Radio Shack 26-123 Usb-to-serial Adapter Hooking RCA Connections To The Radio Shack Speaker Selector?

Hooking RCA connections to the Radio Shack speaker selector? - radio shack 26-123 usb-to-serial adapter

I have a switch from Radio Shack Speaker, I met my speakers in the ceiling, now I want a radio, satellite, has an RCA connection, get in touch. I am a real novice at this, but I do not think it would be difficult.