B meters IWM-LR3 Manuel utilisateur
IWM-LR3 - IWM-LR4 User Manual v1.0
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This manual offers a simple guide for getting started with the module, as well as conguration and information
for advanced users. The IWM-LR3 - IWM-LR4 module is designed with focus on ease-of-use and reliable
operation in LoRaWAN networks.
The unit is shipped in sleep mode. All functions, including radio, are deactivated. The device activates when it is
mounted on the meter and the rotating inductive index on the meter completes +/- 5 revolutions. This equals to
+/- 5 liters on the IWM-LR3 (thus the meters CPR-M3-I, GMDM-I, GMB-RP-I and GMB-I) and +/- 50 liters on the
IWM-LR4 on the meter WDE-K50 from DN50 to 125 and +/- 500 liters on the IWM-LR4 on the meter WDE-K50
from DN150 to 200.
The following safety precautions must be observed during all phases of the operation, usage, service or repair
of this product.
• Read the product manual.
• Do not modify the product.
• Theproductshouldnotbeexposedtoextremeheatoropename.
• The device must not be exposed to harsh chemicals or solvents.
• The labelling of the product may not be changed, removed or made unrecognizable.
IWM-LR3 – IWM-LR4
User Manual
IWM-LR3 - IWM-LR4 2User Manual v1.0
Module status and state check
The sensor has four status: Initial, Joining, Congure and Operational state.
Start-up Sequence
When the device has joined the network, startup transmissions are performed to make it easier to congure
the device using downlink commands. When the startup sequence is completed normal operation is started.
The full joining procedure should take maximum 20 minutes.
The module starts transmitting with Spreading Factor (SF) 12, for maximum performance. It will then
automatically adjust the SF up to a minimum of SF7 in order to balance performance and energy consumptions.
INITIAL
JOINING
CONFIGURE
OPERATIONAL
+/-5 index revolutions
Connected to LoRaWAN
network
Polled network conguration
commands during 2 minutes
Reset
(OTA or NFC)
IWM-LR3 - IWM-LR4 User Manual v1.0
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Correct module startup - Summary
1. Module provisioning on the network server - Activation on the network
2. Physical installation of the module on the meter
3. Joining procedure start-up (+/- 5 rotating index revolutions)
4. Vericationofthemodulejoinprocedurecompletion
1. Module provisioning – Activation on the network
Standard devices are congured as OTAA (Over The Air Activation). It is possible to order a batch of devices
congured as ABP (Activation By Personalization).
Standard devices are congured with the AppEUI (a.k.a. JoinEUI) E41E0A90000FFFFF. It is possible to order a
batch of devices congured with a custom unique AppEUI. For this contact B METERS support.
Upon receiving your IWM-LR3 - IWM-LR4 you can request from B METERS the necessary information to
connect it to your network server. This consists of the following:
- DevEUI
- AppKey
These codes are unique for each device. The DevEUI can be seen as a unique identication code, the AppKey is
a securely generated authentication code.
The rst step you should take is to simply provision the network server. This can be any LoRa system that you
would like to integrate the sensor with the AppEUI.
The second step is to provision the application server with your unique DevEUI and AppKey.
Digital activation process
- Provision network server with AppEUI
- Provision application server with unique DevEUI and AppKey
IWM-LR3 - IWM-LR4 4User Manual v1.0
2. Physical installation
When the meter has been digitally congured into your Lora network it is time to physically activate and
install it. Prior to the installation of the IWM-LR3 - IWM-LR4 unit on the meter, remember to remove the
protective metal sticker from the module.
You can then proceed with the module mounting on the meter.
Physical installation process
Phase 1. Mount IWM-LR3 - IWM-LR4 unit on the water meter
IWM-LR3
module
+
CPR-M3-I
meter
CLICK!
Step 1 Step 2 Step 3
IWM-LR3
module
+
GMDM-I
GMB-RP-I
GMB-I
meter
CLICK!
