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The SIM800A is a GSM GPRS circuit (SIM900A update) integrates a pulse source and buffer ic, designed to be compact but still retains the essential elements of the Sim Module design such as Logic signal level conversion circuit using Mosfet, RS232 communication IC MAX232, high current pulse power circuit, standard sim slot and LED indicators, the circuit also comes with a GSM Antenna.
The TXD and RXD pins are directly connected to the microcontroller pin. TXD is connected to the microcontroller's TX. The RXD pin is connected to the microcontroller's RX pin.