測控系統(tǒng)性能的優(yōu)劣是溫室作物優(yōu)質(zhì)、高產(chǎn)、高效栽培的關(guān)鍵。針對當前溫室測控系統(tǒng)中需要解決的各種問題——降低成本、降低功耗、提高抗干擾能力、提高實時性和通信速率，提出了CAN總線在基于微控制器MC68S08QG8的測控系統(tǒng)中的應(yīng)用，詳細介紹了單個智能節(jié)點的硬件設(shè)計和軟件實現(xiàn)，設(shè)計了簡單的CAN總線應(yīng)用層協(xié)議。運行結(jié)果表明該系統(tǒng)結(jié)構(gòu)簡單、可靠性高、實時性強。

　　Abstract:

　　Measurement and control system performance is key to greenhouse crop high quality， high yield and efficient cultivation. In view of the current greenhouse measurement and control system needs to solve the problems， reducing cost， reducing power consumption， improving anti-jamming capability， improving real-time and communication. The paper proposed application of CAN bus based on microcontroller MC68S08QG8 measurement as communication profile， and introduced a single intelligent node of the hardware design and software realization in detail. A simple CAN application layer protocol was designed. The running result shows that the system has performances of simple structure， high reliability and strong real-time.