介绍了串口编程技术，RS485总线驱动模式和RS485串口驱动程序。 然后在此基础上设计和实现了SDM300远程控制模块和异步信道的通信模块。
Findally, we implement SDM300 remote control module and Async communication module on the basis of introducing technology of serial programming , RS485 bus driving mode and RS485 serial driver.
通过单片机内部的串行口编程完成了单片机和PC机之间的通信。
Through programming the com port of microprocessor realized the communication with PC.
语音识别部分由软件编程实现，通过串行口编程进行通信，控制单片机，它成功实现控制发光二极管和语音播放的目的。
The voice recognition part is realized by software programming, the microcontroller is controlled by communicating with serial port, it can successfully realize to control the LED and voice broadcast.
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