维护485总线设备和有关芯片不受伤害。
公共对象层管理网络服务对象，访问现场总线设备，元件层实现不同现场设备间的互操作。
Networks service object was managed, and the field bus equipments were visited with public target layer. The inter-operation among different equipments was realized with component layer.
介绍了PCI总线设备的配置空间配置头的结构及其配置原理，给出了配置空间的访问方法；
The frame of the configuration space configuration header, configuration theory and access method for PCI bus devices are introduced in this paper.
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