BS EN IEC 61158-3-19:2019 Industrial communication networks. Fieldbus specifications Data-link layer service definition. Type 19 elements

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

Link: BS EN IEC 61158-3-19:2019 Industrial communication networks. Fieldbus specifications Data-link layer service definition. Type 19 elements
Source: BSI Standards