Research And Development Of Computer Total Distributed System Of Intelligent Greenhouse

In this paper, the whole design plan of computer total distributed system in intelligent greenhouse environment control is purposed. The control system consists of PC and multi-single chip 8031 that is a principal and subordinate computer system. PC mainly performs following functions: parameter setting and data processing, storing, analysis, display and print, etc. Using embedded self-developing idea to develop single-chip applying system, besides of the function of self-developing system, it also should accomplish missions of real-time control on greenhouse environment, such as data gathering, transmitting, and processing.Through the study of single-chip applying system in computer total distributed system of intelligent greenhouse, the idea of embedded and self-developing of single-chip is purposed, and hardware and partial software of applying system are designed. Especially BUS is designed. Advantages of STD BUS and structure of PC/104 BUS are referred to design the USER-BUS, which uses three bus structures, i.e. Address BUS(AB), Data BUS(DB) and Control BUS(CB). It is well compatible, and the applying system has flexibility and common use and is convenient to extent for users.The research extents the single-chip system on the basis of the 8031 single-chip minimal system. Because there is no inner RAM in CPU of 8031 single-chip and addresses of program memory and data memory are organized separately, in order to attain the goal of self-developing and to realize self-developing function of single-chip applying system, the address of program memory and data memory should be organized uniformly to be read and written for program memory and be revised for it during debugging, modifying and unloading programs.Designing of whole single-chip applying system includes micro-processor, applying part and power part. The designing of microprocessor is a key. In the part, there are following contents: single-chip and memory circuit, interrupt control circuit, decoding circuit, parameter area circuit, watchdog circuit and serial communication interface circuit, etc.In this paper, serial communication interfaces between upper PC and lower single-chips are designed. Upper PC communication software uses Visual C++6.0 to program, and lower communication software uses assembly language to program, therefore, data serial communication between upper and lower computers are realized.