The document discusses the Wireless M-Bus protocol standard used for advanced metering infrastructure (AMI). It provides an overview of sub-GHz radios and their advantages over 2.4GHz radios for AMI applications. It also describes the differences between automatic meter reading (AMR) and AMI, and discusses relevant standards including CENELEC, Wireless Meter Bus, and Open Metering System. Implementation details covered include use of the TI CC112X transceiver chip and its command strobe functions.

1. Wireless M-Bus protocol
for Advanced Metering Infrastructure
SABER FERJANI

2. Who I am?
• Education:
– 2010-2013: ENSI (Computer Science Engineering)
– 2008-2010: IPEIEM (Scientific Preparatory)
• Experience:
– 2013: Graduation project around Qemu translation cache policy
– 2012: Hygrometer & Altimeter based on STM32, Line following
robot, Stepper motor control through Smartphone via Bluetooth.
– 2011: PCB Multilayer Design Layout using Altium
– 2010: Led Display spinning wheel
– 2009: Thermometer based on PIC with serial interface
2
http://about.me/ferjani

3. Framing
• The European Conference for Renewable Energy in
Berlin in 2004 announced that by 2020, the EU would
seek to obtain 20% of its total energy consumption
requirements with renewable energy sources.
• Renewable energy with intermittent generation
necessitates a change in grid operations every few
minutes. With less centralized control, the need for
communications and coordination has become crucial.
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4. Outline
1) Introduction
1) Sub Ghz Radios
2) Difference between AMR & AMI
3) Smart Metering
2) Standardization
3) Implementation
4) Conclusion
4

5. 2.4GHz vs. sub-GHz application trends
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6. Sub Ghz Radios
• Sub-GHz radios can offer relatively simple
wireless solutions. Notable advantages
over 2.4GHz radios include:
– Range: transmission ranges of a kilometer or more.
– Low interference: Sub-GHz ISM bands are mostly
used for proprietary low-duty-cycle links.
– Low power: can operate uninterrupted on battery
power alone for up to 20 years.
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7. Difference between AMR & AMI
• Automatic Meter Reading is an older
technology that only collects electrical energy
consumption and transfers that data from the
electric meter on the home to the utility.
• Advanced Metering Infrastructure, also
known as Smart meters are updated, digital
versions of the traditional electrical meter.
They enables two-way communications with
the meter. Consumers can use information
provided by the system to change their
normal consumption patterns to take
advantage of lower prices.
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8. Smart Grid
• The smart grid represents the full suite of current and
proposed responses to the challenges of electricity
supply.
– Reliability: fault detection, self-healing
– Flexibility in network topology: bidirectional energy flows
– Efficiency: Load adjustment
– Sustainability: permits greater penetration of highly variable
renewable energy sources such as solar power and wind power
– Market-enabling: Only the critical loads will need to pay the
peak energy prices
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9. Outline
1) Introduction
2) Standardization
1) CENELEC
2) Wireless Meter Bus
3) Open Metering System
3) Implementation
4) Conclusion
9

10. CENELEC
• Designated as a European Standards Organization by
the European Commission, CENELEC is a non-profit
technical organization responsible for standardization in
the electro-technical engineering field.
• The national standards organizations of the following
countries are bound to implement European Standard:
Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and
United Kingdom.
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11. Wireless Meter Bus
• The Meter bus is specialized for transmitting
metering data from gas, heat, water or other
meters to a data collector. It is described by
European Norm:
– EN 13757-1: Data exchange
– EN 13757-2: Physical and link layer
– EN 13757-3: Dedicated application layer
– EN 13757-4: Wireless meter readout
– EN 13757-5: Routing layer
– EN 13757-6: Local bus
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12. Stack overview of M-Bus
Manufacturer specific application
OMS DSMR
Application layer (EN-13757-3)
Routing layer (EN-13757-5) (optional)
Wireless (EN-13757-4)
Data link layer
Physical layer
Wired (EN-13757-2)
Data link layer
Physical layer
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13. Mode Direction Frequency Description
Stationar
y
S1 Uni-dir
868,3 MHz
The meter send data several times per day.
S1-m Uni-dir
S2 Bi-dir Bi-dir version of S1
Frequent
Tx
T1 Uni-dir 868,95
MHz
Send intervals of several seconds or minutes
T2 Bi-dir Bi-dir version of T1
Frequent
Rx
R2
Bi-dir
868.03
MHz +
n×60 kHz
Frequency multiplex allows several metering
devices may be read simultaneously
Q The network topology is hierarchical
P Search procedure for discovering the path to
nodes not directly reachable
Compact
C1
Uni-dir
868,95
MHz
Similar to mode T but allows higher data rate
with identical energy budget and duty cycle
mode T and C frames can be supported from a
single receiver.C2
Bi-dir
869,525
MHz
Narrow-
band
N1,N2
Uni/Bi-dir 169 MHz
Optimized for narrowband operation
Frequent
Rx & Tx
F2,
F2-m Bi-dir
433,82
MHz
Wake up message from a stationary or mobile
transceiver to the meter device to open a
communication channel 13

