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AT Commands using TCP/IP Connection with GPRS Modem

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Hello, I'm trying to communicate with a GPRS Modem by using AT Commands, I tried this manually by sending commands through Telnet and Hercules Software so modem is responding correctly.

 

I want to do the same using a Labview VI, so when I'm runnning the VI it seems that commands are send correctly but I dont get any answer from the modem. I  don´t know if I'm using \n\r characters ok.

 

I would appreciate any help


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