（IEC 61158-3-20-2014），英文名为Industrial communication networks - Fieldbus specifications - Part 3-20: Data-link layer service definition - Type 20 elements。
它（IEC 61158-3-20-2014）是在2014-08-13发布，在2014-08-13开始实施。
IEC 61158-3-20:2014 defines the services provided to the Type 20 fieldbus application layer at the boundary between the application and data-link layers of the fieldbus reference model and systems management at the boundary between the data-link layer and systems management of the fieldbus reference model. Type 20 DL-service provides both a connected and a connectionless subset of those services specified in ISO/IEC 8886.
本标准文件共有58页。 IEC 61158-3-20-2014 Industrial communication networks - Fieldbus specifications - Part 3-20_ Data-link layer servi.pdf(1.36 MB)
