[SOLVED] Remote Zoom and Focus Control of Digital Video Camera

I have got a 27 x dsp color video camera (ccd) which I want to injstall on the robotic arm. It is 12 DC operated and has some connections for zoom and focus inputs / control alongwith the power connector. It also has manual zoom and focus control at the back panel. I want to implement controls of camera zoom and focus with the joystick I am already using for motor contros ( I will manage extra buttons on the joystick). The problem is that I donot know how to use these pins labeled zoom and focus in the connector, what is the input and how it is going to be used? ....... Need help? The sticker at the camera reads out as under:

Red -- Power+
Black -- Power -
Brown -- COM
Yellow -- Focus
Purple -- Zoom

How can I use these Yellow and Purple leads??? I have not experimented as it might damage camera. Please provided some tested solution.

Here is pic of the camera

Solved.......