Honeywell HD6 PTZ camera mount control options

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Apologies if this is in the wrong category.

i recently acquired a Honeywell HD6 pressurised dome PTZ security camera. All the PCBs etc are connected and appear to have power (based on the indicator LEDs).

It runs from a 20VAC supply. All the external wiring is also present however no plugs/adaptors at (what would be) the wall side. I’ve scoured the Internet for over 2 weeks, have downloaded HD6 manuals, tried to educate myself on the different protocols (PELCO D, etc) but am still struggling to grasp a way to control the mount.

I’ve attached a picture of the PCB that the external wiring connects too. The top portion is obviously for TX, RX etc.

I just want to be able to control the mount (not overly concerned with the camera at this stage) through Arduino with maybe MAX232 IC and joystick, external PC joystick, through a PC itself.

I just don’t know what else I require or how to send/receive data from the mount.

Can provide more details/photos if necessary