AT+CMGS returns ERROR

serial-port sms gsm avr at-command
Mohammad Farahi picture Mohammad Farahi · Feb 3, 2014 · Viewed 35k times · Source

I am using SIM900 GSM module connect to my AVR Microcontroller. I tested it with FT232 to see transmitting data. First Micro sends AT it will response OK

AT OK
AT+CMGF=1 OK
AT+CMGS="+9893XXXXXX" returns ERROR and doesn't show ">"

Could anybody advise me what to do?

Answer

yuriygorskyy picture yuriygorskyy · Feb 16, 2014

Command AT+CSCS? will answer You what type of sms-encoding is used. Properly answer is "GSM", and if not, You should set it by command AT+CSCS="GSM".

And remember about "Ctrl+Z" (not "Enter") as a finish of sms text, please.

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