CSN EN 61158-4-1 ed. 2

CSN EN 61158-4-1 ed. 2 This part of IEC 61158 specifies procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed data-link service provider and the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units.
Original English text of CSN EN Standard.
The price of the Standard included all amendments and correcturs.