actually you can get a quite precise manual of IP/RS-232 control of those projectors from JVC web site. This is good news. Bad news are that it won't help you, I suggest. The reason why - they done IP control protocol weird. I tried to implement it in one of my crestron projects, but after couple of hours decided to use RS-232, and let me tell you why. IP control looks like two parts - first off all you should establish a connection to the socket:

Crestron: Hi, who's there?
JVC: I'm JVC Projector
Crestron: Let me send you a command?
JVC: Well. Do it.

After that control system should send a command within 5 seconds, because if there was no activity - projector closes a socket and you should start over.

So it means that if you need to send ANY command - you should start with initializing procedure, even if you just asking status response. And there is no way to eliminate this (as far as I know).

Good luck