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AT+CMGS returns ERROR

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4 2027
终归单人心
终归单人心 2021-01-01 19:49

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
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  • 梦毁少年i
    梦毁少年i (楼主)
    2021-01-01 20:14

    Sometimes the issue is the text mode you are in. Enter AT+CMGF? and you should receive +CMGF: 1. If instead you receive +CMGF: 0, enter AT+CMGF=1. This changes the message format from PDU mode to Text mode. I'm not sure what either of those mean exactly, but this fixed my issue.

    SIM 800 AT command manual

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