基于wince和arm的多串口扩展及485通信设计①-计算机系统应用.pdfVIP

计 算 机 系 统 应 用 2015 年 第 24 卷 第 5 期 基于WinCE 和ARM 的多串口扩展及485 通信设计① 贾继鹏, 张永坚, 胡延凯 ( 山东建筑大学 信息与电气工程学院, 济南 250101) 摘 要: 随着我国《可再生能源建筑应用工程评价标准》的实施, 对已建可再生能源建筑应用示范项目运行数据 的需求越来越迫切, 为了解决可再生能源建筑应用示范项目数据采集系统中对多串口及 485 总线通信的需求, 采 用 ARM9 嵌入式微控制器 S3C2440 和具备 UART/SPI 接口的 4 通道芯片 VK3234 进行串口的扩展, 并利用 MAX3485E 芯片, 实现了现场检测设备与数据采集器之间的 485 通信. 本文对 S3C2440 和 VK3234 、MAX3485E 芯片之间的接口和软硬件的设计进行了具体的阐述, 在实验室的实际运行测试中表明该系统稳定可靠, 并运用 到可再生能源示范项目数据监测系统中. 关键词: S3C3440; VK3234; MAX3485E; 串口扩展; 可再生能源; 数据采集 Extended Multiple Serial Port and 485 Communication Based on WinCE and ARM JIA Ji-Peng, ZHANG Yong-Jian, HU Yan-Kai (Shandong Jianzhu University, School of information Electrical Engineering, Jinan 250101, China) Abstract: Along with the book evaluating standards for renewable energy building’s application projects implements in our country, we are in urgent need of the operational datas about the renewable energy building’s application demonstration projects. The data acquisition system of the renewable energy building’s application demonstration projects has one demand of multiple serial ports and a 485 bus communication. This paper uses ARM9 S3C2440 embedded microcontroller and VK3234 with four channel UART/SPI interface to extend serial. What’s more, it achieves the 485 communication between the field detection device and data acquisition device with MAX3485. This paper states the interface and software and hardware between S3C2440, VK3234 and MAX3485E specifically. The practical running test in the laboratory shows that the system is stable and reliable, and it has been applied in the data monitoring system of the renewable energy demonstration projects. Key words: S3C2440; VK3234; MAX3485E; serial port expansion; renewable energy sour