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interfacing gsm modem with microcontroller problem

Hi!!

I am doing a project based on gsm.Here i need to interface microcontroller at89c52 with gsm modem.I am using a sim300 modem.Main objective is to send sms using gsm by providing AT commands from microcontroller.sim300 responds properly when AT commands are given from hyperterminal, but it doesnt respond when i send the AT commands serially from microcontroller.I am not able to figure out where i have gone wrong. I have connected uc and gsm using MAX232. can someone please help me out to interface microcontroller and gsm?