Design Of Industrial Equipment Ethernet Accessing Based On ARM

The convenience and efficiency of internet have gained acceptance with the development of IT. The further development of Industrial Ethernet and requirement of RMON (Remote monitoring) leads the industrial instruments to the direction of networking.Most of backward instruments use RS-232 (Recommended Standard-232) standard as the only communicating method in china. Now the CAN (Controller Area Network) bus, a proven technology, has been supported by more and more equipments, as well as the USB (Universal Serial Bus). Nowadays the technology of net and IT develops rapidly, in order to change and share information more expediently, and monitor in better quality, it is very necessary to upgrade the current port to support sending and receiving data through internet.A design, which use LPC2292 ARM7 as CPU and employμC/OS-Ⅱas RTOS, is proposed. It is based on the study on RS-232 protocol, CAN protocol USB protocol, and embedded TCP/IP protocol (Transmission Control Protocol/Internet Protocol). This design can support duplex RS-232 port, duplex CAN port and single USB port which support sending and receiving data through internet at the same time. In this designing, the rate of RS-232 and CAN is adjustable, the USB port can support the widely used 12Mbps instrument and it also has the self adaptability to the internet rate of 10 or100Mbps.In addition, this design adopt ADS 1.2 as software development tool.The industrial instruments can easily access to Ethernet using this design through converting the protocol from RS-232, CAN, and USB to IP. It also provides a flexible and reliable platform for RMOT. The experiments suggest that this design can implement all destined functions.