Step 1 Step 2 Step 3
IWM-LR4
module
+
WDE-K50
meter
Step 1 Step 2 Step 3
IWM-LR3 - IWM-LR4 User Manual v1.0
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Phase 2. Mount the locking screw and adhesive seal
3. Joining procedure start-up
Let water flow in the meter, in order to make the rotating index spin.
To initialize the module and send joining requests to the desired network server, it is necessary to let the
inductive index of the dial rotate for +/-5 revolutions:
- On the GM and CPR-M3-I models, this corresponds to +/- 5 liters.
- On the WDE-K50 models, this corresponds to +/- 50 or 500 liters, depending on the K value set.
4. Verication of the module join procedure completion
Verify on the network server that the module has joined correctly.
CPR-M3-I meter GMDM-I | GMB-RP-I | GMB-I meter WDE-K50 meter
IWM-LR3 - IWM-LR4 6User Manual v1.0
Alarms
The IWM-LR3 - IWM-LR4 LoRa module have several alarm functions built in.
When an alarm is detected the corresponding alarm flag in the status data is set. When an alarm flag is set the
status data is included in every report.
The alarm flag can be reset manually using a Downlink command or via NFC.
MAGNETIC ALARM
If a magnetic eld is detected for 10 minutes, the magnetic alarm is triggered.
REMOVAL ALARM
It occurs when there is a condition of three uncovered coils at the same time (=module was dismounted from
the meter).
SENSOR FRAUD ALARM
Occurs when there is a condition of three coils simultaneously covered or transitions of state not allowed
(=foreign object is obstructing the rotating index/coils communication).
LEAKAGE ALARM
If the passage of minimum 3 liters in an houd is detected (for K = 1) or 10 liters in an hour (for K = 10) or 100
liters in an hour (for K = 100), the alarm is recorded for a number of consecutive hours equal to 12.
If the leakage is considered resolved (=the flow stops), the loss alarm is reset.
REVERSE FLOW ALARM
It occurs when there is a condition of reverse flow passage of more than 20 liters.
LOW BATTERY ALARM
The battery alarm is set when the battery voltage, measured at the end of a radio transmission, is lower than
the threshold set in EEPROM (Low Battery Threshold). For the alarm to be activated, the measurement must be
less than the threshold for 5 consecutive measurements.
IWM-LR3 - IWM-LR4 User Manual v1.0
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Specication
Versions
IWM-LR3 - IWM-LR4 LoRaWAN modules
Operations
Operating temperature 1°C to +55°C
Connectivity
Network
Frequency bands
Provisioning
Security
Algorithms
Hardware
Battery life
Battery life length
Primary cell
Capacity
Method
Meter readout
Weight
Weight
Conguration
Transmission intervals
Starting value
LoRaWAN
868 MHz
OTAA (default) & ABP (on request)
AES-128
Cryptographic co-processor
max. 10 years* (at 12-hour intervals, at SF12)
Lithium-Manganese 3.0V
2.4 Ah
Inductive
124 g (LR3); 167 g (LR4)
12 hours, configurable via NFC Configurable
Over the air and via NFC
Unique App EUI available upon request
Alarm functions
1. Module removal
2. Magnetic fraud attempt
3. Leak detection
4. Low battery
5. Reverse flow
6. Sensor fraud
Enclosure
IP68
Certications
CE
LoRaWAN
*The battery life strongly depends on the working time window, set during the configuration process, and on the environmental conditions.
IWM-LR3 - IWM-LR4 8User Manual v1.0
Protocol
The protocol consists of different types of data
- LoRaWAN v.1.0.1 standard commands
- Unsolicited uplink status commands during congure state
- Periodic measurement reports
- Downlink commands and queries
- Uplink query response
Note 0x denotion means hexadecimal encoded.
