Sabrent USB-2920 USB 2.0 to Serial DB9 (RS232) Adapter (FTDI Chipset) by Sabrent. $16.99. This Sabrent adapter is the easiest way to add a serial port to your computer. Many PDAs, digital cameras, GPS units, barcode scanners, and other equipment require a serial connection and many newer computers don&#x27;t have serial ports. This cable can help eliminate the hassle of connecting to legacy serial ports by updating your devices to the USB standard. This fully plug and p...