Vega Absolute M-BUS-2 User manual

www.vega-absolute.ru
LORAWAN CONVERTER
M-BUS-2
USER MANUAL
DOCUMENT REVISION
FIRMWARE VERSION
10 2.3

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CONTENTS
INTRODUCTION.........................................................................................................................................................................3
1 DESCRIPTION AND OPERATION ......................................................................................................................................... 4
Device description ................................................................................................................................................................. 4
Work algorithm ....................................................................................................................................................................... 4
Functional ................................................................................................................................................................................ 6
Marking.....................................................................................................................................................................................6
2 SPECIFICATION .......................................................................................................................................................................7
Device specification............................................................................................................................................................... 7
Default device settings .......................................................................................................................................................... 8
3 OPERATION.............................................................................................................................................................................. 9
Device appearance.................................................................................................................................................................9
Contacts .................................................................................................................................................................................10
Led indication........................................................................................................................................................................10
Mounting recomendations.................................................................................................................................................11
Converter operation in the independent poll mode of the metering devices ........................................................14
Converter operation in the universal poll mode............................................................................................................14
4 COMMUNICATION PROTOCOL – 1.1 VERSION.............................................................................................................15
Converter M-BUS-2 transmits the following types of packets ...................................................................................15
1. Packet with current readings from connected heat meter ...................................................................................15
2. Packet with data from connected M-BUS device in universal poll mode........................................................... 16
3. Packet with time correction request..........................................................................................................................16
4. Settings packet............................................................................................................................................................... 17
Converter M-BUS-2 receives packets of the following types .....................................................................................18
1. Real-time clock adjustment ........................................................................................................................................ 18
2. Packet with request of settings................................................................................................................................... 18
3. Packet with settings is identical to such packet from device ................................................................................18
5 STORAGE AND TRANSPORTATION REQUIREMENTS ...................................................................................................20
6 CONTENT OF THE PACKAGE .............................................................................................................................................21
7 WARRANTY ............................................................................................................................................................................. 22

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INTRODUCTION
This manual is designated for M-BUS-2 device (hereinafter – device, converter)
manufactured by Vega-Absolute OOO and provides information on powering and activation
procedure, control commands and functions of the device.
This manual is targeted at specialists familiar with installation work fundamentals for
electronic and electrical equipment.
Vega-Absolute OOO reserves the right to make changes to the manual related to the
improvement of equipment and software, as well as to eliminate typos and inaccuracies,
without prior notice.

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1 DESCRIPTION AND OPERATION
DEVICE DESCRIPTION
The device M-BUS-2 is designed for reading of values from metering instruments via M-
BUS interface and further accumulating and transmitting of this data to the LoRaWAN®network.
The converter is powered by a 6400 mAh built-in battery.
Converter M-BUS may operate in the independent poll mode of the metering devices
converter only with the next supported devices:
•Heat meter «Teplouchet-1»
•Heat meter «STE 21 «Berill»
•Heat meter «ELF-M Teplovodomer»
•Heat meter Landis Gyr T230
•Heat meter Sharky 775
•Heat meter Pulsar
•Heat meter Calec ST II
•Heat meter Calec ST II_2
•Heat meter Sensonic II
•Heat calculator ZENNER_MULTIDATA_WR3
•Heat meter “Pulse STK-15”
•Heat meter “Hiterm PUTM-1”
The list of supported metering devices depends on the firmware version, therefore, the
issue of support for a specific device should be specified when ordering.
Starting with firmware 2.0 and higher, different types of metering devices
can be connected to one converter
The converter is configured via USB using the special «Vega LoRaWAN Configurator»
software.
WORK ALGORITHM
Vega M-BUS-2 operates in the following modes:
«Storage» — it is a mode for storage and transportation. In this mode, the device does
not regularly transmit data to the network.
«Active» - device operating mode.
Before starting to use the converter, it is necessary to take out of the «Storage» mode.

