Nokeval Stable-LWEU-T-DI User manual

ID11554 V14 20.7.2021
Firmware 1.0-1.0
Stable-LWEU-T-DI
Manual

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Contents
Introduction .....................................................................................................................................................2
Installation .......................................................................................................................................................3
Operation.........................................................................................................................................................5
LoRaWAN settings............................................................................................................................................6
Uplink payload structure..................................................................................................................................6
Maintenance ................................................................................................................................................. 10
Specifications ................................................................................................................................................ 10
Warnings ....................................................................................................................................................... 12
Manufacturer................................................................................................................................................ 12
Declaration of conformity............................................................................................................................. 13
Introduction
The Stable-LWEU-T-DI is a temperature transmitter. The device measures temperature using two
thermocouples. Stable-LWEU-T-DI uses LoRaWAN for communication with the cloud.
Before using the 868 MHz radio, make sure it is legal in your country.

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Installation
Mounting
Mount the device to wall or another suitable vertical surface. Mounting position, cable outlets downward.
•Open the lids with flat screwdriver.
•Mount device with pan head screw, ø4.2mm max., length 10mm min.
•Close the lids.

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Power supplies
The Stable-LWEU-T-DI is powered with a 3.6V Lithium Thionyl battery pack.
The device is supplied with batteries already installed, so it is ready to be used.
Settings
The Stable-LWEU-T-DI works with its default settings and no parameter configuration is normally
required. However, if it is necessary to change the settings of the device, it can be done with Nokeval’s
MekuWin software (available for free at www.nokeval.com). Following procedure should be followed in
order to get access to the settings:
•Open the enclosure by removing the 6 screws.
•Connect a micro-USB cable to the connector, and the other end of the cable to a computer.
•If Windows requests for a driver, download it at www.nokeval.com > Support, unzip it to a
temporary folder, and show that directory as the location for the driver. If there are problems
during the installation, try pushing the button every 5-15 seconds or keeping it pressed so that
the Stable-LWEU-T-DI will not shut down its USB port.
•Launch the MekuWin program.
•In MekuWin, choose the right COM-port form the Ports-menu. If the port is not visible, try
pushing the button on the Stable-LWEU-T-DI to wake up the port.
•From the Port settings -menu, choose Protocol = ModbusRTU, Address = 1.
•Click Direct.
•A new window will open for the settings.
The configuration menu includes the following settings:
•Protection
oDescribes password protection status “None”, “Locked”, “Unlocked”.
•Password input/setup
oUnlock protection or change password. See “Protecting the settings” section below for
details.
•Transmission Period
oTime between transmissions with options from ranging 5 minutes to 6 hours. Default is 30
min.
•Trigger high temperature
oTemperature measurement value which triggers an alarm state with more frequent
transmissions (same interval as Measurement Period).
•Measurement Period
oTime between measurements with options ranging from 1 minute to 1 hour. Default is 2
minutes. The measurements are transmitted only if above Trigger high temperature, or if
a digital input has changed.
•Digital inputs enabled
oIf enabled, all 3 digital inputs are measured, and a transmission is done when one of their
states changes. If disabled, none of the digital inputs are measured.
•Pt100 wire select status
oDisplay status, jumper is used this reads e.g. “Jumper selected 3-wire”. If jumper is not
used to select the wiring type, it reads “Menu selected wires”.
•Pt100 wire select
oPt100 wiring selection: 2-wire, 3-wire, or 4-wire. Only applicable if the above status is
“Menu selected wires”
•LoRaWAN

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oIf the Stable-LWEU-T-DI is used with the Nokeval cloud platform, the default settings are
ok. If you wish to manually set the LoRaWAN credentials and/or integrate it with your
cloud platform, see “LoRaWAN settings” and “Uplink payload structure” chapters.
Protecting the settings
To protect the settings from being easily adjusted, the configuration menu provides a password box. The
password can be formed using up to 16 characters. From the next MekuWin session, the settings can’t be
adjusted without knowing the password.
If the displayed status is “Locked”, changes will not be saved to the device. Write the correct password in
the “Password input” field and press enter to unlock.
If displayed status is “Unlocked”, the settings and password can be changed and the menu will become
locked again after menu is closed.
Note that the password cannot be reset by the user. If the password is forgotten, the password reset can
only be made by the manufacturer. Please make sure that the password is remembered if changed.
Operation
After the Stable-LWEU-T-DI is successfully installed, it operates on its own. However, there are some
considerations that are good to know when using the Stable-LWEU-T-DI.
Temperature measurement
Temperatures are given in °C. The device supports, 2-wire, 3-wire and 4-wire Pt100 measurements,
selection is described in the Settings section.
Transmissions become more frequent when temperature result is above the “Trigger high temperature”
value as described in the Settings section.
Digital inputs
The device has 3 digital input ports, on the spring connector next to the “Digital inputs” text on the PCB.
The first 3 from the left are the inputs, and the rightmost port on the connector is ground.
The inputs are read every measurement period (default 2 minutes), and a transmission is triggered if any
of the input values have changed after the previous reading.
Monitor menu
In MekuWin Mon-menu, you can monitor the measurement readings. The sensors are kept continuously
on while MekuWin is open. The values update at the rate the sensor can produce new readings.
Information about LoRaWAN is also displayed to help with potential connection issues.
Cal menu
The calibration menu settings are only for the manufacturer use. They are not explained in this manual.

