maybe someone familiar with ptz cameras and dvr can help me. I have a 8 channel dvr with cameras installed. None of my cameras are ptz. but I wanted to use the ptz control on my dvr to control my garage door opener. is there any way to use the rs232 port on the dvr to make a relay switch to contol my remote garage door opener switch. i have an app on my phone to view cameras and control the ptz. since Im not using the ptz control for the cameras I thought I could build a switch to control the garage door opener. Any suggestions. I am not familiar with how to set up a ptz camera