SIM 900 got stuck in SEND sms command

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rajbabu

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HI,

I connected SIM900 modem to PC and sending commands through Hyper terminal.
I am able to call. but i try for send sms it got stuck after entering Message. and i wanna us it again so i have to power off it and again power on it.

i am trying like this
AT enter response is OK
at+cmgs="90xxxxxxx" enter response is >
Now i enter message
cntrl+z but no response even i try another. it is not able to take any other command till i do not power off it.

Please suggest some solution.
 

Please try to any other hyper terminal.. but u are using firmware at+cmgs="90xxxxxxxx"
then type content and 0x1A(ctrl-Z) that sms is sending.. some hyper terminal data was sending by hex value.. that time the sms was sending..
 

This one might seem a dumb answer but AT+CMGS need Mobile no. with country code (i suppose) followed by 10-digit number, i.e. +9190xxxxxxxx.
The code you showed does not follow this.
Or else you need to use the number type specifier in the command.
I have sent SMS through SIM 900 using hyperterminal, using the proper format and it worked fine for me.
 


We also had similar type of problem initially during the starting phase of our vehicle tracking system project.
We found out later that the ASCII code 0x01A is actually not transmitted to the GSM module, due to the weird nature of the hyper terminal program we were using. Our problem was solved by changing the hyper terminal program.
 

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