Okay, It looks like my plan of placing a joystick at the back of the DVR in line with the existing cable will not work. Maybe you know of some way to make it work based on your experience.
Anyway, I dissected the cables from the DVR to joystick, then on to the camera as follows:
OUT OF THE DVR (4 wires in 2 Cables)
Cable 1 - Power
1) Red Wire
2) Black Wire
Cable 2 - Data ?
3) Yellow Wire
4) Black Wire
INTO THE JOYSTICK FROM DVR (4 wires in 2 Cables) - same as out of DVR
OUT OF THE JOYSTICK INTO CAMERA (6 wires)
1) Yellow
2) White
3) Black
4) Black w/White Stripe
5) Red
6) Red w/White Stripe
As originally noted, all the cameras are up on the roof in hard to get to places, so cannot run another new cable to the joystick/cameras. I had hoped there was some way to tap the cable at the back of the DVR and add a joystick in line. It does not seem possible since there are only 4 wires from DVR to joystick, but need 6 wires to the camera.
Do you concur that this will not work? Or do you have any other ideas that might use a joystick at the DVR end using the existing 4 wires to the joystick/camera to control the OSD?
I should have opened the cable up first since I assumed there were 6 wires out of the DVR (even though in hindsight that does not make much sense). Thanks for your time on this.