Pan & Tilt control

Hi all,
I have just managed to get a Canon VC-C1 camera for my robot. The problem is that I have to write a driver to control de Pan and Tilt in
Linux. The camera has a RS232 port to control de Pan&Tilt, but the problem is that I have no idea of the protocol or messages it uses. Somebody can help me, please?
thank you
p.d.: sorry if you receive this message replicated
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