Lpc2000

> I have MCB2140 board from KEIL and I want to connect MC35i GSM modem
> with the same on COM1 of lpc2148.
> 
> The port given on board is not fully connected as there are only two
> wires connected Tx and Rx. I want to make a data call to another PC
> and the at command is ATD<NUMBER>
> 
> Problem is if i m transmitting this at command or say any data from
> board to PC using serial comm, I can receive that on PC.
> But when i am sending same command to GSM modem from my board I am not
> getting any responce resulting there is no ring to the other modem
> which is connected to PC.
> 
> I want to do it with two wire only so need your help..

You should confirm your device (MC35i GSM modem) does not require hardware
handshaking.  A quick test would be to only wire Tx/Rx/Gnd to PC.  Be sure
to read the documentation of your modem, that is the key.