i am doing project on motor control with gsm mobile,so i want to know about various method of interfacing of microcontroller with gsm modem with circuit diagram so ,pls send me above information to make my project more succses.
Really? Are you actually doing anything? You don't seem to have progressed much in nearly 2 months: http://www.keil.com/forum/19321/
in the original thread there was a reply: "The world doesn't have just "one modem". And not just "one 8051". So there can't be just one connection diagram. And not one single AT command-set document."
and, regardless you persist with an ambigous request interfacing of microcontroller with gsm modem with circuit diagram
just off the bat, I can think of 6 possible "circuit diagrams" depending on the type of modem
Erik
And some "modems" would be impractical to use with an 8051...