GB/T 20540.2-2006
ActiveDigital data communication for measurement and control - Fieldbus for use in industrial systems Type 3: PROFIBUS specification - Part 2: Physical layer specification and service definition
测量和控制数字数据通信 工业控制系统用现场总线 类型3:PROFIBUS规范 第2部分:物理层规范和服务定义