IEC 62056-21:2002

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
   3.1 Terms and definitions
   3.2 Abbreviations
4 Physical properties
   4.1 Electrical current loop interface
   4.2 Electrical interface V.24/V
   4.3 Optical interface
        4.3.1 Construction of the reading head
        4.3.2 Characteristic data of the magnet
        4.3.3 Arrangement of components in the tariff device
        4.3.4 Alignment
        4.3.5 Optical characteristics
5 Character transmission
   5.1 Type of transmission
   5.2 Transmission speed
   5.3 Signal quality
   5.4 Character format
   5.5 Character code
   5.6 Character security
6 Data transmission protocol
   6.1 General
   6.2 Calculation of the block check character
   6.3 Message definitions
        6.3.1 Request message
        6.3.2 Identification message
        6.3.3 Acknowledgement/option select message
        6.3.4 Data message (except in programming mode)
        6.3.5 Acknowledgement message
        6.3.6 Repeat-request message
        6.3.7 Programming command message
        6.3.8 Programming command message using optional
               partial blocks
        6.3.9 Data message (programming mode)
        6.3.10 Data message (programming mode) using
               optional partial blocks
        6.3.11 Error message (programming mode)
        6.3.12 Break message (programming mode)
        6.3.13 Block message (other protocols)
        6.3.14 Explanations of message contents
   6.4 Communication modes
        6.4.1 Protocol mode A
        6.4.2 Protocol mode B
        6.4.3 Protocol mode C
        6.4.4 Protocol mode D
        6.4.5 Protocol mode E (other protocols)
        6.4.6 Entering programming mode (unknown tariff
               device)
        6.4.7 Partial block communication (optional, only
               in protocol mode C)
   6.5 Syntax diagrams
        6.5.1 Readout mode
        6.5.2 Programming mode
   6.6 Data set structure
Annex A (normative) Flow chart for direct local data
        exchange protocol, protocol mode C
Annex B (normative) Wake-up methods for battery-operated
        tariff devices
Annex C (informative) Formatted codes
Annex D (informative) Levels of access - system security
Annex E (normative) METERING HDLC protocol using protocol
        mode E for direct local data exchange
Bibliography
Index
Figures
Tables

Describes hardware and protocol specifications for local meter data
exchange. In such systems, a hand-held unit (HHU) or a unit with equivalent functions is connected to a tariff device or a group of devices.


This publication is of high relevance for Smart Grid.