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M-Bus

The M-Bus driver can read values from M-Bus Slave devices which work according EN13757 standard on 2-wire technology.

The M-BUS driver name is: mbus
The routing address for the first M-Bus driver is: 60
The data point file for the first M-BUS driver is called: mbus1.txt
The configuration file for global settings of the first M-BUS driver is: mbus1.cfg

For the M-BUS driver as well as all other gateway drivers the data point definitions are as follows:

Type Description
M Integer value (binary data points, counters) which can/shall only be read by the gateway
S Integer value which can be either read or written by the gateway. (to M-BUS writing is not possible)
X Floating point value (with decimal place) which can/shall only be read by the gateway
Y Floating point value (with decimal place) which can be either read or written by the gateway. (to M-BUS writing is not possible)
A String, is used e.g. with BACnet Trends and ESPA4.4.4 data points

Addresses are defined as follows:

„<slave> <type> [<no>]“

Communication state with slave device: „<slave> failure“

While following definition is valid:

Parameter Range of values Description
<slave> 1 - 250
SXXXXXXXX
primary address or
8 digit secondary address (with prefixed „S“) of the addressed slave device
<type> failure,
value,
vif,
ident,
manufacturer,
medium,
accesno,
signature,
version,
status,
sBit
communication failure with counter, virtual
value field <no>
VIF-field <no>
manufacturer specific counter number
manufacturer code IEC 870
media code
amount of accesses
reserved
version
status field
status bit from status field (no: 1..8)
<nr> integer 1 - 127 <no>-th value from the „variable data structure“-data set (–> s. manufacturer's documentation ).

The address of the first value of slave „2“ will be defined in mbusX.txt as follows:

[X 2 value 1]

Values are defined to the basic units (W, Wh, m3, …). By using the format field values can be converted into other prefix units. Please see example below:

format = <format>

<format> can have following values:

<format> description
u micro (e.g. Micrometer, MicroLiter)
m milli (e.g. Millimeter, Milliliter)
k kilo (e.g. Kilowatt, Kilometer)
M Mega (e.g. Megawatt)
G Giga (e.g. Gigawatt)

Note: If ':' followed by a hexadecimal number then this number will be searched in the DIF/VIF fields of the data frame. Then the <no> value is purely used to separate data points. The <no>-th value from „variable data structure“-data set is NOT used!

Typical data point definitions can be:

[M 2 failure]
 name = communication failure with slave 2
 query = pe
[M 2 value 1]
 name = digital operation message
 query = pe
[X 2 value 2]
 name = measure temperature value
 query = pe
 format = 
[X 2 value 3]
 name = power consumption
 query = pe
 format = k
[X S12345678 value 3]
 name = power consumption
 query = pe
 format = k
[M 2 ident 3]
 name = manufacturer specific device ID
 query = pe
 

Tips and notes

For some meters it may be necessary to increase the waiting time between the individual characters of a telegram. To do this, you can set the configuration parameter „ReceiveInterCharTimeout“ to a higher value, e.g. 500 (ms). The default value is 300 ms.

When using the M-Bus meter scan, it can happen in large systems that a scan takes longer. Here there is a time limit, which is 600 seconds (10 minutes) in the default value. Here, a higher duration can be defined via the configuration parameter „MeterScanTimeout“.

Notes on polling behavior

How often a meter is polled depends on the „CacheTimeout“ entry in the configuration file. The global parameter is effective if the meter itself does not already have another entry.

How often the driver starts a poll run (or poll attempt) is specified by the „Interval“ parameter. If a value greater than „CacheTimeout“ is specified for „Interval“, then the poll interval is also greater.

Normally, the interval can be left at 1 second, so that the „CacheTimeout“ takes effect.

Additional M-Bus interface via RS485

Some units can communicate M-Bus via an RS485 interface. If an M-Bus driver is to be used via the RS485 interface, this must be set in the driver configurations (General → Update → Driver configuration). For this purpose, the COM3 (external) interface must be selected via the „Edit field“. (see also FAQ: What is the combination of serial and logical interface on the UGW?).

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m-bus_en.txt · Zuletzt geändert: 02.11.2022 08:38 von jhe

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