IEC 61158-4-3:2014

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviations
4 Common DL-protocol elements
5 Overview of the DL-protocol
6 General structure and encoding of DLPDUs, and
  related elements of procedure
7 DLPDU-specific structure, encoding and elements
  of procedure
8 Other DLE elements of procedure
Annex A (normative) - DL-Protocol state machines
Annex B (informative) - Type 3 (synchronous): exemplary
        FCS implementations
Annex C (informative) - Type 3: Exemplary token procedure
        and message transfer
Bibliography

IEC 61158-4-3:2014 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. This third edition cancels and replaces the second edition published in 2010 and constitutes a technical revision. The main changes are:
- Corrections in Table A.15 and Table A.16;
- Expired patent removed and added new patents.