The USB to DB25 Serial RS232 Adapter Cable has been used to connect it all! This adapter cable has helped customers connect to older serial RS232 controllers, GPS devices, scanners, fax modems, security systems and more to the USB port of a newer laptop or desktop. Since this adapter uses no IRQs, multiple adapters may be used simultaneously when you need many serial devices attached to your PC. This adapter cable enables high speed serial data transfer up to 115.2 K between the USB and the traditional RS232 serial port. Perfect for connecting a serial device to a laptop or PC's USB port Use multiple adapters simultaneously to connect multiple serial devices Compatible with USB 1.1, USB 2.0 and USB 3.0 ports