BS 6556-3:1985
Current
The latest, up-to-date edition.
Low speed digital signals for use in coal mines Specification for message protocols
Hardcopy , PDF
English
01-31-1985
Foreword
Committees responsible
Specification
0 Introduction
1 Scope
2 Definitions and abbreviations
3 Link configurations
4 Transmissions
5 Checks
6 Data only protocol (DOP)
7 Simple asynchronous protocol (SAP)
8 Marking
Appendix
A Method for the generation and verification of check
field (CF)
Tables
1 Start of message (SMB) codes
2 Valid address bytes
3 Stuffing codes
Figures
1 The components of the byte transmission
2 Operation using DOP
3 Operation for 1 to 15 slaves using SAP
4 Application data message (ADM) and broadcast message
(BRO) format
5 Link control message (LCM) and initialization
message (IM) format
6 A 2 byte transmission
7 Transmission envelope from slave with modem
8 Slave response to poll (current loop link)
9 Slave response to poll (MODEM link)
10 Composition of message address byte (AB)
11 Composition of application data description byte
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