About SBIG ST-7RC
The SBIG ST-7RC Adapter Plug is supplied with all "ST" series cameras. It plugs into the 9 pin "AO/CFW/SCOPE" port on an ST-7/8/9/10/2000 camera and accepts an RJ-11 to RJ-11 Tracking Cable that connects the camera to your telescope drive's autoguider ("CCD") port. This adapter plug is not required when using a CFW8A.