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BS EN 13757-2:2018+A1:2023:2024 Edition

BS EN 13757-2:2018+A1:2023:2024 Edition

$167.15

Communication systems for meters – Wired M-Bus communication

Published By Publication Date Number of Pages
BSI 2024 42
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This draft European standard is applicable to the physical and link layer parameters of baseband communication over twisted pair (M Bus) for meter communication systems. It is especially applicable to thermal energy meters, heat cost allocators, water meters and gas meters. NOTE It is usable also for other meters (like electricity meters) and for sensors and actuators. For generic descriptions concerning communication systems for meters and remote reading of meters see EN 13757-1.

PDF Catalog

PDF Pages PDF Title
2 undefined
10 1 Scope
2 Normative references
3 Terms, definitions !and abbreviations”
3.1 !Terms and definitions”
11 3.2 !Abbreviations”
4 Physical layer specifications
4.1 General
12 4.2 Electrical requirements slave
4.2.1 Master to slave bus voltages
13 4.2.2 Slave bus current and multiple unit loads
4.2.2.1 General
4.2.2.2 Mark state current of a slave device
4.2.2.3 Variation of the mark state current over bus voltage
4.2.2.4 Short-term variation of the mark state current
4.2.2.5 Total variation over allowed temperature and voltage range of slave device
4.2.2.6 Maximum bus current for any single semiconductor or capacitor defect
4.2.2.7 Slow start
14 4.2.2.8 Fast change
4.2.2.9 Space state current
4.2.2.10 Input capacitance at the slave terminals: ≤ 0,5 nF
4.2.2.11 Startup delay
4.2.2.12 Galvanic Isolation
4.2.2.13 Optional reversible mains protection
4.2.3 Dynamic requirements
4.3 Electrical requirements master
4.3.1 Parameters
4.3.1.1 Max current (IMax)
15 4.3.1.2 Max allowable voltage drop (Ur)
4.3.1.3 Max baud rate (BMax)
4.3.1.4 Application description
4.3.2 Function types
4.3.2.1 Simple level converter
4.3.2.2 Intelligent level converter
4.3.2.3 Bridge
4.3.2.4 Gateway
4.3.3 Requirements
4.3.3.1 Mark state voltage
4.3.3.2 Space state voltage
16 4.3.3.3 Bus short circuit
4.3.3.4 Minimum voltage slope
4.3.3.5 Effective source impedance
4.3.3.6 Hum, ripple and short-term (<10 s) stability of the bus voltages
4.3.3.7 Data detection current (Reception of slave current pulses)
4.3.3.8 Reaction at large data current (collision state, break signal)
17 4.3.3.9 Galvanic isolation
4.3.3.10 Ground symmetry
4.4 Electrical requirements mini-master
4.4.1 Definition of a mini-master
4.4.2 Requirements
4.5 Repeaters
4.5.1 General requirements
18 4.5.2 Additional requirements
4.5.2.1 Isolation
4.5.2.2 Bit recovery
4.6 Burst and surge requirements
4.6.1 General
4.6.2 Requirements for devices intended for domestic use
4.6.3 Requirements for devices intended for industrial use
5 Link Layer (master and slave)
5.1 General
5.2 Baud rate
5.2.1 Required baud rate
5.2.2 Recommended additional baud rates
19 5.2.3 Special baud rates
5.2.4 Baud rate after reset
5.2.5 Baud rate set
5.2.6 Auto speed mode
5.2.7 Transmit baud rate accuracy
5.3 Bit position
5.3.1 Synchronous transmit bit distortion
5.3.2 Gross transmit bit distortion and minimum signal element
20 5.3.3 Character interval requirement
5.3.4 Practical receive margin and character interval requirement
5.3.5 Minimum signal element
5.4 Byte format
5.5 Block format
5.5.1 Transmission interbyte gaps
5.5.2 Reception interbyte gaps
5.5.3 Idle time between datagrams
5.6 Datagram abort on collision
21 5.7 Datagram description
5.7.1 General
5.7.2 Data integrity
5.7.3 !Communication types”
5.7.3.1 Normalization
5.7.3.2 Request for time critical data
5.7.3.3 Standard readout request
5.7.3.4 Data send master to slave
22 5.7.3.5 !Unsupported communication types
5.7.4 Datagram coding
5.7.5 Addressing
5.7.6 Link layer time schedule
5.7.7 Datagram sequencing
24 6 Tables and figures
29 Annex A (informative) Schematic implementation of slave
30 Annex B (informative)!Examples of protection techniques for M-Bus meters against surge/lightning”
35 Annex C (informative) Slave powering options
36 Annex D (informative) Slave collision detect
37 Annex E (informative) Wire installation
E.1 General
E.2 Type A: small in house installation
E.2.1 Description
E.2.2 Usage
E.3 Type B: large in house installation
E.3.1 Description
E.3.2 Usage
E.4 Type C: small wide area net
E.4.1 Description
38 E.4.2 Usage
E.5 Type D: large wide area net
E.5.1 Description
E.5.2 Usage
E.6 Type E: mini installation (meter cluster)
E.6.1 Description
E.6.2 Usage
39 Annex F (informative) Protocol examples
F.1 Startup
F.2 Slave (meter) readout

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