Yes, but you can't tie up the ride phone...I realize that this isn't PKI where the ride ops are CONSTANTLY on the phone, but believe it or not, CP ride ops do use the phone from time to time... :)
The problem, of course, is the rotation. That's usually handled with a commutator ring. Because every conductor between the cabin and the ride would need its own commutator ring (power, phone) it is doubtful that there is an extra pair in there for another data source.
On the other hand, X-10 keeps sending me email about a wireless color video camera; I suppose one of those connected to the cabin electrical would be able to send a signal back to the elevator assembly without too much trouble, then the webcam encoder could use that signal.....
--Dave Althoff, Jr.
*** This post was edited by RideMan on 3/3/00. ***