INTRODUCTION
1 Scope
  1.1 General
  1.2 Specifications
  1.3 Procedures
  1.4 Applicability
  1.5 Conformance
2 Normative references
3 Terms, definitions, symbols, abbreviations
  and conventions
  3.1 Reference model terms and definitions
  3.2 Service convention terms and definitions
  3.3 Other terms and definitions
  3.4 Abbreviations
  3.5 Symbols
  3.6 DLPDU IDN concept
4 DL-protocol overview
5 Basic DLPDU structure
  5.1 Overview
  5.2 MST DLPDU
  5.3 MDT DLPDU
  5.4 AT DLPDU
6 Network management methods
  6.1 Overview
  6.2 Enable and disable cyclic communication
  6.3 File transfer
  6.4 Status procedures
7 Data transmission methods
  7.1 Overview
  7.2 SVC
  7.3 RTC
8 DL management
  8.1 Overview
  8.2 Access to PhL
9 Error handling and monitoring
  9.1 Invalid telegrams
  9.2 Response to MDT and AT telegram
      failure
  9.3 Reaction to handshake timeout
  9.4 Service channel error messages
  9.5 Reaction to error messages in the
      service channel
  9.6 Error counters in the master and the slave
  9.7 Error effects on communication phases
  9.8 Monitoring in the master
  9.9 Monitoring in the slave
Annex A (normative) - IDN - Identification numbers
      A.1 IDN specification
      A.2 Identification numbers in numerical orders
      A.3 Detailed specification of
          communication-related IDNs
Annex ZA (normative) - Normative references to international
                       publications with their corresponding
                       European publications
Bibliography