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AT-Command

       I connected my mobile to the laptop to COM1 serial by the cable came with mobile, then I used the Hyper Terminal. Every thing is okay I can write command and Read the Response (like read SMS) by its configurations using AT-Command.   BUT..........    When I built my project on labview the result was wrong, when I write to VISA "COM1"    (AT) as example  ,  the response should be (OK)  but it read (AT) again so the Read from VISA read just what I wrote in VISA write "it's wrong". I thought about ECHO but it's already works fine on Hyper Terminal, so the problem is not ECHO.
When I Built the project on labview I start with VISA configuration then VISA write then Delay time  then VISA read, Finally VISA Close.     Am I wrong???? 
Can any one help me???? please
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It's actaully a 3rd duplicate post.
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