S0 sensor

 

 

Declaration of conformity

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Download the declaration of conformity

Presentation

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The S0 sensor is a LoRaWAN class A sensor that uses a disposable 1/2 A 3.6V battery as power supply. It also includes an internal antenna.

The pulse input is actually a cable with two separate wires: brown and white.

The level or a counter can be reported on the pulse input. It is also possible to get the voltage of the power supply.

Family code

The family code of S0 devices is: 50-70-001-xxx

Electronic input/output

The schematic of the input of the S0 sensor is illustrated below:

Electrical schematic example for inputs

 

Installation and operation

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Installation

The housing is intended to be installed inside or outside a building but it must be protected from vertical water spray and direct sunlight.

The brown wire has to be connected to the ground and the white one to the pulse generator output.

Instructions on fixing screws

Radio propagation

In order for the sensor to operate correctly, the number of obstacles should be limited in order to avoid excessive radio wave attenuation. It is also important to place the sensor as high as possible.

Autonomy

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The information in the table below represents how long the battery can last. It is based on the default configuration at ambient temperature (+25°C) within the optimal operating range of the sensor via a LoRaWAN network (one uplink frame), when the spreading factor used is SF12.

The disposable battery has a 3.6Ah capacity, of which 85% is used.

Transmission periodicity	Battery life
1 frame/ 24 hours	+15 years

Human Machine Interface

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This device can be switched ON and OFF via a small switch accessible from the top of the electronic board. Set the switch ON. This switch can be seen in the illustration below:

There are two LEDs on the S0 device:

ASSO:      blinking until the association with a network is done.

CONF:     blinking in configuration mode.

• A reset button is available to reboot the sensor.
• A user button is available to enter the configuration mode. "Void" frames are then sent every minute for 10 minutes.

Standard reports are disabled in this mode.

Configuration mode
Way to trigger it	One press on the USER button or specific ZCL command
Way to stop it	Another press on the USER button or specific ZCL command
Effects on the sensor	The CONF led (red) blinks (3 sec. OFF, 3 sec. ON) and the sensor sends an uplink frame every minute. The blinking is illustrated below this table.
Duration	The configuration mode lasts 10 minutes when it is triggered by pressing the USER button

• A reassociation procedure can be requested if no downlink frame is received by the sensor during a given periodicity (4 days by default) or if a given number (100 by default) is reached or in case of failure (no acknowledgement received) by sending an applicative frame to the sensor or via the sensor’s IHM.

The sensor keeps the AppEUi and DevAddr configured, Confirmed/Unconfirmed configuration and all applicative configurations. However, LoRaWAN configurations (channel, data rate…) are lost.

ReAssociation Mode
Way to trigger it	Three short presses on the USER button or ZCL command from LoRaWAN cluster.
Effects on the sensor	The ASSO LED (green) blinks as the “no commissioned sensor” LED is lit.

• A factory reset is available on Watteco’s sensors. It deletes all the applicative settings saved in the flash memory (i.e. configured batches and reports will be deleted).

The sensor keeps the AppEUi and DevAddr configured. However, LoRaWAN configurations (channel, data rate…) and applicative configurations are lost.

Factory reset
Way to trigger it	Two short presses and one long press for approximately 7 seconds on the USER button.
Effects on the sensor	The CONF LED (red) and ASSO LED (green) blink at the same time briefly. All the applicative settings (for batches and reports) are deleted. The blinking is illustrated below this table.

Applicative layer

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Codecs are available to decode frames: Downloads

The S0 device integrates the following clusters:

Cluster	Cluster name	Managed attributes
0x0000	Basic	All
0x0050	Configuration	All
0x000F	Binary Input	All
0x8004	LoRaWAN	All
0x8005	Multi Binary Inputs	All

Default configuration

A default configuration is set:

• The device reports each day the counter value associated with input 1+/1- (EndPoint 0 / Cluster Binary Input / Attribute Count).

Every change made to the default configuration must comply with the legal duty cycle (for example, the most restrictive in the EU is 0.1%, which corresponds to approximately 1 frame per hour with SF12)

Frame examples

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All frames have to be sent on port 125

Standard report

Report

Report of the present value of the pulse input

 

Report of the current value of the counter of the pulse input

 

Configuration

Configure a standard report on the pulse input

 

Configure a standard report on the binary input counter

 

Batch report

Configuration

•Configure a batch report on binary input counter and voltage battery:

Timestamp and record the pulses counter with a resolution of 1, a value has to be saved at least every 40 minutes or on a rise of 55 pulses. Timestamp and record the battery voltage with a resolution  of 0.2V, a value has to be saved at least every 24 hours. All data have to be concatenated and sent every 24 hours at the most.

→The solution to concatenate several different physical values in the same frame is to use batch reporting.

For the batch, the number of physical measurements that will be sent must be known in order to choose a label for each of them and the size of these labels.

As mentioned in the previous paragraph, we will have only two kinds of measurements to manage, thus two different labels.

Label number	Tag label	Tag size
1 or 2	0/1	1
3 or 4	00/01/11/10	2
5 or 6 or 7 or 8	000/001/010/011/100/101/110/111	3
...	...	...

The tag size to be used for two labels is 1. Label 0 can be used for binary input counter and label 1 for the disposable battery level.

Two frames must be sent to configure this batch.

A counter on pulse Input is the EndPoint 0, Cluster “Binary Input” is 0x000F, and Attribute “Count” is 0x0402.

The battery voltage: Cluster "Configuration" is 0x0050, and attribute "Node power descriptor" is 0x0006.

Applicative payload of the count on input 1+/1-

 

Applicative payload of voltage battery

 

To decode the batch reception, use br_uncompress. Type for binary input counter is U32 (10) and U16 (6)  for the disposable battery power, so the following command must be used:

echo « 26150020e06001d71e0000a0650f » | ./br_uncompress -a 1 0,1,10 1,200,6

Result:
DECOMPRESSION SERIES

cnt: 5   #  Batch counter (from 0 to 7)

263    # Timestamp in seconds of sending of the frame

#Format of data is: Timestamp of Measurement | Label | Value

263 0 45     # Timestamp: 841 s                                   Label 0: counter pulse                          Value: 45

263 1 3000     # Timestamp: 811 s                                Label 1: Disposable battery                 Value: 3.0V