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Vega M-BUS-2 device supports two activation methods in the LoRaWAN®network - ABP
and OTAA. One of the methods can be chosen using the «Vega LoRaWAN Configurator»
application (see the "User Manual" for the program).
Method ABP. After pressing the start button, the device immediately starts working in the
«Active» mode.
Method OTAA.After pressing the start button, the device will make three attempts to
connect to the network in the frequency plan specified when setting up. Upon receipt of
confirmation of activation in the LoRaWAN®network, the device will give a signal by the
indicator (glow for 5 seconds) and go into the «Active» mode. If all attempts are unsuccessful,
the counter will continue to accumulate data and will try to connect to the network every 6
hours.
It is possible to transfer the device from the "Active" mode back to the "Storage" mode
without disconnecting the power supply (battery or external) by long pressing the start button
(more than 5 seconds).
The device generates a packet with the current state with a configurable period from 5
minutes to 24 hours. Packets are saved in the device memory and are transmitted during the
next session of communication with the LoRaWAN®network.
Example
If the data collection period is 24 hours, then the package will be generated at 00.00
according to the internal clock of the device.
If the data collection period is 12 hours, then at 00.00 and at 12.00, and so on.
The data transfer period can be adjusted from 5 minutes to 24 hours. When
communicating, the device starts sending packets with readings, starting with the earliest one.
The specific data transfer time cannot be set, it is determined randomly for each device within
the selected data transfer period from the moment of connecting to the network.
Example
The data transfer period is set to 30 minutes, and the device was started at 16:40
according to the device's internal clock. At random counting, the device was assigned the time
16:41 to transmit a packet in a half-hour period from 16:40 to 17:10. Thus, packets from this
device will be transmitted at 16:41, 17:11, 17:41, 18:11, and so on every 30 minutes according to
the internal clock of the device..
The internal clock is set automatically when connected to the device via USB, and can
also be adjusted via the LoRaWAN®network.

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FUNCTIONAL
M-BUS-2 converter is A class device (LoRaWAN®classification) and has the following
features:
ADR support (Adaptive Data Rate)
Sending of confirmed packets (configurable)
Temperature measurement by the internal temperature sensor
Charge measuring of the built-in battery (%)
MARKING
Device marked with sticker that contain the next information:
Device model;
DevEUI;
Month and year of manufacture.
Sticker located in three places – on device case, in factory certificate and on the packing
box.
Besides, there is an additional sticker located on the packing box and contains:
Information about firmware version;
QR code containing activation keys for the device in the LoRaWAN®network and
other identifiers.

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2 SPECIFICATION
DEVICE SPECIFICATION
MAIN
M-BUS interface 1
Quantity of connecting M-BUS devices up to 10
USB-port mini-USB, type B
Operating temperatures -40…+85 °С
LoRaWAN®
LoRaWAN®class A
Quantity of LoRa channels 16
Default frequency plans
RU868, EU868, KZ865, custom
(EU868 based)
Frequency plans available on request IN865, AS923, AU915, KR920,
US915
Activation type ABP и OTAA
Communication period 5, 15, 30 minutes, 1, 6, 12 or 24
hours
Data collection period 5, 15, 30 minutes, 1, 6, 12 or 24
hours
Memory amount for storing packets 100 packets
Antenna connector SMA
Sensitivity -138 dBm
Radio coverage in restrained urban conditions max 5 km
Radio coverage within line of sight max 15 km
Transmitter power by default 25 mW (configurable)
POWER
Built-in battery 6400 mAh
Calculated number of packets sent by the device,
not less 15 000
CASE
Housing dimensions, no more than 104 х 95 х 29 mm
Ingress protection rating IP54
Mounting With screws
PACKAGE
Dimensions 152 х 123 х 38 mm
Weight 0,310 kg

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DEFAULT DEVICE SETTINGS
PARAMETER
VALUE
Frequency plan RU868
Activation type ABP or OTAA
Adaptive Data Rate (ADR) ON
Confirmed Uplinks OFF
Rx 1 delay 1 second
Join accept delay
5 seconds
Uplink number of transmissions 1
Data rate DR0
Power 14 dBm
Communication period 24 hours
Data collection period 24 hours
Time zone UTC +00:00
For changing the device settings, you need to connect to it with “Vega LoRaWAN
Configurator” application. You can download app on the iotvega.com site in SOFT section as
well as User Manual for configurator. Go to the app page.

