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.
文章对串行口通信技术以及通信程序的开发、多线程编程技术进行了详细分析。
The serial ports of communication technology, communication program development, and multithread programming technology has been analyzed in detail.
该方案将自由口编程完全采用智能仪表的特定通信协议，既简化网络结构，又节约布线。
The free-port program with special communication protocol of intelligent instrument is used in the scheme, not only network structure is simplified but also wire laying is saved.
详细介绍了在自由口模式下S7- 200PLC与计算机实现串行通信的方法，重点介绍了通信协议及其实现方法，并给出了编程实例。
How to implement serial communication between S7-200 PLC and computer based on free port mode was described in detail in the paper.
详细介绍了在自由口模式下S7- 200PLC与计算机实现串行通信的方法，重点介绍了通信协议及其实现方法，并给出了编程实例。
How to implement serial communication between S7-200 PLC and computer based on free port mode was described in detail in the paper.
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