CAN-based Upper Computer System Design For Loom

China is a country with great textile production and consumption. As an important part of textile production, the loom control system plays key role in improving production efficiency and product quality and reducing labor intensity. As the existence of the problem of domestic looms’technical level, stability, reliability, and experience of human-computer interaction, a design based on distributed and multi-processor architecture is proposed by the research group. Each part of the system is controlled by different CPU and communication among them is achieved by CAN bus. This paper will detail the design of the upper computer system. As a part of loom control system, the upper computer system is responsible for the user to configure various operating parameters of loom. In the meanwhile, it deals with the data which is accessed accurately during the loom working time.The upper computer system with ARM processor and embedded Linux system has a10-inch true color LCD screen and touch screen. It has advantages of clear and bright displaying, friendly interface, easy operation and superior performance. The design conforms to the developing trend of intelligent.The hardware platform is designed around AT91SAM9261which is ARM9with a32-bit processor. It contains CAN-Bus interface, LCD display interface, USB interface and others. After this, embedded Linux OS and root file system is transported. We use Qt framework to achieve loom parameter setting, data saving and access, pattern editing, data statistics, CAN frame sending and receiving in the user space.In addition, wxPython is used to design the software of flower editing on computer. The software designed can efficiently complete editing Dobby flower. The pattern file saving format is also defined in the paper.Finally, each module of loom control system is connected to the same CAN network. With the help of USB-CAN analyzer we can access the data transmitting on the bus and debug the entire system. After the test by our cooperation loom factory, the control system has advanced performance and can work stably. After all, the system can meet our design requirements.