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HI I have HSDPA 7.2 mbps GSM Modem I wnated to send sms using of C# device is ok I have tested using hyper terminal only problem is when I type AT+CMGS="+615545544455" in hyper terminal and I type message and CTRL Z to end it gives error ERROR 305 "Invalid text format" I been through lots of examples but still could not solve this issue. Is there a way I can find if device supports text mode or PDU mode? I am trying text mode which is easy.
Posted 19-Jun-14 22:00pm

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Solution 1

The AT command to get in Text Mode is AT+CMGF=1
And PDU encoding is AT+CMGF=0

But in Text Mode, encoding of the text when sending a SMS i important to.
Standard GSM Encoding is AT+CSCS="GSM"

Hope it can help! :-)

And to be on the safe side, start with at AT&F
SIA1982 20-Jun-14 7:21am
Kim Togo 27-Jun-14 7:23am
Great! :-)

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