Wireless Meter Bus
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Transcript of Wireless Meter Bus
Wireless M-Bus protocolfor Advanced Metering Infrastructure
SABER FERJANI
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
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http://about.me/ferjani
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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Outline
1) Introduction1) Sub Ghz Radios2) Difference between AMR & AMI 3) Smart Metering
2) Standardization3) Implementation4) Conclusion
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2.4GHz vs. sub-GHz application trends
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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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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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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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Outline
1) Introduction2) Standardization
1) CENELEC2) Wireless Meter Bus3) Open Metering System
3) Implementation4) Conclusion
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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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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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Stack overview of M-BusManufacturer specific application
OMS DSMR
Application layer (EN-13757-3)
Routing layer (EN-13757-5) (optional)Wireless (EN-13757-4)
Data link layerPhysical layer
Wired (EN-13757-2)Data link layerPhysical layer
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Mode Direction Frequency Description
Stationary
S1 Uni-dir
868,3 MHz
The meter send data several times per day.
S1-m Uni-dirS2 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-dir868.03 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 cyclemode T and C frames can be supported from a single receiver.C2 Bi-dir 869,525
MHzNarrow-
bandN1,N2 Uni/Bi-dir 169 MHz
Optimized for narrowband operation
Frequent Rx & Tx
F2, F2-m Bi-dir 433,82
MHzWake up message from a stationary or mobile transceiver to the meter device to open a communication channel
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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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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
Outline
1) Introduction2) Standardization3) Implementation
1) TI CC112X Transceivers2) Simplified State Diagram3) Command Strobes4) Packet Description
4) Conclusion
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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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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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Simplified State Diagram
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TX mode
RX mode
IDLE
FIFO Error
Freq Calib
Freq Synth ON
Freq Startup
Cristal OFF
SleepSXOFF
SRX/STX/SFSTX
STX SRX
SPWD
SRX/ STX/ SFSTX/ WOR
SFTX SFRX
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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Packet Description
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Packet Description
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Outline
1) Introduction2) Standardization3) Implementation4) Conclusion
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Conclusion
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Thank you for your attention!
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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