I used MCU to start the modem..Now i am facing another problem..When i connect it through hyperterminal it works fine on all flow controls.i.e None,Hardware, and Xon/Xoff... But when i connect it with some software like bulk SMS software...it is not detecting the modem...I am using all pins except RI dedicated to serial port in the module..
Sometimes it is changing the baud rate automatically from 8N1 to 7E1...
Check the coding thoroughly for the baud rate mentioned anywhere, if it changes then change the baud rate in hyper terminal once the code stops appearing in hyper terminal, after disconnecting.