All Crestron equipment can only be controlled via a Crestron Processor. In real world of course, Crestron communicates with its' equipment via RS485 or IP which is a "closed" communication for the outside world. We have interfaced TSU9400 in an application for local TV controls and lights,music,curtains,sources being controlled via the Crestron system by sending serial strings over IP to the crestron and the crestron decoding it and making them into Crestron signals.
Demetris