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sim300c echoing at commands

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bilgekaan

bilgekaan

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Hello,
I have sim300dz module on sim300c eVB 2.01 board. When I poer up board, I receive call ready message.İf I try to send At commands , board is just echoing At command I sent .
Not responding my commands. I Am usşng only RX and TX signals.Not using control signals( RTS ,DTe ,,etc) . What I undersatnd from blink led is my module is found the gsm network.
I am waiting for your suggestion.
Regards
Bilge
 

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