B meters IWM-LR3 Manual de usuario

IWM-LR3 - IWM-LR4 User Manual v1.0

This manual offers a simple guide for getting started with the module, as well as conguration 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.

• Theproductshouldnotbeexposedtoextremeheatoropename.

• 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, Congure and Operational state.

Start-up Sequence

When the device has joined the network, startup transmissions are performed to make it easier to congure

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 conguration

commands during 2 minutes

Reset

(OTA or NFC)

IWM-LR3 - IWM-LR4 User Manual v1.0

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. Vericationofthemodulejoinprocedurecompletion

1. Module provisioning – Activation on the network

Standard devices are congured as OTAA (Over The Air Activation). It is possible to order a batch of devices

congured as ABP (Activation By Personalization).

Standard devices are congured with the AppEUI (a.k.a. JoinEUI) E41E0A90000FFFFF. It is possible to order a

batch of devices congured 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 identication 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 congured 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

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. Verication of the module join procedure completion

Verify on the network server that the module has joined correctly.

If you require further support, please contact [email protected] or your local distributor.

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

Specication

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

Conguration

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

Certications

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 congure 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

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 signicant 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 signicant 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

Reverseowcounter(byte1/4) YY 34

Reverseowcounter(byte2/4) YY 01

Reverseowcounter(byte3/4) YY 00

Reverseowcounter(byte4/4) 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

Reverseow 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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