Cables Unlimited R-USB-2925 Factory Re-Certified USB Cable to Dual DB9 Serial Adapter Adapters USB Factory Re-Certified USB Cable to Dual DB9 Serial Adapter . Our USB to 2-Port DB9 Serial Adapter provides the perfect solution for using all of your legacy serial devices with your new USB only computer. With plug-and-play compatibility, installation a breeze. This adapter is ideal for connecting PDAs, digital cameras, GPS units, barcode scanners and many other serial devices to a USB port. 1 Year