Hi, Initially i made the circuit on a general purpose PCB for interfacing mobile and PC to have exercise on AT commands and to know how it works.then i connected my Nokia 3315 and PC-COm with this circuit,my hyperterminal is not responding to any of the AT Commands.
I am unable to find whether my mobile modem is responding or not.
I kept my hyper terminal settings as;
115200 baud
no parity
one stop bits
flow control is none
8 data bits

And i am not much clear about that setting of DTR and clearing of RTS;
how to do that?

I used the ckt which has been shown here;

http://www.forosdeelectronica.com/about2.html

is the ckt is right?

what changes i should make to get a response from hyperterminal for AT.

Please help me out...