Design And Realization Of The Central Control System In Modularized Multimedia Network

This study is to solve the technical issues of complicated central control unit (CCU), which will affect the teaching schedule if breakdowns are not fast remedied in the CCU. In addition, in order to unify the CCUs of 260 multi-media classrooms as well as the operation procedurein our school, a modularized multi-media network CCU based on fundamental bus structure was designed to solve the problems of the maintenance of the multi-media CCU. In the new-designed CCU, every functional module was designed as the individualsheet bar, which could be pulled out and installed at any moment.Firstly, on the basis of plentiful literatures related to the problems which will be solved in this paper, the key technology in this topic is analyzed, and the developed situation and the research meaning of the multi-media CCU are stated. Demand analysis is conducted based on the present situation of the multi-media rooms in our school, formulating the designing principles of the CCU system, comparing the different designing schemes of current CCU, and determining the hardware block diagram.Secondly, the CCU host and control panel are designed and developed independently, giving the designed circuit diagram and corresponding technical specifications of each module. The main controlled module adopts P89LPC952single chip microcomputer (SCM) as the core of the central controlled system, determining the overall structure of the system. The host CUP commands the function operations of VGA switch module, audio switch module, power module, ATA communication module and network module through bus structure. ATA communication module communicates with the upper computer and projector through RS232 technology. The power module controls the relay to command the powers of the peripheral equipment. QT1101 touch technology is employed in the control panel, including the circuit diagrams of keyboard, indicator light and buzzer. The authorized button module uses 1-wire communication technology to accomplish one key open intelligently. The network module adopts TCP/IP agreement to realize the remote control based on the campus network (CN).Finally, operation software of the CCU host is designed by employing C51 single chip microcomputer (SCM), giving the designing and accomplishing schemes of the software in network module and control panel, introducing the utilization situations of the host computer configured software and remote controlled software.The new-designed and debugged multi-media CCU system which has been put into teachinghas accomplished the function of every module, achieving the original designed intention, stable operating conditions, and unifying the operation procedure of all the multi-media classrooms in our school. The designing of modularized sheet bar brings much convenience to the maintenance and management of the multi-media equipment, and contributes the development of multi-media teaching in our school.