基于CAN总线的中控主机的系统设计

A Center Control Computer System Based on CAN Bus

智能中控主机作为多媒体会议室和多媒体展厅等现代化办公场所运转的控制核心,其重要性不言而喻,目前市面上主要采用的是基于RS485总线的传统组网模式,导致系统的实时性较差、容错率较低、功能欠完善,同时成本高昂;针对这种情况,在不允许改动被控设备的工作方式的条件下,提出一种基于CAN总线网络,以嵌入式系统作为主控设备,以各功能驱动模块作为子设备的中控系统;通过CAN总线控制器的优先级仲裁机制,以及制定的带错误反馈的数据包通信协议,实现了对各种被控设备的实时精准控制;该中控主机系统硬件电路简单、功能模块方便扩展、成本低廉并且高效稳定;通过实验测试,所设计的智能中控主机性能良好,达到了规定的行业标准,具有广泛的应用前景。

As the control core of the modern office space, such as multimedia conference room and multimedia exhibition hall, the smart center control computer is very important, it is almost based on RS485 bus in current market. This will result in the worse real--time performance, the lower error--tolerant rate, the more deficient function and the higher price. In according with this situation, a smart center control computer system is intro- duced, which is based on CAN Bus network, with the embedded system as the master device, and the variant function modules as slave devices. Through the priority arbitration mechanism of CAN Bus controller, and the data packet communication protocol which contains error feedback, the real --time and accurate control to various controlled equipments is realized. So, the hardware circuit of the control system is simple, the function module is easy to expand and the cost is lower. According to the test, the design of the smart center control computer is good enough to meet the requirements of industry standards, and has a broad applications.