The paper discusses the application area, configuration and electric specification, and then analyzes thoroughly the code formats, data transmission, access protocol and collision management of DALI. Afterward the characteristics of DALI system are explained through an example. 本文对DALI系统的应用范围、结构组成和电气特性进行阐述,并对DALI的指令编码格式、数据传输规则、访问协议和冲突处理方法进行详细分析,然后通过实例说明DALI系统的特性。