interfacing problem

i need to get a c code for interfacing the microcontroller to a GSM Modem only to send sms, i have read all the AT COMMANDS of the sms and the data sheet shows me how to use the modem through the hyper terminal of the windows but it doesn't show how to interface with a micro ?
can any one describe what are the steps of this ? and i need the hardware interfacing scheme to do this ?
if any one have a usefull link please co-operate .
thank you

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  • You interface it in the same way when using a microcontroller as you do when interfacing with a PC. If the GSM modem is using RS232 levels, you need a MAX232 or similar to convert from TTL levels.

    If you have a document describing how to connect the GSM modem to a PC, why (and how) do you expect us to be able to supply information about how to connect it to a microcontroller, when we don't know which modem (we don't have your documents) and which processor...

    Select a microcontroller with a at least one serial port and google for examples of using that serial port together with a MAX232 chip. That should be enough to connect almost any external equipment. If you need more handshake signals - just take more pins from the uC and use in a similar way.

  • See: http://www.keil.com/forum/docs/thread9113.asp

    And use the 'Search' facility to find the very many (and recent) threads that have already covered all this at great length!

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