Secondly two layers are described in the thesis: the data link layer(DLL) and the fieldbus access sublayer(FAS).

分析了两个目标层：数据链路层和现场总线访问子层。

youdao

Secondly two layers are described in the thesis: the data link layer(DLL) and the fieldbus access sublayer(FAS).

分析了两个目标层：数据链路层和现场总线访问子层。

youdao