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LoRaWAN settings
Conf menu
Quality
•Unidirectional – uplinks are sent as unconfirmed data with 1 attempt. Acknowledgement is not
requested.
•Bidirectional – uplinks are sent as confirmed data. Acknowledgement is requested, and up to 3
attempts are used if acknowledgement is not received.
DevEUI (readonly) – shows the DevEUI of the device. Note that DevEUI can’t be modified.
LoRaWAN credentials
These should be only changed if manually provisioning the device to your own system.
AppKey, AppSKey, NwkSKey: If set, these are displayed as “***” when the menu is re-opened. They can’t
be read from the device afterwards.
The keys and EUI:s are written as hex symbols 0-9/A-F, 4 bits per symbol.
•OTAA - Activation mode. If toggled on, Over-the-air-activation is used, else Activation by
personalization is used.
•(OTAA mode only) AppEUI – 16 hex symbols
•(OTAA mode only) AppKey – 32 hex symbols
•(ABP mode only) DevAddr – 8 hex symbols
•(ABP mode only) AppSKey - 32 hex symbols
•(ABP mode only) NwkSKey - 32 hex symbols
Other LoRaWAN details
The device always uses Adaptive Data Rate. If it receives no messages from server for 2 subsequent
messages, it will lower data rate by 1 step. Then it will lower the data rate by 1 step after every 2
messages until a message is received or data rate 0 is reached. When the device is connected to server,
the MAC layer controls the data rate.
Uplink payload structure
This information is only relevant for integrating the Stable-LWEU-T-DI with customer’s own cloud
platform.
The payload data format consists of a protocol version field and 1 or more messages in length-type-data
format. Example payloads are presented at the end of this section for reference.
Size
Name
Meaning
1B
Protocol version
Version=1
XB
1 or more messages
Messages in format presented below.

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Message format:
Size
Name
Meaning
1B
Message length
Bits 0:6 - Message length in bytes, excluding length
field and optional age field.
Bit 7: If 1, age field is included.
(2B)
Optional age field
Age, uint16 * 60 seconds
1B
Message type
Type, e.g. 11 = Flagged utility
XB
Message data
Data based on message type
Message types
Message types:
•10 Formatted measurement data
•11 Flagged utility
•12 Debug
The device may send other message types but those should be ignored. Start of next record can be found
based on the length field at start of every message.
Type 10: Measurement data
Measurement data using bit-flags to describe which measurement fields are included. If the device failed
to measure a value, that field will be missing. The format additionally contains status information bitflags
field and related to measurements after the measurement data section.
After measurement data, has status bitflags field describing which status fields are included, similarly to
the measurement bitflags. Generally if the device failed to produce a measurement, it will have a status
code to help identify the issue.
Size
Name
Value/Meaning
2B
Measurement format
Always 4.
1B
Measurement flags
Tells which of the measurement fields are included.
E.g. 0000 1111 = All 4 fields
0000 0101 = Temperature 1, internal temperature
3B
0 – Temperature Pt100
Conversion: int24/100 (oC)
3B
1 – Reserved
--
2B
2 – Internal temperature
int16/100 (oC)
1B
3 – Digital inputs x4
One bit per digital input
bit 0 – DI1 (least significant bit)
bit 1 – DI2
bit 2 – DI3
bit 3 – DI4
1B
3 – Reserved
--
1B
Status flags
Tells which of the measurement status fields are
included. Same logic as Measurement flags field
1B
0 – Temperature 1 status
0: Reserved for future use
1+: error number
1B
1 – Reserved
-||-
1B
2 – Internal temperature
status
-||-
1B
3 – Digital inputs status
-||- (Shared status value for all digital inputs)

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Type 11: Utility
Contains utility information about the device. Uses bit flags to describe which fields are included in the
message, similar to message type 10.
Size
Name
Meaning
1B
Bit flags
If 0x00: Request to send utility.
Otherwise describes which fields are included in the message. E.g.
0100 0001 = device type + serial number
3B
0 – Device type
<0-16777215>, the product number of the device.
2B
1 – Firmware ver
<major 0-255> <minor 0-255>
3B
2 – Firmware build
<0-16777215> Build number to identify FW version more precisely.
3B
3 – Firmware ID
<0-16777215> Firmware identifier, for use with firmware update.
1B
4 – Battery info
<number 0-255>, highest bit describes whether the device has
auxiliary power. Other bits:
0-100 = main battery empty/full (1% resolution),
101-121 = reserve battery empty/full (5% resolution),
126 = battery can’t be measured,
127 = no battery attached
2B
5 – Calibration date
<0-65535> as days after 1.1.2000; 65535 means unknown
XB
6 – Serial number
<symbol> *[1-20], 32-126: Ascii-symbols,
128-227: 2 numbers encoded: ”00”, ”01”, ”02”… ”99”
Type 12: Debug information
Debug information message. These should be skipped when reading.