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3 OPERATION
DEVICE APPEARANCE
Vega M-BUS-2 is represented in black plastic case screwed together.
1 – screws ø 3 mm х
2 – input of external antenna
3 – harness connector included
4 – screw fastening
All control and indication elements are located inside the case on the board.
1
2
6 9
8
7
5 – led indicator
6 – power connectors
7 – USB-port
8 – start button
9 – SMA connector for an
external LoRaWAN antenna
connection
3
4
5

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CONTACTS
Converter has 12 contact pairs which are M-BUS interfaces. Converter provide
connection up to 10 M-BUS devices. You can choose any 10 of 12 contact pairs. Wherein 1-2
contacts are M-BUS- (bot row), and 13-24 contacts are M-BUS+ (top row).
In order to increase the battery life, the physical level of the M-BUS interface is switch on
(supply voltage is applied to the outputs MBAS +, MBAS-) just before meter polling with a
programmable delay (the delay value is depends on the type of connected meter). The delay is
introduced for initializing own meter interface and its preparing for receiving data from the
converter. When the polling is complete, the physical M-BUS level is turned off.
LED INDICATION
There is one red LED on the board. The indication in only used when the device is
activated in the LoRaWAN® network and when the operating modes are changed.
LED on the board

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LED SIGNAL
MEANING
Short flashlights Linking to the network in progress
One long flashing
during 5 sec
The device has been successfully
connected to the network and is in
active mode
Three flashing each by
1 sec
Linking to the network has been failed
or the device switched to the
«Storage» mode
In case of connection attempt fail, the device will continue to accumulate
data and will attempt to connect to the network every 6 hours
MOUNTING RECOMENDATIONS
To provide the stable radio between the gateway and the device it is recommended
avoiding the device installation in the places which are barriers for the radio signal getting
through like a reinforced floors and walls, a basement, an underground facilities and wells, a
metal case etc.
The necessary stage for the network deploying including a big quantity of end devices is
a radio planning work with nature experiments.
Before starting mounting, make sure that the device has the latest
firmware version
For mounting you will need:
cross-shaped screwdriver
wire stripper;
laptop.
Step by step mounting be like:
1. Setting the devices and connecting them to the network are usually carried out in the
office (see Network Deployment Manual).
2. Determination of suitable places for mounting at the object with a network tester.

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3. De-energizing the connected equipment, metering devices, etc.
4. Stripping wires in a bundle and connecting external equipment to them.
5. Connecting all necessary wires to the M-BUS-2 contacts.
6. M-BUS-2 converter uses an external antenna for operation. It must be connected to
the dedicated connector on the device board and lead out the wire through a special
groove in the case.
7. M-BUS-2 converter can be powered from built-in battery. For working with battery it
is necessary to connect it to battery connector on the board.
.
Power connectors
SMA connector for
an external
LoRaWAN antenna
connection

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8. When the power is connected at the first time the device automatically switches to
the “Active” mode and starts registration in the network. But if the device with
connected battery or an external power has been switched to the “Storage” mode
(by pressing on the start button more than 5 sec) than you need to press the button
to start.
9. By the laptop make sure that the device successfully sends the data.
10. Assembling the device. It is necessary to make sure that the silicone gasket is installed
exactly in the groove of the case, the fasteners are tightened sufficiently tightly, the
case cover is tightly adjacent to the counterpart.
11. DIN-rail mounting or another available way to mount the device on the object.
Press the start
button located on
the board

