, date-entry terminals, data acquisition modules, and automation equipment can now be recognized and used on a single USB port. Simply install the included software and connect the unit to your USB port. It instantly provides four RS-232. It is now easier than ever to add serial ports and serial devices to any application along with easy plug-and-play and hot-swapping features.