| This paper introduces a computerized monitor & control system applied in the laboratory simulative system of tractor梚mplement combination, and the methods of the system design and developing. The system have primary functions that include accepting experimental data sent by slave microprocessers, displaying real梩ime experimental curve line and data, saving real梩ime experimental data and querying former experimental curve line and data. Further more, this system carries out some assistant functions, such as validating identity of user, protecting system onæ¢ine, modifying password, providing help, and so on. By dint of operation and display interfaces of the system, Visualization of the test of the laboratory simulative system of tractor梚mplement combination is made true, and the system provides certain means and environment for in梔epth research of the whole task. This system is based on Windows 98 operation system, and by use of C/C++ program language, the system is developed by Visual C++ 6.0 included in Microsoft Developer Studio. The system adopts the method of Object桹riented Programming(OOP) and fully apples MFC (Microsoft Foundation Class ) of Visual C++ 6.0. Serial communication between master PC and slave microprocessors is achieved successfully by use of MSComm of ActiveX controls in Visual C++ 6.0 and RS?32C of PC, and parallelly accepting data is achieved by applying Multi梩hread technique, and a Microsoft Access database file is linked to the system by the method of Open Database Connectivity(ODBC). Furthermore, possession of friendly interface is fully considered in course of developing, according to the principle of human? computer interface design and by apply of fashionable window style, communication between user and computer is made very easy. Through validation of practical test on test platform, it is made clear that the system is reliable and can meet test抯 needs of the laboratory simulative system of tractor梚mplement combination.
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