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CONVERTER OPERATION IN THE INDEPENDENT POLL MODE OF THE METERING
DEVICES
In the independent poll mode, the converter periodically and consistently polls the
metering devices at their secondary addresses. The addresses of the polling devices are writting
to the converter using the "Vega LoRaWAN Configurator" application.
In case of a successful poll, the data transferred by the metering device is accumulated
in the configurator memory and sent to the LoRaWAN®network in accordance with
communication period. The communication period can be set in the "Vega LoRaWAN
Configurator" application while converter connected to a computer.
CONVERTER OPERATION IN THE UNIVERSAL POLL MODE
To reduce the volume of data transmitted over the air, the user can use the universal
polling mode. In this mode, the converter independently interrogates metering devices with
user-specified commands in accordance with a customizable schedule. This reduces radio
traffic and significantly increases the polling rate of the meter.
In the universal polling mode through configurator the user can set transmitted
commands, progression of their transfer, intervals of transfer, timeout of waiting answer.
Metering device’s answer is packaged in “black box” and in accordance with period of data
transfer. The user can ban to pack of metering device’s answer, if, e.g., the answer on some
command is need not to transfer.
By default, the universal polling mode is disabled, you can activate it using the Vega
LoRaWAN Configurator program on the device tab 1(look at chapter «Vega LoRaWAN
Configurator»).
Activation of the universal poll mode leads to the blocking of independent
polling of supported metering devices
1The described functionality is supported in the Configurator version 1.0.55 and higher.

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4 COMMUNICATION PROTOCOL – 1.1 VERSION
This part describes the M-BUS-2 data exchange protocol with LoRaWAN®network.
In fields consisting of several bytes, the little-endian byte order is used
CONVERTER M-BUS-2 TRANSMITS THE FOLLOWING TYPES OF PACKETS
1. Packet with current readings from connected heat meter
Sent regularly or by request on LoRaWAN®port 2
Size in bytes
Field description
Data type
1 byte Packet type, this packet = 1) uint8
1 byte Battery level, % uint8
1 byte Values of basic settings (bit field) uint8
4 bytes Meter secondary address uint32
4 bytes Time of readings in this packet (unixtime UTC), by the
internal clock of the converter uint32
4 bytes The amount of thermal energy consumed, Wh uint32
4 bytes Total volume of coolant, l uint32
4 bytes Operating time, h uint32
2 bytes
Current flow temperature ⁰С*100
uint16
2 bytes Current temperature in the return line ⁰С*100 uint16
2 bytes Current flow of coolant, l/h uint16
4 bytes Current flow of coolant, l/h uint32
1 byte Environment (water, heat, gas, etc.)* uint8
4 bytes Power, W uint32
*The Environment (medium) field is encoded according to the MBUS protocol (protocol
section 8.4.1 Measured Medium Variable Structure).
The converter has internal clock with a calendar, the time and date on which is factory
set, as well as every time the device is configured via the USB interface. When sending a packet
with the current readings, the device uses the data taken at the nearest time, which is multiple
to the interval, set by the switches:
•1 hour period: the readings of the beginning of the current hour are sent;
•6 hours period: 00:00, 06:00, 12:00, 18:00 readings are sent;
•12 hours period: 00:00, 12:00 readings are sent;
•24 hours period: the readings of 00:00 of the current day are sent.
When transmitting on request the readings are taken in that moment.

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A package of this type is transmitted separately for each connected meter. For example,
if 5 metering devices are connected to the converter, 5 packets will be transferred to the next
connection.
«Values of basic settings» bit field decoding
Bits
Field description
0 bit Activation type 0 - OTAA, 1 – ABP
1 bit Query for packet confirmation 0 – off, 1 – on
2,3,4 bit Communication period:
|1 == 0|2==0|3==0| - 5 minutes
|1 == 1|2==0|3==0| - 15 minutes
|1 == 0|2==1|3==0|- 30 minutes
|1 == 1|2==1 |3==0|- 1 hour
|1 == 0|2==0|3==1|- 6 hours
|1 == 1|2==0|3==1|- 12 hours
|1 == 0|2==1|3==1|- 24 hours
5 bit
reserve
6 bit
reserve
7 bit reserve
2. Packet with data from connected M-BUS device in universal poll mode
Data is transmitted to LoRaWAN®port 2, universal poll mode
Size in bytes
Field description
Data type
1 byte Packet type, this packet == 3 uint8
2 bytes Total size of the received data by the interface uint16
1 byte Size of that packet uint8
1 byte That packet serial number uint8
1 byte Total number of packets uint8
array Data uint8
LoRa data transmission technology imposes restrictions on the maximum packet size,
depending on the speed at which the given packet is transmitted. If the data received through
the external interface cannot be transmitted in one packet, they are split into several packets,
which are transmitted sequentially.
3. Packet with time correction request
Sent every seven days on LoRaWAN®port 4.
Size in bytes
Field description
Data type
1 byte Packet type, this packet == 255 uint8
4 bytes Time of the modem at a moment of the packet
transmission (unixtime UTC)
uint16

