Remote temperature sensor

 

Declaration of conformity


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Presentation


The Remote temperature sensor is a LoRaWAN class A sensor that manages two different power supplies: one is external and may range from 9V to 24V, the other one is internal on the battery. It also incorporates an internal antenna.

The sensor includes a 5-metre temperature probe.

remote_temperature

The Remote temperature sensor allows the measurement of temperature over a wide range of values. It can measure from -40°C to +90°C with a precision of 1°C.

The table below shows the precision for each range of temperatures:

Temperature rangePrecision
[-40°C ; -34°C]+/-1.5°C
[-33°C ; +9°C]+/-1.0°C
[+10°C ; +37°C] +/-0.5°C
[+38°C ; +64°C]+/-1.0°C
[+65°C ; +82°C]+/-1.5°C
[+83°C ; +90°C]+/-2.0°C

The measurement step is defined in the minimum field of a frame.

The housing is compatible with the following DIN rail adapter:

din

For more information about the casing, please visit: www.spelsberg.com

Family code:

The family code of Remote temperature devices is: 50-70-043-xxx

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. The cable gland should be positioned downward.

propagation-radio-pulse

Autonomy


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 periodicityBattery life
1 frame/ 2 hours12 years

Human Machine Interface


The Remote temperature sensor has a buzzer that allows it to “communicate” with the user.

Once the device is installed, switch the power ON to start up the device. The buzzer rings until an association is made.

When the sensor is trying to associate with a network, it emits the following sound:

Once the association is completed, the buzzer makes the following sound:

A reed switch (or magnetic switch) is available. A magnet can be used to activate it and perform specific actions on the sensor (switch off, switch on, reassociation…).

  • Configuration: « void » frames are sent every minute for 10 minutes.

Standard reports are disabled in this mode.

Configuration mode
Way to trigger itOne passage of the magnet near the reed switch or specific ZCL command
Way to stop it Another passage of the magnet or specific ZCL command
Effects on the sensor
DurationThe configuration mode lasts 10 minutes
  • 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 itThree passages of the magnet near the reed switch or ZCL command from LoRaWAN cluster.
Effects on the sensor
  • A factory reset is available on nke 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 itTwo quick passages and a very long passage (until the sensor rings for the reset) of the magnet near the reed switch
Effects on the sensor

Applicative layer


Codecs are available to decode frames: Downloads

The Remote temperature sensor integrates the following clusters:

ClusterCluster nameManaged attributes
0x0000BasicAll
0x0050ConfigurationAll
0x8004LoRaWANAll
0x0402Temperature MeasurementAll

Default configuration

A default configuration is set:

  • The device reports the temperature every 2 hours (EndPoint 0 / Cluster Temperature Measurement / Attribute Measuredvalue).

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)

Measurement periodicity

The measurement periodicity depends on the minimum and maximum recording intervals, and the delta.

If the value of the minimum and the delta is 0, then the maximum value is the periodicity. However, if the value of delta is different than 0, then the periodicity is 1 second.

If the value of the minimum is different than 0, then this value is the same as the periodicity.

Frame examples


All frames have to be sent on port 125

Standard report

Report

 

Report of the temperature of the remote sensor

→ Applicative payload is: 11 0a 04 02 00 00 29 00 64

 00 64: Measured value 1°C (Temperature (°C) = Measured value/100)

 

Configuration

 

Configure a standard report on the temperature

Report immediately the temperature for every 11°C of variation. This measurement has to be reported at least every hour.

→The temperature is on the EndPoint 0, Cluster “Temperature Measurement” is 0x0402, Attribute “MeasuredValue” is 0x0000.

The maximum field has to be 0x0e10 to have a report every one hour and the minimum field has to be 0x0000 to have a report immediately after the right variation.

The delta has to be configured to 1100=0x044c for a report every 11°C of variation.

Applicative payload is: 11 06 04 02 00 00 00 29 00 1e 0e 10 04 4c

00 1e:minimum reporting interval (30 seconds)

0e 10: maximum reporting interval (1 hour)

04 4c: reportable change (11°C)

→Response: 11 07 04 02 00 00 00 00

To disable the previous configuration, change the value of the minimum and maximum sending intervals and the delta to 0: 11 06 04 02 00 00 00 29 00 00 00 00 00 00

 

Batch report

• Configure a batch report on Temperature and Battery voltage:

Timestamp and record the temperature with a resolution of 0.1°C, a value has to be saved at least every 6 hours or on a variation of 1°C.

