Nope, this is the first time I really looked at the thing! I guess back in the day I hooked it up to test it, but probably got busy with other things.
I also have the dust sensor on bus 1.2 working fine. When I opened it up I had Empty 1.1, Dust 1.2, VOC and O3 on 2.1 and 2.2.
But ok, I’ll jiggle the handle.