USB to RS232 Adapter with PL2303 Chipset, CableCreation 6.6 ft USB 2.0 Male to RS232 Female DB9 Serial Converter Cable for Cashier Register, Modem, Scanner, Digital Cameras, CNC,Black - Walmart.com
Can a serial port be converted to a USB? - Quora
USB to Serial Converter Cable (DB-9M / USB Type-A Male), 3ft - Monoprice.com
Amazon.com: TRENDnet USB to Serial 9-Pin Converter Cable, Connect a RS-232 Serial Device to a USB 2.0 Port, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 21 Inch Cable Length,