The HItachi VK-S434R is a compact chassis-type camera. It offers a 18x optical zoom a removable IR Cut Filter. It is controlled using RS-232C. Zoom, Iris, Focus, IR Cut Filter & many more functions can be controlled. For more detailed information go to the Download page and see the pdf.
I have been designing the PTZ unit with Alibre Cad software. This link will open a PDF of what I have designed so far. The PDF will allow you to rotate and see the individual parts of the PTZ.