Orion 52419 USB-to-Serial Adapter Use this Adapter to control your GoTo telescope mount with a USB-port equipped laptop running popular astronomy software programs such as Starry Night, NexRemote, EQMOD, and more Adapter kit includes software disc and cable to create a virtual serial (COM) port for laptops that do not already feature a built-in serial port Also allows use of firmware update software for hand-controllers and motor drives on laptops without built-in serial ports For computerized GoTo telescope mounts that do not feature a built-in ST-4 port , you can use this Adapter in conjunction with software such as PHD Guiding to provide pulse guiding