@pauliedazzle said:
NEC PA653UL
Most modern laser projectors doesn't come with a physical shutter anymore, but dim or shut down their light source, or simply blank the picture. The bigger ones offer to decide between those options.
While the light source/laser off is comparable with the physical shutter, the picture mute is not, as it still gives the minimum light of the projector, often resulting in a 'glimmer' where a true black is needed on stage. There often is a menu setting to switch between those modes.
A quick look into the documentation reviled following (it really was just quick, I might be partly wrong):
1. There are separate remote buttons for those functions on the remote.
2. the PJlink documentation has contradicting information.
While the 'supporting command list' says only the mute function is supported, but not the shutter (NEC calls it lens mute), there is a note at the documents head, saying later revisions (13.1, probably meaning the Firmware) do support it.
Wrapping all up, I guess there are two different commands available, but if they work depends on the firmware revision your projectors are on. Unfortunately, the pjlink documentation on their webside doesn't provide detailed information of any of those commands.
unfortunately