Sending float to arduino uno using VISA

Question

Hi guys,
Basically i am trying to send a float to arduino uno.
I use for that a string .I send at first its length  then i send the numbers.
For the arduino side ,here is the code.I can see that the board Rx/tx leds blinks when i start the Vi.Unfortunately, the led which  doesn"t blink as it should be.
Here is a quick look at my arduino code.
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
pinMode(13,OUTPUT);
// Serial.flush();
// prints title with ending line break
int i=0;
int j=0;
int longu=0;
char data='F';
String data2="";
float val=0;
int posVir=0;
void loop()
if (i==0)
delay(10);
data=Serial.read();
longu=(int)data;
while (j<longu+1)
{data=Serial.read();
data2=data2+data;
delay(10);
j=j+1;
val=data2.toFloat();
i=1;
delay(50);
if (val==22.5)
digitalWrite(13,HIGH);
delay(1000);
digitalWrite(13,LOW);
delay(1000);
if (val==315)
digitalWrite(13,HIGH);
delay(4000);
digitalWrite(13,LOW);
delay(4000);
val=0;
Attachments:
Sending data toarduino V2.vi ‏18 KB

Answer 1

Basically a rehash of http://forums.ni.com/t5/LabVIEW/Synchronisation-with-arduino-and-Labview-using-visa/m-p/3110008