ARM Embedded Linux And Network Technologies In The Applied Research Vessel Monitoring System

With the development of information and network technology, embedded system has penetrated into all fields, but will also be widely used. This paper studies the design of embedded network monitoring system for ships. Realization of the Internet communications between the client and PLC.Based on the ship ballast water system as an example, embedded network and site work is how to achieve the PLC communications, and reading, all linked into the corresponding PLC internal resources, Socket-based Linux server functions and the number of customers respond to the number of customers browse the newsletter PLC Customer requests and laid on the implementation of a single super-power control orders; Communication between the PLC and information exchange network from the user terminals in order to make the visit to the work site can browse information on the implementation of control orders PLC control; User Configuration gateway support, leaving a user interface configuration; Embedded system configuration, users can set up through Gateway IP, port, subnet mask and customization optimization of the system.By design hardware and software to achieve the above two functions. ARM7 processor hardware design to the development board for embedded control chips, Construction of the smallest ARM-based processor; the software is based on uClinux software development environment. Gateway and the whole process is divided into four discussion process to separate PLC communications, communication network interface, Remote users browse the landing and user configuration file download function. The use of process synchronization process and the implementation of the four inter-process communications and synchronization of data exchange and realize the communication protocol conversion.