If you do not have PTZ wires running out to the camera or the wires are already being used for another purpose and the cost of running a new set of wires is prohibitive, then you can use the existing coax cable carrying the HD-TVI
This product provides an RS422 PTZ Data Link on any coaxial cable or UTP twisted pair wire video path. Use it to add (PTZ) Pan Tilt Zoom control to any existing video camera without running additional wires or the expense of vertical interval control equipment.
This RS422 data link can be used with any CCTV video camera to add PTZ control or send any date in either direction on any coaxial cable or twisted pair wires.
