Interfacing SIM300 with ATMEGA16

[kendrepv07]

Hi friends...
I want to interface SIM300 with ATMEGA16. I can send commands using Hyper terminal of my pc and SIM300 is working properly. Also when i connect my micro controller board to pc through serial cable, I am able to send the data serially to hyper terminal. But problem is that when I connect microcontroller with SIM300 it doesn't give any response.
Also on both SIM300 board and µC board I have RS232 DB9 female connector.
So please help.....
Thanks.

 

[ckshivaram]

search the forum for solution.... this is answered many times.....

connect same cable to modem and test on hyperterminal.... see it works else change tx and rx pins..............