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Example uplinks
Example 1: measurement and utility message
01 0B 0A 04 00 0D DB 20 00 6C 09 0C 00 09 0B 41 51 4F 00 50 AD CF 81
Bytes (hex)
Name
Meaning
01
Protocol version
01 – Version
0B
Message length
Message length 11, excluding length field.
0A
Message type
Type 10 = measurement data
04 00
Measurement format
Always 4
0D
Measurement flags
Which of the measurement fields are included.
0x0D = 0000 1101, meaning fields 0,2,3
DB 20 00
0 – Temperature
Pt100
8411 -> 84.11C
6C 09
2 – Internal
temperature
2412 -> 24.12C
0C
3 – Digital inputs
0C = 0000 1100, meaning digital inputs 3 and 4
are active.
00
Status flags
00 = No errors
09
Message length
Message length 9, excluding length field
0B
Message type
Type 11 = utility
41
Utility bitflags
0x41 = 0100 0001, so fields 0 and 6 are included
51 4F 00
0 - Device type
Dev type 20305
50 AD CF 81
6 – Serial number
Serial number P457901
Example 2: measurement with active statuses
01 09 0A 04 00 04 95 09 09 02 04
Bytes (hex)
Name
Meaning
01
Protocol version
01 – Version
09
Message length
Message length 9, excluding length field.
0A
Message type
Type 10 = measurement data
04 00
Measurement
format
Always 4
04
Measurement flags
Which of the measurement fields are included.
0x04 = 0000 0100, meaning Internal Temperature
only
95 09
2 – Internal
temperature
2453 -> 24.53C
09
Status flags
09 = Temperature pt100 and digital inputs statuses
02
0 – Temperature
pt100 status
Status = 2
04
3 – Digital inputs
status
Status = 4

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Maintenance
Checking the status
The status of the Stable-LWEU-T-DI can be checked by opening the enclosure and pressing the button in
the top-left corner. If the led is solid green, no statuses are active. Otherwise, any statuses are presented
by series of blinks with a short pause between series and a longer pause after all active statuses have
been presented.
•1 blink: connection unknown or connection test in progress (test starts after pressing button)
•2 blinks: no connection (did not receive acknowledgement from server to connection test)
•3 blinks: Pt100 sensor not connected or measurement failed for other reason
•4 blinks: Battery low
Replacing the batteries
•The Stable-LWEU-T-DI is powered with a 3.6V Lithium Thionyl battery pack. The batteries should
not be replaced by the users.
Specifications
Environment
Storage temperature -40…+70°C
Operating temperature -30...+60°C
Protection class IP67
Enclosure material UV-resistant ASA plastic
Measurements
Weight 250g with batteries
Dimensions 151 x 90 x 40 mm

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Power supply
Batteries 3.6V Lithium Thionyl battery pack (3 x AA size)
Typical battery life 10 years with 1 hour transmission interval and 2 minutes measurement interval
Measuring and data transmission
Transmission Interval Configurable: 5min / 10min / 15min /20min / 30min / 1h / 2h / 3h / 4h / 6h
Measurement Interval Configurable: 1/2/3/4/5/10/15/20/25/30/45/60 min
Radio LoRa radio technology with Murata ABZ-093 LoRaWAN modem.
Antenna Internal
Frequency band 863-870 MHz (LoRaWAN 1.0.2 EU band)
Transmission power Max +14 dBm E.R.P.
Range, line-of-sight Depends on installation location and environment, in good conditions 10 km
Temperature measurement (Pt100)
Sensor Pt100
Measurement range -200…+650°C
Accuracy Accuracy 0.05% rdg + 0.2 °C at 25 °C ambient
Thermal drift 0.01 °C/°C
Cable length <30 m
Temperature measurement (Internal)
Measurement range -40°C .. +125°C
Accuracy Typically ±0.5°C
Digital inputs
Inputs 3 digital inputs

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Warnings
The device must not be disposed in household waste. Observe local regulations concerning
the disposal of electrical waste. The device may contain a battery.
.
Manufacturer
Nokeval Oy
Rounionkatu 107
FI-37150 Nokia
Phone [phone] (Mon-Fri 8:30-16:00 EET)
WWW http://www.nokeval.com/
Email [e-mail]

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Declaration of conformity