Guide Port Interface with Pass-thru
This device plugs into the parallel port of a PC or laptop computer and converts the D4, D5, D6, and D7 data lines into signals that can be used by the guide port (sometimes referred to as a CCD port) of many types of telescopes. This guide port interface offers many advantages over using a relay box: it is small, requires no power source, and you don't have to worry about getting it wired up. An RJ-12 cable is all that is needed to go from the interface adapter to your guide port.
This adapter uses optocouplers to provide electrical isolation between your computer and your telescope electronics. This helps avoid possible ground loop and noise pickup problems that can be difficult to debug.
This adapter passes the parallel port signals through to another DB-25 female connector, so that the D0, D1, D2, and D3 data lines can be used to control webcams or video devices.
More information can be found by clicking here to view the User Manual. (Requires Adobe Acrobat Reader)