loop back at command on sim900

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kazem67sh

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hi dear friend
I'm working with sim900 (sim 900 doesn't answer my at command just reply every thing that I send, back) and when I turning the sim900 off send "NORMAL POWER DOWN" on hyper terminal:bang::bang::bang::bang: (cry cry cry)
help me please
 
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Do you terminate the commands you send with /r/n ? (Append CR-LF ?)
Is autobauding enabled? Then you will have to send "AT" to the module first, in order to sync the baudrate of the module with your computer. After that you can set a fixed baudrate with AT+IPR=<baud>
 

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