Table of Contents

Foreword<br>Introduction<br>1. Scope and object<br>2. Normative references<br>3. General characteristics of A-XDR<br>4. Structure of an encoding<br>5. Rules for encoding<br>&nbsp;&nbsp;&nbsp;&nbsp;5.1 The Identifier field<br>&nbsp;&nbsp;&nbsp;&nbsp;5.2 The Length field<br>&nbsp;&nbsp;&nbsp;&nbsp;5.3 The Contents field<br>6. Encoding procedures<br>&nbsp;&nbsp;&nbsp;&nbsp;6.1 Encoding of an INTEGER value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.2 Encoding of a BOOLEAN value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.3 Encoding of an ENUMERATED value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.4 Encoding of a BIT STRING value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.5 Encoding of an BYTE STRING value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.6 Encoding of a CHOICE value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.7 Tagged types (implicit, explicit and ASN.1 <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;explicit tagging)<br>&nbsp;&nbsp;&nbsp;&nbsp;6.8 OPTIONAL and DEFAULT COMPONENTS<br>&nbsp;&nbsp;&nbsp;&nbsp;6.9 Encoding of a SEQUENCE value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.10 Encoding of a SEQUENCE OF value<br>&nbsp;&nbsp;&nbsp;&nbsp;6.11 Encoding of the VisibleString type<br>&nbsp;&nbsp;&nbsp;&nbsp;6.12 Encoding of the GeneralizedTime type<br>&nbsp;&nbsp;&nbsp;&nbsp;6.13 Encoding of the ASN.1 NULL type/value<br>Annex A (informative) Extensibility<br>Annex B (informative) ASN.1 types and keywords used in DLMS<br>Annex C (informative) Examples oF A-XDR encoding for DLMS PDUs<br>Figure 1 - The basic BER structure<br>Figure 2 - The structure of a constructed BER encoding<br>Figure 3 - The structure of a constructed A-XDR encoding<br>Figure 4 - Structure of the variable-length integer encoding

Abstract

Gives a set of encoding rules that may be used to derive the specification of a transfer syntax for values of types that are defined in the DLMS core standard with use of the ASN.1 notation (see IEC 61334-4-41). These rules are also applicable for decoding such a transfer syntax so as to identify the data values being transferred.

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Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	TC 57