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Modem and PDA interface circuit

Modem and PC computer interface in fact it is a modem in the MCU W77E58 with PC-interface circuit. W77E58 support TTL level, while the PC serial communication port RS 232C support the EIA-level, so in order to synchronize them in reality ie., to have serial communication between them ,a level-shifting circuitry must be designed.

Level converter circuit is a modem and computer command center side of the interface circuit, it is also wireless data transmission system hardware circuit (command center side) of a component. The working of the circuit is as follows: The output of the modem demodulation digital signal is processed by the microcontroller, then to the W77E58 serial communication port 2, through the level conversion chip MAX232, then to PC machine RS 232C port (DB9) and PC's internal UART, and the signal is finally passed to the CPU, in monitoring the platform is displayed.

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Modem and PDA interface circuit