BS EN IEC 61158-4-19:2019 Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 19 elements

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

Link: BS EN IEC 61158-4-19:2019 Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 19 elements
Source: BSI Standards