gsm modem interfacing

i m unable interface gsm modem kit (st2133) using microcontroller AT89S51 to just send an sms . is it possible to interface with using only 3 pins of uc i.e txd,rxd ,gnd of uc.please send me a sample...
gsm modem interfacing

i m unable interface gsm modem kit (st2133) using microcontroller AT89S51 to just send an sms . is it possible to interface with using only 3 pins of uc i.e txd,rxd ,gnd of uc.please send me a sample...
GSM Modem Interfacing Problem

hi frieds, I am doing interfacing gsm modem with my com port through vc++ application. we have three majore function 1) check signal strength 2) read sms using at+cmgl="ALL" 3) send sms using...
GSM Modem Interfacing Problem

hi frieds, I am doing interfacing gsm modem with my com port through vc++ application. we have three majore function 1) check signal strength 2) read sms using at+cmgl="ALL" 3) send sms using...
Gsm modem interfacing with lpc2148

When I connect gsm with lpc 2148 I am not receiving any response from gsm. Program is correct I have seen it's output on hyperterminal.what can be the problem please help me.