When i connected Sim800a gsm module to serial port and when i press reset button it receives message cpin ready...sms ready etc.but when i try to communicate with AT commands its not working?i checked for all the baud rates..for 9600 baud rate when i press reset button i get message but if i send AT command i did not get any reply from module..what is the problem dont know?please anyone help me to getout from that problem.?
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