i interfaced labview with gsm using visa serial if i write AT as input i should get OK as output but i am getting AT OK AT OK AT OK repeatedly eat i shld do

[haribabu]

i interfaced labview with gsm using visa serial    if i write AT as input i should get  OK  as output  but i am getting  AT OK AT OK AT OK  repeatedly   eat i shld do

[JÞB]

Use the run button and not the run continuously button?

Its very difficult to guess without seeing the code that is causing your confusion.