interfacing intel 8051with a gm862 gprs modem and a ADC0808

i need to convert a analog signal using adc0808 and then send the data to the serial out of the 8051 in order to transmit it to the gprs modem. i tink i hav to use ATcommands. Can anyone guide me on how to do this? I don't kno much about the uC so any info u may have please share

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