HEY , U NEED TO CONNECT RX OF MICROCONTROLLER TO THE 2ND PIN OF DB9 OF MODEM AND TX TO THE 3RD PIN OF MODEM.
i.e if u r using
MICRO CONTROLLER -> max232 -> DB9 connector -> "RS232 Cable" -> modem
then u must have cross connection at "quoted" rs 232 cable i.e. 2 and 3 pins must be swapped between 2 ends of RS232 cable ,
check it out it will work, I suffered a lot due to same problem but it was d solution, do it and move ahead coz programming part is real challenge w8ng for u
if u r done with it
plz help me in progrm .....