作物生長需要一個適宜的環境，在可控環境下，可以不分季節、不分地區地種植所需的作物。控制系統為實現這一目標提供了基礎。控制系統設計采用主從模式，基于RS-485 總線協議，設計全數字化傳感器和測控輸入輸出模塊；采用COM 組件技術設計應用軟件的數據采集、控制算法和控制輸出組件。整個系統經過測試和運行，證明滿足可控環境調控要求。
關鍵詞：現場總線，分布式系統，COM 組件，可控環境，智能節點

Abstract: The crop growth requires a favorable environment. Crops can be grown at different districts, and different seasons in controlled environments. In order to realize this goal, a new control system based on RS-485 bus is designed in the light of the master/slave mode. The design method of intelligent sensors and I/O modules is given, and the program methodology using COM component techniques is described in developing application software with data collection, control algorithm and control output modules. The system passes testing and the
operation shows designed control system can be true of controlled environments.
Key words: field bus , distributed system, COM component, controlled environment, intelligent node