PD IEC TR 62056-51:1998

Foreword
Clause
1 General
   1.1 Scope
   1.2 Normative references
2 General description
   2.1 Basic vocabulary
   2.2 Sub-layers and protocols
   2.3 Specification language
3 Transport sub-layer
   3.1 Transport + protocol
   3.2 General information
   3.3 Transport protocol classes
   3.4 Transport services and service primitives
   3.5 Description of transport protocol data units
        (TPDUs)
   3.6 Transport parameters
   3.7 State transitions
   3.8 List and processing of errors
4 Application sub-layer
   4.1 Application+ protocol
   4.2 General information
   4.3 Security of exchanges
   4.4 Authentication of Client and Server
   4.5 Confidentiality of exchanged data
   4.6 Application context
   4.7 DLMS context
   4.8 Application context
   4.9 Description of application protocol data units
        (APDUs)
   4.10 Management of exchanges
   4.11 Application parameter
   4.12 State transitions
   4.13 List and processing of errors
Annex A (normative) Specification language
Annex B (normative) List of fatal errors
Annex C (normative) Authentication and random numbers
Annex D (normative) Masking algorithm for data
        confidentiality
Annex E (normative) Identifiers and masking mode

Gives an architectural application layer used for communication with metering equipments in general, whatever the associated physical medium and lower layer protocols in a collapsed three-layer model are. Specifies the protocols that are applicable to the application layer except the DLMS (Distribution Line Message Specification) model, which is covered by IEC 61334-4-41.