Labview visa getting slow when connected to arduino

visa in labview when connected to arduino prog gets slow
i have checked it passes the required codde but action is slow
and most important every time to get the o/p i need to stop the prog then start again.
i tried doing a new prog with only one string constant and visa in singlw while loop thinking this was due to lenghty progs but still things are not working as i want i.e. fast n without stopping the prog. i have attached my files n images of required portion of block diag
i have used a string of lenght 10 char n i my program and just one visa write.
Solved!
Go to Solution.

Ranjeet_Singh my requirement is to send 10 character srting from visa write to arduino. When i change the controller index and click on my led's which i have designed to transmit my code( only if true) using case selctor the code must reach arduino. It reaches but there is a delay of 2 to 3seconds everytime i send. and next time when i change th index and click the led to send the code it is not passed. when i run the program again it is passed. I have added all my code in a single while loop which runs continously.
I have made a code in arduino for my hardware. when i send codes from arduino my hardware runs successflly.
n yes only command response operation is involved.
regarding 2011 i wont be able to i guess.but i am copy pasting my prog in labview 7.1. except visa everythig is pasted i guess.
i have attached images of my block diagram for further reference.
my harware is: two 8bit DAC, DDS an i.c. which accepts code and generates sinwave, digital potentiometer which accepts code and takes a value between 0 to 10kohm and 12 relays take thier control signal from this code.
crossrulz m using port 18 of my p.c and connecting usb to arduino mega 2560.
my harware is: two 8bit DAC, DDS an i.c. which accepts code and generates sinwave, digital potentiometer which accepts code and takes a value between 0 to 10kohm and 12 relays take thier control signal from this code.
i judge labview goes slow because when i dont connect arduino n run the prog the hex code indicator going to visa displays code exactly at the instant when i press led for transmission of code.
as per ur sugesstion i checked arduino board i found thr transmission and recieve led's are on continously.and as per my labview prog my transmission should actually start only when i click the led.may due to continues transmissiion its getting slow.
but what can i do then?

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