Thanks very much for the instructions, as you pointed, motor rotates at each 5V strike, in addition, 5V connected to EN + free the motor so that’s the good news I believe.

This is my first contact with stepper motors so please be patient  When striking 5V, sometimes the motor's rotation is ‘uneven’, i.e. it’s jumping one step but sometimes it feels like it’s jumping a few steps and sometimes one step in opposite direction. I guess, this is due to not precise pulsing by using simple push button? I’ve connected n/o push button between 5V source and PUL+ btw..

Also, with e-stop off:

I can measure 5V between 5V & GND and between EN & GND terminals. LED called 'output status' is illuminated.

With e-stop on however:

5V between 5V & EN and 5V & GND terminals. 'Output status' LED is not illuminated.

What do you guys think?