IEC 60870-5-2 : 1.0

TELECONTROL EQUIPMENT AND SYSTEMS - TRANSMISSION PROTOCOLS - SPECIFICATION FOR LINK TRANSMISSION PROCEDURES

International Electrotechnical Committee

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Committees responsible National foreword Specification Introduction 1. Scope and object 1.1 Scope 1.2 Object 2. Normative references 3. Formats and structures of standard transmission        frames 3.1 Format FT 1.1 3.2 Format FT 1.2 3.3 Format FT 2 3.4 Format FT 3 4. Selection primitives and elements of transmission        procedures 4.1 SEND/NO REPLY service 4.1.1 Service primitives 4.1.2 Transmission procedure 4.2 SEND/CONFIRM service 4.2.1 Service primitives 4.2.2 Transmission procedure 4.3 REQUEST/RESPOND service 4.3.1 Service primitives 4.3.2 Transmission procedures 5. Unbalanced transmission 5.1 Specification of length, control and address fields 5.1.1 Length field 5.1.2 Control field 5.1.3 Address field 5.2 Unbalanced transmission services 5.3 Unbalanced transmission procedures 5.3.1 SEND/NO REPLY procedures 5.3.2 Undisturbed SEND/CONFIRM procedures 5.3.3 Disturbed SEND/CONFIRM procedures 5.3.4 Undisturbed REQUEST/RESPOND procedures 5.3.5 Disturbed REQUEST/RESPOND procedures 6. Balanced transmission 6.1 Specification of length, control and address fields 6.1.1 Length field 6.1.2 Control field 6.1.3 Address field 6.2 Balanced transmission services 6.3 Balanced transmission procedures 6.3.1 SEND/NO REPLY procedures 6.3.2 Undisturbed SEND/CONFIRM procedures 6.3.3 Undisturbed procedures with data flow control 6.3.4 Disturbed SEND/CONFIRM procedures Annex A. Time out interval for repeated frame transmission Tables 1. Unbalanced transmission, function codes of control      field in messages sent from primary (PRM = 1) 2. Unbalanced transmission, function codes of control      field in messages sent from secondary (PRM = 0) 3. Balanced transmission, function codes of control      field in messages sent from primary (PRM = 1) 4. Balanced transmission, function codes of control      field in messages sent from secondary (PRM = 0) Figures 1. Relationship between service primitives and      transmission procedures for basic link services 2. Example of the interaction between a polling      procedure and an event-initiated transmission 3. Unbalanced transmission procedures, undisturbed      SEND/CONFIRM procedures 4. Unbalanced transmission procedures, disturbed SEND/      CONFIRM procedure 5. Unbalanced transmission procedures, undisturbed      REQUEST/RESPOND procedures 6. Unbalanced transmission procedures, undisturbed      REQUEST/RESPOND procedures 7. Unbalanced transmission procedures, undisturbed      REQUEST/RESPOND procedures 8. Unbalanced REQUEST/RESPOND transmission procedures,      disturbed REQUEST frame 9. Unbalanced REQUEST/RESPOND transmission procedures,      disturbed RESPOND frame 10. Example of the interaction of service primitives and      transmission procedures in a balanced system 11. Balanced transmission procedures, undisturbed SEND/      CONFIRM procedures 12. Balanced transmission procedures, data flow control 13. Balanced transmission procedures, disturbed SEND      frame 14. Balanced transmission procedures, disturbed SEND and      ignored CONFIRM frame 15. Balanced transmission procedures, disturbed CONFIRM      frame 16. Balanced transmission procedures, disturbed channel      in one direction A.1 Unbalanced transmission procedures, disturbed      primary frame A.2 Unbalanced transmission procedures, disturbed      secondary frame A.3 Balanced transmission procedures, disturbed primary      frame A.4 Balanced transmission procedures, disturbed      secondary frame

Abstract

Applies to telecontrol equipment and systems with coded bit serial data transmission for controlling and monitoring geographically widespread processes. Coverage includes: formats and structures of standard transmission frames; service primitives and elements of transmission procedures; unbalanced transmission; balanced transmission.