The link layer provides the physical interface to the communication medium (such as an Ethernet device).
链路层(link layer)提供了通信介质的物理接口(例如以太网设备)。
The AS-I interface network layer was used to carry out the interconnection communication between sensor and executor.
接口网络层用于传感器和执行器的联网通信。
The hardware equipments layer implement the communication protocol—SGMP with the intelligent gateway equipments in the residence, and accomplish the application of interface of the service layer.
硬件设备代理层实现了同小区内智能网关设备的通信协议SGMP ，同时完成了对服务层接口的调用；
The device Abstract Layer provides a set of standard communication interface functions unrelated with specific device, which is mapped to device drivers by file table, device table and driver table.
设备抽象层为上层应用程序提供了一套标准的、与设备无关的通信接口，并且通过文件描述表、设备描述表和驱动描述表建立了从通信接口到设备驱动的映射。
From bottom to top, the system is plotted out bus driver layer, device function driver layer, communication layer and user-interface. Each layer provides service to the layer above by interface style.
由下往上将整个驱动软件系统分为总线驱动层、设备功能驱动层、通信层和用户界面等层次，每一层都以接口的形式为上层提供服务。
From bottom to top, the system is plotted out bus driver layer, device function driver layer, communication layer and user-interface. Each layer provides service to the layer above by interface style.
由下往上将整个驱动软件系统分为总线驱动层、设备功能驱动层、通信层和用户界面等层次，每一层都以接口的形式为上层提供服务。
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