I wanted to verify what I need to do to connect our tally lights up. What my CCU requires is a simple contact closure so I was going to use a simple set of 3 relays. By the docs I have I will need to use an external power supply, ground it to pin 5 of the 9 pin sub-D. Connect positive to each of the relays and connect the other coil legs to pins 1,6,2 for 3 cameras. I am assuming it does not matter if I use a 5V or 12V power supply since the docs say the MAX is 12V. I plan on building this today so will check back here before I plug it all in. Someone sent me a file containing all the info I need but I can not read the file now for some reason and can not tell the program that made it because the file extension is missing.