Multimedia central controller is multimedia equipment which is used for multimedia teaching equipment centralized control. It can greatly facilitate the use of multimedia equipment ,reduce the cost of management and conserve energy. The design of the multimedia central controller installed into the PC procedural programming, the central controller multimedia projector parameter setting of a system whose parameters include : clock time, eight-time control and the use of the projector's startup code, shutdown code, RGB1, RGB2, Video, S-video and so on, through the RS-232 serial port with the central controller for multimedia communications The software use Visual C + + software for development programming, use MSComm controls to develop serial communication, ActiveX controls of serial communication Programming in windows, and ClassWizard to definite CMSComm type control object. Then, add controls and Serial incident message processing function OnComm()in the dialog box. Open the serial port, set serial port parameters and send data. Adding a check received button in sending part to choose the sending form in text or hexadecimal.
Keywords : projector; Visual C + + 6.0; Mscomm control; Serial Communication