We (I) used to show exactly this in training classes!
Your projector is a PJlink capable model. TCP for PJlink is on Port 4352
You can do a google search for a PJ link protocol spec download, but to get started try:
Power-on (lamp-on) instruction
Hex 25 31 50 4f 57 52 20 31 0d
Character % 1 P O W R (SP) 1 (CR)
Power-off (standby) instruction
Hex. 25 31 50 4f 57 52 20 30 0d
Character % 1 P O W R (SP) 0 (CR)
It is not possible to subscribe to a Parameter Preset. Parameter Presets are an event, not a state.
Here is one way you could get feedback:
Add a Source Selector into the Audio Configuration. Add the Source Selector to your Parameter Preset Group. Set a different source for each Parameter Preset. Now subscribe to the Source Selector.