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.
检测系统的串口通信采用异步IO机制，并运用多线程技术，提高了系统的实时性；
The serial communication was developed by using asynchronous IO mechanism and multithread technology, which improve the real-time performance of the system.
通过异步扩展芯片TL16C554实现了扩展4路串口，并完成4路信号的实时接收和发送，实现了集中器与4个子机的远距离通信；
In this paper, four serial ports were expanded by TL16C554 and remote communication between repeaters and four slaves was realized.
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