Despite the ONVIF is getting widespread day by day among devices, sometime it is not suitable to be used on a system.
It could be a limitation on the camera that it is going to be used, as well as on the NVR/VMS.
It could be that the user doesn't trust on the ONVIF capabilities, and he prefers to run all the commands over a traditional RS485 serial line, using the well-known Pelco-D protocol.
It is probably a little bit anachronistic in a network/IP driven world; the Ulisse Netcam gives anyhow such possibility as well: you can switch off all the ONVIF capabilities, bridge the network connection from the base to the housing to have a direct access to the camera, connect a RS485 controller to the telemetry inputs (which is usually the camera itself).
- the CPU is totally OFF working in RS485 mode;
- the Ulisse won't have any L2/L3 capability, and also the web interface will be unavailable;
- all the PT-related configurations (motion parameters, movement limits, ...) must be done the traditional way: a composite display connected to the Video Out, a RS485 controller connected to the serial port, OSD enabled on the screen;
- mixed modes are not allowed: you can not have the CPU enabled (e.g. to access the web pages) and control the unit over RS485; conflicts on the serial line will arise, messing up the controller.
To enable the RS485 telemetry mode, follow the step-by-step procedure here enclosed. Nothing more to add... just use at your own risk!