USB to RS232 adapter cable connects from the USB-A port of a computer to a device with a female DB9 port; Bus-powered Serial to USB adapter connects to devices for configuration or programmingMale to male serial to USB cable provides a convenient solution for communicating with equipment that require a DB9 connector; Use a DB9 mini gender changer (sold separately) if the connector of the RS232 to USB adapter will not mate with the equipment portSimple installation of the USB Serial adapter using the drivers available for download from Cable Matters; Connect a null modem adapter (sold separately) to directly connect two computers with serial cablesWindows & Mac compatible USB to Serial cable for Windows 2000/XP/Vista/7/8/10 and MacOS 10.6 and above; The 9 pin to USB adapter may require additional proprietary software some equipment modelsRS-232 compatible db9 to USB adapter is required for many types of equipment including a CNC Machine GPS telescope Set-top box network switch sewing Machine and more