ok that means we have General power control from laser with S command.
next step would be to get ON/OFF control via Output (M10/M11)
if i look to this Manual:
https://optlasersgrav.com/index.php?controller=attachment&id_attachment=56there are two Enable Inputs listed on the Interface.
on page 29 is descibed
How to Check Enable Option in PLH3D-CNC Adapter
can you pls do this check?
then you have to set enable Options like described on page 30
mode 2 (mode description page27) should be the right one.
then you Need to connect port1 pin8 to enable input1 (terminal 3), and the you should
have ON/OFF control via M10P1/M11P1