The port splitter attaches to the 9-pin "AO/CFW/SCOPE" port on an ST-7/8/9/10/2000 camera and gives you three 9-pin ports for attaching a variety of accessories such as a CFW8A, AO-7 and Relay Adapter at the same time. An additional RJ11 relay output port is also provided and four red LEDs indicate relay activity.  The port splitter should be used to replace the temporary ribbon type Dual Relay Cable for more robust connections.