IEC 61107:1996

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

Specifies hardware and protocol specifications for local systems. Deals with direct local systems, in which the hand held unit is connected to one tariff device only at a time. Connection can be permanent or disconnectable through an electrical or optical coupling. The protocol took as its basis the basic reference model for communication between open systems (OSI).