Why would anyone do any reverse engineering on this?
Either it's open or it isn't. And if it isn't, their lawyers will shut anyone down as an unauthorized third party,making any effort a complete waste of time.
those modules are gateways to other systems. i will not talk lutron to lutron central but only listen to lutron's communication and execute commands on other systems modules based on what I listen from lutron's 485.
this is only the first idea. maybe a gateway from Lutron's RS232 to proprietary RS485 would be a way to do it too.