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The description of pins : - 5v (Power interface Power the module) connect to DC5v - GND - VDD TTL UART interface The TTL UART serial interface, you can connect the MCU like 51MCU or ARM or MSP430 directly. The pin of VDD is used to match voltage of the TTL. - SIM_TXD - SIM_RXD - GND if this pin is unused, keep open - RST RST the module, if this pin is unused, keep open