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M-BUS-2 / User Manual
4 COMMUNICATION PROTOCOL – 1.1 VERSION
This part describes the M-BUS-2 data exchange protocol with LoRaWAN
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
Size in bytes
Field description
1 byte
Packet type, this packet = 1)
1 byte
Battery level, %
1 byte
Values of basic settings (bit field)
4 bytes
Meter secondary address
Time of readings in this packet (unixtime UTC), by the
4 bytes
internal clock of the converter
4 bytes
The amount of thermal energy consumed, Wh
4 bytes
Total volume of coolant, l
4 bytes
Operating time, h
2 bytes
Current flow temperature ⁰С*100
2 bytes
Current temperature in the return line ⁰С*100
2 bytes
Current flow of coolant, l/h
4 bytes
Current flow of coolant, l/h
1 byte
Environment (water, heat, gas, etc.)*
4 bytes
Power, W
* 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.
Revision 10
13.10.2021
-
port 2
®
network.
®
Data type
uint8
uint8
uint8
uint32
uint32
uint32
uint32
uint32
uint16
uint16
uint16
uint32
uint8
uint32
15
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