Thank you! That was very helpful. After doing some digging, I went ahead and bought a gently used IPCP 505, looks like that and possibly some other tools will do exactly what I need.

One question maybe you can help with: the connectors on the back aren't normal serial connectors such as I'm used to dealing with. Are there prefabricated cables, or should I be looking for ends and wiring my own? I have a few of the ends that came with different extron devices I bought, but for control most appear to have normal serial ports like you'd find on a PC.

Again, I apologize, I am very new to this.