(NOT USB to VGA cable) RS232 USB to DB9 female serial port cable allows you to connects a PC without serial port to a serial device because it adds a 9 pin port to laptop or desktop via USB port. 10 feet USB 2.0 to RS232 DB9 serial cable (male to female) is long enough for your devices to reach to a place needed (standard pinout: pin 2- RXD, Pin 3- TXD, Pin 5 - GND).
eBay