KNX TUTOR SEMINAR
Home and Building Management Systems KNX Association
Serial Data Transmission and KNX Protocol Serial Data Transmission_E0808f 2/41
Table of Contents
1 Fundamentals of Serial Data Transmission ................................................................4
1.1 Introduction and Terminology .............................................................................4
1.1.1 Hierarchical Problem Division .........................................................................4
1.1.2 Hierarchical Structures ...................................................................................4
1.1.3 Where in this Hierarchy do we find the Building Systems Buses? ..................5
1.1.4 Classification of Serial Buses .........................................................................6
1.1.5 Error Detection Techniques ............................................................................9
2 The OSI Reference Model (ISO 7498) ..................................................................... 11
2.1 Introduction to the OSI Reference Model ......................................................... 11
2.1.1 Why are Standards Necessary? ................................................................... 11
2.1.2 Objective of the OSI Reference Model ......................................................... 11
2.2 The Principle of the OSI Reference Model (OSI) .............................................. 11
2.2.1 The Seven Layers of the OSI Reference Model ........................................... 12
2.2.2 The Two Types of Communication ............................................................... 12
2.2.3 Protocol Data Units (PDUs) .......................................................................... 13
2.3 Principle Functions of the Layers; Implementation in KNX ............................... 14
2.3.1 General ........................................................................................................ 14
2.3.2 Application Layer (Layer 7) ........................................................................... 14
2.3.3 Presentation Layer (Layer 6) ........................................................................ 15
2.3.4 Session Layer (Layer 5)................................................................................ 15
2.3.5 Transport Layer (Layer 4)
............................................................................. 15
2.3.6 Network Layer (Layer 3) ............................................................................... 16
2.3.7 Data Link Layer (Layer 2) ............................................................................. 18
2.3.8 Physical Layer (Bit Transmission, Layer 1) ................................................... 24
3 KNX Telegram structure .......................................................................................... 26
4 Different APCI Codings ............................................................................................ 28
4.1 General ............................................................................................................ 28
4.2 Detailed Explanation of Several APCIs ............................................................. 29
5 Interpretation of a telegram sequence: Allocation of an individual address .............. 34
6 KNX Easy Installation Principles .............................................................................. 38
6.1 General ............................................................................................................ 38
6.2 E-Mode channels ............................................................................................. 38
6.2.1 Ctrl-Mode ...................................................................................................... 38
6.2.2 PB-Mode ...................................................................................................... 39
6.2.3 LTE-Mode ..................................................................................................... 40