Timestamp and record all power source voltages with a resolution of 0.1V, 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. There is only 1 power source in the sensor (disposable battery). So with the temperature and this power source, it is necessary to manage 2 different labels.

Label numberTag labelTag size
1 or 20/11
3 or 400/01/11/102
5 or 6 or 7 or 8000/001/010/011/100/101/110/1113
.........

The Tag Size to use for 2 labels is 1. Label 0 can be used for Temperature and Label 1 for level of Disposable Battery. To configure the batch, a command “Configure reporting” must be sent for each cluster.

For temperature, the delta has to be set to 100=0x0064 (1°C), minimum to 30=0x001e (30 seconds), the maximum to 6*60=360=0x8168 (6 hours), the resolution to 10=0x000A (0.1°C) and the tag to 0b00000001=0x01 (size 1 and label 0). The cluster to report is 0x0402 and the attribute 0x0000 (MeasuredValue).

For Disposable Battery power source the delta has to be set to 200=0x00c8 (0.2V), minimum to 10=0x800a (10 minutes), the maximum to 24*60=1440=0x85A0 (24 hours), the resolution to 200=0x0064 (0.1V), the tag to 0b00001001=0x0a (size 1 and label 1), the field to 4=0x04. The cluster to report is 0x0050 and the attribute 0x0006 (Node power descriptor).

Power sources (Bits field)Description
0x01Constant (main) or External power
0x02Rechargeable battery
0x04Diposable battery
0x08Solar harvesting
0x10TIC harvesting
OthersReserved
0x00Undefined: should not occur

Applicative payload of the temperature

11 06 04 02 15 00 00 00 00 1e 81 68 00 64 00 0A 01

15:  0b00010101 => 0001010: size of configuration string after attribute ID (10 bytes)

00 1e: minimum reporting interval (30 seconds)

81 68: maximum reporting interval (6 hours)

00 64: required delta value (size: 2 bytes for attribute MeasuredValue => attribute type = 29; 1°C)

00 0A: required resolution (0.1°C)

01: tag value (ob00000001 => 00000: tag label, 001: tag size)

→Response: 11 07 04 02 00 01 00 00

 

Applicative payload of the battery voltage

11 06 00 50 29 00 06 04 80 0a 85 a0 00 c8 00 64 09

29: 0b00101001 => 0010100: size of configuration string after attribute ID (20 bytes)

04: index of required field (Rechargeable battery)

80 0a: minimum reporting interval (10 minutes)

85 a0: maximum reporting interval (24 hours)

00 c8: required delta value (size: 2 bytes for attribute NodePowerDescriptor => attribute type = 41; 0.2V)

00 64: required resolution (0.1V)

09tag value (ob00001001 => 00001: tag label, 001: tag size)

→Response: 11 07 00 50 00 01 00 06

 

To decode the batch reception, use br_uncompress. Type for Temperature is I16 (7) and for others the type is U16 (6), so the following command must be used:

echo « 200200606025410d271ce80441ff9d230083ff6787f5b30f68b72cef9228 » | br_uncompress -a 1 0,10,7  1,100,6

Result

DECOMPRESSION SERIES

cnt: 2   # Batch counter (from 0 to 7)

18450  # Timestamp in seconds of sending of the frame

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

811 0 2410    # Timestamp: 811 s     Label 0: Temperature                   Value: 24,1°C

841 0 2550   # Timestamp: 841 s     Label 0: Temperature                    Value: 25.5°C

911 0 -1250   # Timestamp: 911 s     Label 0: Temperature                    Value:-12.5°C

941 0 -1370   # Timestamp: 941 s     Label 0: Temperature                    Value:-13.7°C

12011 0 -1230  # Timestamp: 12011 s     Label 0: Temperature                    Value:-12.3°C

844 1 3700  # Timestamp: 840 s      Label 1: Disposable battery            Value: 3.7V

1444 1 3500  # Timestamp: 840 s      Label 1: Disposable battery            Value: 3.5V

 

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