Payload description
The payload is made up of a total of 13 bytes (15 bytes if temperature control is enabled):
Where by absolute value of the counters is meant: ABS (Direct flow counter - Reverse flow counter)
Application code 44
Absolute value of the counters (byte 1/4) XX
Absolute value of the counters (byte 2/4) XX
Absolute value of the counters (byte 3/4) XX
Absolute value of the counters (byte 4/4) XX
Reverse flow counter (byte 1/4) YY
Reverse flow counter (byte 2/4) YY
Reverse flow counter (byte 3/4) YY
Reverse flow counter (byte 4/4) YY
Index K KK
Medium MM
VIF VV
Alarms LL
Temperature (byte 1/2) TT
Temperature (byte 2/2) TT
IWM-LR3 - IWM-LR4 User Manual v1.0
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Vif and management of counters
If the index K = 1 (liters) [where K=1 means CPR-M3-I, GMDM-I, GMB-RP-I, GMB-I; K=10 WDE-K50 up to DN125
included; K=100 WDE-K50 DN150 and DN200], the initial value of VIF = 0x13 (liters) is considered. If the meter
exceeds the maximum number of countable liters (99.999.999), the counter is incremented and not reset
(100,000,000 liters) and the new counting value will be 10,000,000 decaliters with VIF = 0x14 (decaliters).
Consequently, the counter will be increased by one unit every 10 turns of the target.
If the index K = 10 (liters), the initial value of VIF = 0x14 (decaliters) is considered. If the meter exceeds
the maximum number of countable decaliters (99.999.999), the counter is increased and not reset to zero
(100,000,000 decalitres) and the new count value will be 10,000,000 hectoliters with VIF = 0x15 (hectoliters). If
K = 100 (liters) I transmit with VIF = 0x15 (hectoliters) and then use VIF = 0x16 (m3) at the time of the counter
overflow.
In the case of further overflows, the VIF is decreased by a size and the counter reset to 0.
Alarm byte coding
Bit 0: Magnetic
Bit 1: Removal
Bit 2: Sensor fraud
Bit 3: Leakage
Bit 4: Reverse flow
Bit 5: Low battery
Temperature byte coding (extra)
Temperature reading can be enabled with a 0x26 SET_ALARM_PAR command (NFC or LORA). The parameter
is in the most signicant byte of block 6A of the EEPROM.
Eg. 26 00 00 00 09 04 00 00 00 01 00 00 00 00 → Enable
Eg. 26 00 00 00 09 04 00 00 00 00 00 00 00 00 →Disable
N.B: Pay attention to the meaning of the other parameters (for example the last 4 bytes are the low battery
threshold). Refer to the supplement ‘integrators’ document: request it directly from B METERS.
In the payload with Temperature parameter enabled there are at the bottom two additional bytes that indicate
the temperature. Refer to the example below.
Eg. 01 1b (HEX) means 283 (decimal) which, like the rest of the elds by convention, must be interpreted as
28.3 (therefore +28.3° C).
The negative temperature value is indicated by the most signicant bit at 1 of the rst (from left to right) of
the two bytes that give the temperature value (0x80 in the example below). The remaining 15 bits indicate the
absolute value.
Eg. 80 be (HEX) →be → 19 (decimal) so –19° C
IWM-LR3 - IWM-LR4 10 User Manual v1.0
Payload example
Payload example description
Application code 44 44
Absolute value of the counters (byte 1/4) XX 74
Absolute value of the counters (byte 2/4) XX 20
Absolute value of the counters (byte 3/4) XX 01
Absolute value of the counters (byte 4/4) XX 00
Reverseowcounter(byte1/4) YY 34
Reverseowcounter(byte2/4) YY 01
Reverseowcounter(byte3/4) YY 00
Reverseowcounter(byte4/4) YY 00
Index K KK 00
Medium MM 00
VIF VV 13
Alarms LL 02
Temperature (byte 1/2) TT 00
Temperature (byte 2/2) TT 14
44 74200100 34010000 00 00 13 02 00 14
Application code 44
Absolute value 00012074, formally these are 12074 liters
Reverseow 00000134 so 134 liters
Index 0 (1 liter)
Medium 0 (water)
VIF 13 (liters)
Alarms (0x02) = Module removed
Temperature 00 14 (hex) is 20 (decimal) so +2,0°C
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