Abstract
This paper first introduced the research significance of the heavy monitor system, As well as the research application domain, domestic and foreign research present situation and development tendency of this topic. Then the paper illustrates the design request and the target of the heavy monitor system design in briefly, and simply explained the use of the PROTEL software. In this foundation, the paper illustrates the hardware design of the heavy monitor system in detail. The Hardware design of the system include monolithic integrated modules circuit, A/D switching modules circuit, keyboard display modules circuit, correspondence connection electric modules circuit, power modules circuit and so on . And has produced the heavy monitor system PCB chart which draws by PROTEL software. The paper introduced software design of the system in the next. And have gave the flow chart of subprogram of the system. the source program of the system is compilated by the asm51 assembly language and the C51 higher order language.
Finally the paper has produced the result of the system design and gave the operating instructions of system. After the system test ,the system comprehensive precision may achieve 1/3000F.S (full measuring range), conformed to the OIML three levels of scales requirements.
Keywords: Micro-Controller A/D Converter Serial Port Communication RS-232 Weighing Sensor
