BS EN IEC 61158-4-3:2019 Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 3 elements

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

Link: BS EN IEC 61158-4-3:2019 Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 3 elements
Source: BSI Standards