Papsi, earlier by beisammen.de? Willkommen bei Remotecentral!
(For the rest of you, "beamer" is a German "pseudo-Anglicism" for video projector.)
Sony unfortunately does not equip every model with a protocol description document. But the commands do not differ that much between the different models, AFAIK.
Here is a similar document, that should serve your purpose.
BTW, I have a VPL-HW50, successfully controlled with my own Java code. Let me know if you are interested.