Kamstrup M-Bus Master MultiPort 250L, Installation And User Manual, Page: 2 / 28

Contents
1 Introduction 3
1.1 Design 3
2 Functionality 4
2.1 Overview of functions 6
3 Connections 7
3.1 Overview of connections 8
3.2 Power supply 9
3.3 USB 9
3.4 RS-232 12
3.5 RS-485 13
3.6 M-Bus Output 13
3.6.1 Current and voltage 13
3.7 M-Bus Repeater Input 14
4 Cabling 15
4.1 Special features of M-Bus Master
MultiPort 250L 15
4.2 Electrical conditions in an M-Bus
network 15
4.2.1 M-Bus modules 16
4.3 Installation parameters 16
4.3.1 Cable 16
4.3.2 Cable topology 17
4.3.3 Examples of network sizes 20
5 M-Bus Addressing 21
5.1 Primary addressing 21
5.2 Secondary addressing 21
5.3 Enhanced secondary addressing 21
6 M-Bus communication 21
6.1 Communication speed 21
6.2 Transparent reading 22
6.3 Light Emitting Diodes 22
6.3.1 Power 22
6.3.2 Request 22
6.3.3 Data 23
6.3.4 Overload 23
7 GSM/GPRS 24
8 Dimensioned drawings 25
9 Technical data 26
10 Ordering numbers 27
55121391_B1_GB_12.2013 2