Taking the introduced avl emission test equipments as the development object , this paper sets up a vehicle exhaust host computer system and establishes a distributed computer system as controlling scheme . by serial transmission technology and the ak communication protocol among the emission test equipments , the hardware is founded . by directed to object programming technique and visual programming language , the software of host computer system is developed 本文以引進(jìn)的avl排放測試設(shè)備為開發(fā)對象,建立了汽車排放主控計算機系統(tǒng),確定其控制方案為分布式計算機控制系統(tǒng);利用串行端口通信技術(shù),以排放測試設(shè)備之間的通信協(xié)議? ak協(xié)議為基礎(chǔ),構(gòu)建了系統(tǒng)硬件;采用面向?qū)ο蟮木幊碳夹g(shù)及可視化的編程語言vc + +開發(fā)了主控計算機系統(tǒng)軟件。
In computing, a visual programming language (VPL) is any programming language that lets users create programs by manipulating program elements graphically rather than by specifying them textually. A VPL allows programming with visual expressions, spatial arrangements of text and graphic symbols, used either as elements of syntax or secondary notation.