BS EN IEC 61158-4-2:2019 Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 2 elements

Process control
Open systems interconnection
Bus networks
Communication procedures
Communication networks
Interfaces (data processing)
Computer networks
Data link layer (OSI)
Fieldbus
Industrial
Automatic control systems
Data transmission

Link: BS EN IEC 61158-4-2:2019 Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 2 elements
Source: BSI Standards