Foreword
Introduction
1. General
1.1 Scope
1.2 Normative references
2. Definitions
3. Physical properties
3.1 Electrical interface
3.2 Optical interface
4 Character transmission
4.1 Type of transmission
4.2 Transmission speed
4.3 Signal quality
4.4 Character format
4.5 Character code
4.6 Character security
5. Data transmission protocol
5.1 General
5.2 Calculation of the block check character
5.3 Message definitions
5.4 Communication modes
5.5 Syntax diagrams
5.6 Data set structure
Annexes
A. Flow chart for direct local data exchange protocol,
mode C
B. Provision for battery-operated tariff devices
C Formatted codes