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.
系统的输出是使用TL16C550实现异步通信串口并使之与计算机RS232串口连接以观察识别结果。
TL16C550 chip is used to extend an UART in order to communicate with PC RS232 serial port.
系统的输出是使用TL16C550实现异步通信串口并使之与计算机RS232串口连接以观察识别结果。
TL16C550 chip is used to extend an UART in order to communicate with PC RS232 serial port.
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