I took over an account with a theater that was using Control4. Client didn't like it so I'm doing an MX890 with a MRF350

The problem is they were using a CAT5 from the motor on the DALITE screen to the rack and spliced it to a 12V trigger that was then plugged into the Control4 controller. I'm used to just have the screen trigger off the projector but cant because they didn't run a wire between the two. Is there anything I can get or do that will relay to the 12v module and get the screen to go up and down using the MX890 and MRF350