| With the running speed accelerating, the transportation load increasing, and the idle time declining of modern subway, the security and reliability of the train become more and more important. The train monitoring system is designed to realize automatic drive, speed limit, malfunction analysis and remote control. These functions reduce the risks from manual operation, and enhance the response time and performance.This paper described the detailed design of the central control unit used in the train monitoring system, which belonged to the project "Localization of Guangzhou Metro Line No.1". The new train bus and vehicle bus were chosen in this design based on the analysis of performance of the original module bus, and detailed research of the protocol convertion model in application layer was made based on the deep analysis of performance of the bus.Central control unit consisted of 4 modules: HDLC communication bus module, vehicle and train CAN communication bus module, data buffer module, the host CPU module. The HDLC module took charge of main control tasks of the monitoring system using high-level communication controller; The CAN module collected the status of vehicle by CAN controller and transceiver; The data buffer module finished the data change of HDLC and CAN via dpram;The host CPU module was designed with real-time OS-uC/OS-II transplanted the ARM miro controller to schedule the system mutil-tasks. Meanwhile the uC/OS-II was improved through increasing the Round-Robin scheduling strategy. Then the performanced possibility of periodic mutil-tasks was proved and the multi-influencing factor was tested repeatedly to achieve the most superior schedule making use of RM model fully to guarante the security, reliability, rationality.Through several networking tests based on building simulation platform, the central control unit in montoring system for metro Guangzhou Linel was verificated to be reliable and high response under heavy load environment and localized successfully.
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