The Design Of Ship Cabin Extended Alarm System Based On CAN Bus

The ship cabin extended alarm system is an important part of the monitoring and alarm systems, which is set up for the unmanned engine room. The unmanned engine room has become a general requirement of the newly-built ships, in the circumstance of unmanned engine room, once any equipment breakdown, the extended alarm system will sent the alarm signal to the extended alarm box distributed in bridge, public places, and the cabins of engineers, that signal will inform the engineer on duty to take corresponding treatment.This paper designs a ship engine room extended alarm system based on Cortex-M3 and CAN bus communication combines with network technology and embedded technology. This system consists of several extended alarm nodes, they are connected by CAN bus. STM32F107VC processor is the control core of this system, around which related peripheral circuits are designed. The programs are completed in Keil MDK, and programmed into internal FLASH of the STM32 with the help of J-Link simulator, and then the system debugging is finished by using PC debugging software. The system communication adopts CAN communication bus, the use of double redundancy CAN bus can realize the interconnection of each module in the system. At the same time, each module can communicates by the RS-485.Considering the existence of serious electromagnetic interference in the ship engine room, several anti-interference measures are designed to guarantee the stability and reliability of the system. Finally, the paper summarizes some potential problems during design, reviews the whole design process, and puts forward outlooks about follow-up work.