I'v searching GSM interface like some ppl here. I use Nokia 5110 and try to use AT command to it but it's not work and I'm not sure what other ppl success to interface it or not. what I'v got most is from http://members.tripod.com/dpeddi/techinfo.html
this website show it's packets format of Nokia signal
but it's not enough info . I want to know the clear explanation of it's protocol and I wonder why Nokia not support it . although I'v emailed to ask them. what I can read from Nokia in Hex form is ... 1Eh,0Ch,00h,7Fh,00h,02h,05h,01h,1Bh,70h.. etc. which I really dont know the meaning and I think it's not an ASCII code. hope anyone can give me the clearly info for me can send signal from 8051 to dial it and control it.
Thanks