@Mircea_Russu , i know im pest now, but how your config file looks like?i still need switch module?
@Damian_Trejtowicz take a look https://github.com/executivul/Smoothieware-K40-config/blob/master/config.txt
@Mircea_Russu now its not clear enoug for me, why there is two pins? 2.4 and ttl 2.6, i should connect this 2.6 to anything?
I use the 2 pin setup. If using the diagram I’ve put earlier just use the pwm line with no “!” After prin number, no need to use the ttl pin.
You can ue my config but replace the tll and pwm lines with “laser_module_pwm_pin 2.4”. That’s all.
i give up.
i done all like you show me @Mircea_Russu and all what i get i laser constantly on an no power controll.
maybe i should try this second diagram with two pins
Using my config from github? Please paste only the laser_… lines. Did you connect like my schematic? Any other changes to the lps wiring?
all done like you showed. and when i turn laser on, i my laser is shotting
:)))) looks like i get to work now, in my case should be 2.4 not 2.4! like in your config
Please read my posts again. I’ve said at least 3-4 times “no !” 
Glad you made it!
I dont know why but i missed this.Now all works fine without level shifter.just now i need to learn how to use laserweb.how to cut and engrave in one program.
I can only do this in visicut,thru inkscape
so im not dumb as i look ,i figured out this without any help.
+Peter van der Walt ,if you still need any laser service i have new company,we offer laser cut,bending and all services http://www.mtlengineering.co.uk/
We started with new laser cutting departament and sales of lasers