Device 51.0 is definitely not the same as device 51, you need 51.0.

Apparently there is more than one code set for these. I didn't see anything describing how you configure the projector for another code set. I assume that once you have done that you can use the multiple code sets to independently control multiple projectors in the same room. Some models work with eight code sets, others with just the first two code sets. The eight code sets can be created in MakeHex using device 51.0, 51.17, 51.34, 51.51, 51.68, 51.85, 51.102 and 51.119

It also said the three power discrete commands only work in the first code set. I would think that wrecks a lot of the benefit of having multiple code sets.