i am doing a project with gsm modem interfaced with ARM. and i my interface of gsm and muc is not working. i am using simcom gsm.and LPC2129/2368 microcontroller i am getting the GSM data through UART1 interrupt. please give me the connection details i.e. RS232 between the two and the UART1 settings
So why did you say that you are able to send messages?!
"TX (modem)to RX (microcontroller)"
Read the modem datasheet again very carefully - pay particular attention to the directions of all signals.
Assume nothing - read carefully.
Also try searching this forum for "DTE" and "DCE"...