Problem - Read from Closed Loop Stepper Motor while Rotating

[Paul_KD7HB]

@merulo

  for (int i=0; i <= 400; i++){ // This loop will perform one revolution CCW
    digitalWrite(Pul, HIGH);
    delayMicroseconds(1000);
    
    digitalWrite(Pul, LOW);
    delayMicroseconds(1000);
    
    Serial.print(i);      //print and track step compared to measured rotation
    Serial.print(" : ");
    Serial.println(pos);
    
  }

Did you program this, including the delays, based on the specifications of the stepper controller, or did you just guess at the delay? You likely need NO delay to get the stepper to turn.
Paul