No special software, you only need to use your hyperterminal comes with Windows to control your device, but the RS232 port is not built for this purposes(to control by a computer, if you can control by a IR remote, why you want to control using computer), the RS232 is built for the purposes if...
First choice: Component(3 nos. of Coax) Second choice: S-Video (2 nos. of Coax) Third choice: Composite Video (1 nos. of Coax) But I suggest you lay both component and s-video cable, because if your receiver or switcher do not support up scan, then if you are using a player without...