Research On Scientific Instrument Interface Module (SIIM) Based On CAN Bus And ARM

As a new platform, the cabled seafloor observatory can be used to achieve the goal of long-term, in-situ, real-time and continuous oceanographic observation. Scientific Instrument Interface Module (SIIM) is a key component of the cabled seafloor observatory, providing various interfaces for instruments and sensors.This paper introduces the development of ocean observation technology and the boom of the research and construction of cabled seafloor observatory all over the world, and reviews the research status of SIIM. Since CAN bus is used in this subject, this paper introduces the application of CAN bus in marine equipment and the basic principle of CAN bus.According to the statistical data about the interface types of marine instruments, technical indicators of SIIM are put forward. The overall design of SIM is proposed based on the indicators. Focusing on the Data acquisition and transmission system, this paper presents implementation scheme based on CAN Bus and ARM. The system adopts the distributed control mode. The port monitoring board detects and controls the status of each port, transferring data to core control board via CAN bus. The Host computer software is developed to display the working status of SIIM. The communication between host computer software and SIIM is based on C/S model via TCP.Marine equipment requires for high reliability, while the reliability is affected by heat dissipation issue. The power system is the main part that generates heat in SIIM, so the structure of SIIM is optimized to improve the heat dissipation efficiency. The finite element software ANSYS Workbench is used to simulate the heat dissipation of SIIM. The result shows that the heat dissipation design of SIIM is good enough to satisfy the temperature requirement of inner components, compared with the experimental data.Finally, the system integration and sea trial of SIIM are introduced. Functions of control system are verified by experiments in the lab. During the sea trial, the performance of SIIM is tested, but some problems are also found. Much experience for the development of marine equipment is gained by analyzing the problems and putting forward solutions.