I’ve implemented a PJLink binding for openHAB 2.
It allows to control devices which implement the standard, in particular digital projectors. The binding currently supports PJLink class 1 including authentication.
A lot of well known projector manufacturers are involved in the standard, e.g. Sony, Panasonic, NEC, and many more. Even if it is not officially mentioned, also Acer projectors support the standard (at least some, like mine).
Feel free to try it with your projector and let me know if you run into issues!