According to the manual version 1.01 the output pin is “reserved”, which probably means did not have a function upon production. Can you measure anything on that pin on both presence - no presence?
It may need also a pull-/ up/down resistor to work if the function is enabled.
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Output pin is constantly on GND, state doesn’t change. so it seems that it’s really “reserved” - thanks, i missed that “reserved” description. Close examination of all fw’s also show that basically there are only two - in one i get status icon (that greer-red circle) then “normal” and “micro” settings, while with other one status circle is missing, i can only set micro and macro range. I don’t know why there are 4-5 of fw’s shown in app, but only in two additional “LD2411” description appears.
Ok, at least i know it’s possibilities. Since my modules are a few years old, ordered more or less “blindly” perhaps they are “first edition” and lack all features…
Luckily i have some LD2410 lying around, and a couple of LD2420 on the way… wonderfull tiny things they are…