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I am trying to interface gsm sim900D with windows xp hyperterminal..problem is when i send AT command and enter..there is no reponse like "ok"..what should i do..is my gsm module faulty..when i turn pkey on it displays
RDY
+CFUN:1
+CPIN:ready
CALL READY
and when some one call on my sim it...
hello,
I am having trouble testing GSM 900D with arduino mega2560...GSM is not responding..i am not sure whether is program is incorrect or my connections are wrong..program is simple testing by sending AT command to GSM and waiting for response "ok" on serial monitor..here is program..
void...
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