Arduino _ISIS _Labview

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Hello
I'm working at controling stepper motors with Labview and Arduino using "VISA" and Proteus simulation using the "virtual serial port driver"

As the first step, I made a simple code for control 3 servo motors instead stepper motors and it worked

#include <Servo.h>

//Initialization
Servo servoA,servoB,servoC;
byte servoA_angle=0,servoB_angle=0,servoC_angle=0;

void setup() {
  servoA.attach(11,1000,2000);
  servoB.attach(10,1000,2000);
  servoC.attach(9,1000,2000);
  Serial.begin(9600);
}

void loop() {
  // Send Request to LabVIEW
  Serial.write('r');
  while(Serial.available()<3);
  servoA.write(Serial.read());
  servoB.write(Serial.read());
  servoC.write(Serial.read());
  Serial.flush();
  delay(100);
}



The problem is when I change the code arduino for controling steppers. I hadn't changed the labview's code . It didn't work. I don't know where is the error.

#include <Stepper.h>

Stepper stepper1(200,2,3, 4, 5);  // je pose que le moteur fait 200 pas par tour
Stepper stepper2(200,6, 7, 8, 9);
Stepper stepper3(200,10, 11,12,13); 

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode( 2, OUTPUT );
pinMode( 3, OUTPUT );
pinMode( 4, OUTPUT );
pinMode( 5, OUTPUT );
pinMode( 6, OUTPUT );
pinMode( 7, OUTPUT );
pinMode( 8, OUTPUT );
pinMode( 9, OUTPUT );
pinMode( 10, OUTPUT );
pinMode( 11, OUTPUT );
pinMode( 12, OUTPUT );
pinMode( 13, OUTPUT );

stepper1.setSpeed(30);
stepper2.setSpeed(30);
stepper3.setSpeed(30);
}

void loop() {
  
  
Serial.write('r');
  while(Serial.available()<3);
  
  stepper1.step(Serial.read());
  stepper2.step(Serial.read());
  stepper3.step(Serial.read());
  Serial.flush();
  delay(100);
}

I will be so grateful if someone can help me .
Thank you so much.

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