Hi Randy
If you're using the QM2000.Net box why don't you use the spare pair in the Cat 5 cable as i've done. You just need a couple of splitter boxes so you can couple in your E-Stop button at one end and the plug to complete the circuit at the projector end.
I have a 100mtr roll of Cat 5 that I use and it works absolutely fine. I also have shorter lengths to use in small venues.
Cheers
Jem
Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.”... Douglas Adams 1952 - 2001