14. Open Metering System
• The application layer of Wireless M-bus can be
enhanced by extensions, being defined from vendor
alliances, like the Open Metering System (OMS) Group,
or from national bodies.
• The OMS group is the only system definition across
Europe which integrates all media (electricity, gas, heat
and water including sub-metering) into one system. It
was developed by the industry in order to guarantee a
future-proof communication standard and interoperability
between all the meter products.
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15. Open Metering System
Electricity
meter
Gas
meter
Water
meter
Heat
meter
Actuator Display
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MUC: Multi Utility
Communication
AMM: Automated Meter Management
Primary Communication
Tertiary Communication
Collector
Back Office
System
Wireless M-Bus
IPv4
Meter

16. Outline
1) Introduction
2) Standardization
3) Implementation
1) TI CC112X Transceivers
2) Simplified State Diagram
3) Command Strobes
4) Packet Description
4) Conclusion
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17. TI CC112X Transceivers
• CC112X is a family of high performance
low power RF transceivers designed for
operation with a companion MCU.
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18. TI CC112X Transceivers
• CC112X can be configured to achieve optimum
performance for many different applications
using the SPI interface.
• The following key parameters can be
programmed:
– Power-down/power-up mode (SLEEP/IDLE)
– Crystal oscillator power-up/power-down (IDLE/XOFF)
– Receive/transmit mode (RX/TX)
– Carrier frequency, Symbol rate, Modulation format, RF output
power, RX channel filter bandwidth
– Data buffering with separate 128-byte RX/TX FIFOs
– Enhanced Wake-On-Radio (eWOR)
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19. Simplified State Diagram
19
TX
mode
RX
mode
IDLE
FIFO
Error
Freq
Calib
Freq
Synth ON
Freq
Startup
Cristal
OFF
Sleep
SXOFF
SRX/STX/
SFSTX
STX SRX
SPWD
SRX/ STX/
SFSTX/ WOR
SFTX SFRX

20. Command Strobes
Address Strobe Name Description
0x30 SRES Reset Chip
0x34 SRX Enable RX. Perform calibration if coming from IDLE
0x35 STX Enable RX. Perform calibration if coming from IDLE
0x36 SIDLE Exit RX/TX, turn off frequency synthesizer and exit
eWOR mode if applicable
0x39 SPWD Enter SLEEP mode when CSn is de-asserted
0x3A SFRX Flush RX FIFO
0x3B SFTX Flush TX FIFO
0x3D SNOP No operation. Used to get access to the chip status.
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21. Packet Description
21

22. Packet Description
22

24. Outline
1) Introduction
2) Standardization
3) Implementation
4) Conclusion
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25. Conclusion
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27. References
• [1] http://www.renewgridmag.com/e107_plugins/content/content.php?content.8946
• [2] Portable and Flexible Communication Protocol Stacks for Smart Metering
Projects, JOURNAL OF ELECTRONIC SCIENCE AND TECHNOLOGY, VOL. 11,
NO. 1, MARCH 2013 (Axel Sikora)
• [3] SWRU295D - Texas Instruments User’s Guide: CC112X/CC1175 Low-Power High
Performance Sub-1 GHz RF Transceivers/Transmitter
• [4] METERING INTERNATIONAL ISSUE 4 2009 - AMI & SMART METERING -
OPEN METERING SYSTEM By Peder Martin Evjen
• [5]
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