AVS Special Member
Join Date: Jun 2005
Location: Northern, VA - Washington, DC
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In my world (Crestron) I would hook the 12v up to the I/O port of my control system, and detect when the projector is powered on, then send a relay contact closure to the remote control to lower the screen. When 12v is removed, I would raise the screen.
12v on a projector is 'ON' when the projector is powered on, and 'OFF' when the projector powers off. That way there is a definitive on/off state to the projector.
I'm not sure, but you can check with the manufacturer of the screen to see if they offer any additional controls for the screen. I know that my screen (Draper) has to use an external low-voltage controller to allow up/down control from a low voltage system.
Worth saying - why use the 12v trigger at all? Why not just program your universal remote control to raise/lower the screen when you turn the projector power on/off. This really would be much simpler than trying to figure out what the projector is doing and tying things to it. With my system, when I press my 'Cable TV' button, the screen is told to drop, the projector lift lowers (for 12 seconds) and the projector powers on. The receiver power on, the cable box is powered on, and everything switches to the proper input. It all happens because of what the remote & control system tells it to do, not from anything else. So, a good remote would just take care of all of this for you easily.
AV Integrated - Theater, whole house audio, and technology installation in the Washington DC metro area.