TRANSMASTER Interface Specification for POS Terminals based on ISO 8583:1993(E)

1 Introduction

This document describes an interface whose purpose is to support magnetic and smart card transactions generated by POS (Point-Of-Service) terminals.

The interface is based on ISO 8583:1993(E) standard. While this specification is largely self contained, some readers may need or wish to seek further clarification and details from the ISO document.

Every effort has been made to remain consistent with the ISO specification. It can be assumed that anything not explicitly mentioned here conforms to the ISO specification.

If data elements mentioned as "optional" are received by the terminal, they must not cause terminal to fail.

2 General information

2.1 Communications

2.1.1 Communications infrastructure

2.1.2 Communications through erratic network

2.1.3 Communications through durable networks

3 Authorization, reversal and network messages

3.1 Message body

3.1.1 General message structure

3.1.2 Types of messages and their flow

3.1.3 Tables of bitmaps

3.2 Description of fields

4 Financial, financial advice, and reconciliation messages

4.1 Message flow diagrams

4.1.1 Financial messages

4.1.2 Financial advice messages

4.1.3 Repeat messages

4.1.4 Reconciliation messages

4.2 Contents of messages

4.2.1 Contents of financial messages

4.2.2 Financial advice messages

4.2.3 Contents of reconciliation messages

4.2.4 Description of field 48 for 15XX message class only

4.3 Description of fields

5 File action and notification messages

5.1 File action messages

5.1.1 File action flow diagrams

5.1.2 Contents of messages

5.1.3 Description of field 72

5.2 Administrative message class

5.2.1 Message flow diagrams

5.2.2 Contents of administrative notification messages

5.2.3 Description of field 72

6 APPENDIX

6.1 Fixed set of fields

6.2 Cryptography

6.2.1 Preparing DES cryptographic keys

6.2.2 PIN-based transactions

6.2.3 MAC calculation and verification

6.2.4 Data ciphering in the message

6.2.5 Derived Unique Key Per Transaction

6.3 Description of ICC Related Data

6.3.1 Description of field 55

6.3.2 Coding principles for ICC Related Data sub-field elements

6.3.3 Examples

6.4 Special types of requests

6.4.1 Statement request

6.4.2 Payment

6.5 CRC calculation

6.6 The whole set of possible response codes

6.7 Examples of Link Set-up Protocol Diagrams

6.7.1 Telephone Network link to X.25 PAD

6.7.2 Telephone Network link to the Host

6.7.3 Dedicated line link to X.25 PAD

6.7.4 Telephone Network link to Internet

6.7.5 Dedicated line link to Internet

7 References