Page 43 of 78 Article no.: 1080621023 2022_02_14 Subject to technical change! Errors excepted.
1.2.2 Additional technical specifications
The installation has to fulfill the requirements of the relevant norms / standards / literature (see paragraph 2.1) and
the specifications as follows:
Maximum voltage M-Bus
42 V
Minimum voltage M-Bus
24 V
Maximum ripple voltage
200 mV; EN 13757-2_2004; 4.3.3.6
Maximum voltage potential
differences
2 V
1.2.3 Technical data M-Bus
Primary address
0 (factory setting); 1 - 250 (configurable)
Baud rate
2400; 300
Connecting cable length
1 m
Number of possible read-outs
unlimited
Refresh of data
120 s; using a power pack: 2 s
1.3 Modbus RTU (optional)
The Modbus RTU Module is a galvanically isolated interface for the transmission of meter data (absolute values). It
is designed for use with S3 heat meter and S3C calculator to connect them to Modbus RTU network using EIA-485
channel.
1.3.1 Technical data Modbus
Connector A
PowerSupply 12 V DC ± 10% (SELV power supply only)
Connector B
Modbus Network
Maximum power consumption
500 mW
Communication protocol
Modbus RTU
Channel
EIA-485 (galvanically isolated)
Baud rate
1200, 2400, 4800, 9600, 14400, 19200, 38400, 56000, 57600, 115200
1.3.2 Default factory settings
Communication parameters
9600 bps, 8N1 data format (8 data bits, none parity, 1 stop bit)
Update Rate Data from Meter
600 s
Modbus Slave ID*
1
Automatic Slave ID**
0 (deactivated)
* Acceptable values: 1 … 247
** If the automatic Slave ID is activated (set to = 1), the M-Bus address which is set in the meter is used for
communication.
1.4 Wireless Interfaces
Engelmann offers the following radio interfaces:
-
wireless M-Bus interface EN 13757-3, -4 (see chapter 1.4.1)
-
LoRaWAN communication interface (see chapter 1.4.2)
General information about the radio interface:
Installation of radio components between or behind heating pipes, or the presence of other bulky metallic
obstacles directly over or in front of the housing must be avoided.
The transmission quality (range, telegram processing) of radio components can be negatively influenced by
instruments or equipment with electromagnetic emissions, such as telephones (particularly LTE mobile radio
standard), wi-fi routers, baby monitors, remote control units, electric motors, etc.
In addition, the construction of the building has a strong influence on the transmission range and coverage.
Furthermore, when using installation boxes (substations) they must be equipped with non-metallic covers or doors.