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4. Settings packet
Transmitting on LoRaWAN®port 3.
Размер в байтах Описание поля Тип данных
1 byte Packet type, this packet == 00 uint8
2 bytes ID of parameter uint16
1 byte Data length (len) uint8
len bytes Parameter value -----
2 bytes ID of parameter uint16
1 byte
Data length (len)
uint8
len bytes Parameter value -----
…
…
…
2 bytes ID of parameter uint16
1 byte
Data length (len)
uint8
len bytes Parameter value -----

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CONVERTER M-BUS-2 RECEIVES PACKETS OF THE FOLLOWING TYPES
1. Real-time clock adjustment
Send by application on LoRaWAN®port 4
Size in bytes
Field description
Data type
1 byte Packet type, this packet = 255 uint8
8 bytes The value in seconds for which you need to adjust
the time.
Can be positive or negative
int64
2. Packet with request of settings
Sent by application on LoRaWAN®port 3
Size in bytes Field description Data type
1 byte
Packet type, this packet == 1
uint8
Answering that packet, the device sends the packet with settings.
3. Packet with settings is identical to such packet from device
Size in bytes Field description Data type
1 byte Packet type, this packet == 00 uint8
2 bytes ID of parameter uint16
1 byte Data length (len) uint8
len bytes Parameter value -----
2 bytes ID of parameter uint16
1 byte Data length (len) uint8
len bytes Parameter value -----
…
…
…
2 bytes ID of parameter uint16
1 byte Data length (len) uint8
len bytes Parameter value -----
The package with settings sent to the device may not contain all the settings supported
by the device, but only the part that needs to be changed.
Table of ID of M-BUS-2 parameters and these possible values.
ID of
parameter
Description
Data
length
Possible values
4
Confirmed uplinks
1 byte
1 – confirmed
2 – unconfirmed

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5
ADR (Adaptive Data Rate)
1 byte
1 – enabled
2 – disabled
8
Uplinks number of transmissions
1 byte
from 1 to 15
16
Communication period
1 byte
1 – 1 hour
2 – 6 hours
3 – 12 hours
4 – 24 hours
5 – 5 minutes
6 – 15 minutes
7 – 30 minutes
32
MBUS interface speed
1 byte
1 – 300
2 – 600
3 – 1200
4 – 2400
5 – 4800
6 – 9600
7 – 19200
8 – 38400
33
External M-BUS device type
1 byte
0 – device type not set
1 – Teplouchet-1
2 – STE 21 «Berill»
3 – Danfoss
Sonometer_500
4 – ELF_M
5 – Weser
6 – MULTICAL_801
7 – MULTICAL_402
8 –
LANDIS_GYR_COMMON
9 – SHARKY_775
10 – PULSAR
11 – SONOSAFE_10
12 – CALEC_ST_II
13 – ABB
14 – SENSONIC_II
15 – CALEC_ST_II_2
16 –
ZENNER_MULTIDATA_WR3
17 – PULSE_STK_15
18 – HITERM PUTM -1
49 Data collection period 1 byte 1 – 1 hour
2 – 6 hours
3 – 12 hours
4 – 24 hours
5 – 5 minutes
6 – 15 minutes
7 – 30 minutes
55 Time zone, in minutes 2 bytes from -720 to 840

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5 STORAGE AND TRANSPORTATION REQUIREMENTS
The M-BUS-2 converter shall be stored in the original packaging in heated room at
temperatures +5°С to +40°С and relative humidity less than 85%.
The converter shall be transported in covered freight compartments of all types at any
distance at temperatures -40°C to +85°C.
Long-term storage of the device in the "Storage" mode can lead to battery
passivation