BS EN 61142:1993

Cooperating organizations
National foreword
Foreword
1 General
1.1 Scope and object
1.2 Normative references
1.3 Definitions
1.4 List of abbreviations or acronyms used
2 Local bus data exchange - secondary station
      (SLAVE)
2.1 Specification
2.2 General requirements
2.3 Basic principles
2.4 General organization of frames and exchanges
2.5 General organization of the protocol
2.6 PHYSICAL layer
2.7 DATA LINK layer
2.8 SESSION layer
2.9 APPLICATION layer
2.10 Summary and inter-layer relationships
3 Local bus data exchange - primary station (MASTER)
3.1 Introduction
3.2 General reminders
3.3 Tables A received and B returned by the protocol
3.4 Activation of protocol and concatenation of
      exchanges
3.5 PHYSICAL layer
3.6 DATA LINK layer
3.7 SESSION layer
3.8 APPLICATION layer
3.9 Synopsis and inter-relationship between layers
4 Local bus data exchange - hardware
4.1 General
4.2 General characteristics
4.3 Bus specification
4.4 Magnetic plug
4.5 Functional specification of primary station
      transmitter
4.6 Functional specification of primary station
      receiver
4.7 Functional specification of secondary station
      transmitter
4.8 Functional specification of secondary station
      receiver
Annexes
A CRC 16
B DES encryption
B.1 Introduction
B.2 Encryption and decryption algorithms
B.3 DES operating modes
B.4 Choice of operating modes
B.5 Development and tests
C Random number generation (NAO) for response from
      forgotten unit
D Random number generation for authentication
E Coding blocks in a frame
F Possible cases for BERREUR (I,J) and BTIMOUT (I,J)
      fields
G HEX-ASCII correspondence
H Bibliography
ZA (informative) A-deviations
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Describes a method where a number of tariff devices in a given area are connected by a dedicated bus, all of these tariff devices may then be read by connection of a hand-held unit to a central magnetic plug.