L-INX User Manual 213 LOYTEC
Version 4.0 LOYTEC electronics GmbH
currently not supported by the LOYTEC device. The M-Bus network also supports two
kinds of broadcast messages. A broadcast to address 255 does not force the slaves to give a
response. A broadcast to address 254 forces an answer from the slave. This broadcast
message is mainly used for peer-to-peer connections.
The M-Bus allows the use of devices with different Baud rates of up to 9600 Baud. M-Bus
devices are not always able to fulfill the complete functional specification of the M-Bus
standard. For readout two different modes are known (some slave devices implement both):
A default read usually reads all the data of a device.
A selective read selects the data points, which are to be read.
Some devices also support writing special data points.
Some M-Bus devices support a synchronized action. This means that when a device
receives such a synchronize command, it stores specific data points for later readout. This
way, specific information of even a larger number of devices can be read out in a
synchronized manner.
M-Bus supports network management functions such as changing the primary address of a
device, changing the Baud rate of a device, reading all data from a device as well as pinging
a device. It is therefore possible to scan M-Bus devices in an M-Bus network.
M-Bus data points are specified by a DIF/DIFE and VIF/VIFE combination. The DIF/DIFE
(data information field and data information field extension) specify storage number, tariff,
subunit as well as the data coding (BCD, int, etc.) and the function (min, max, etc.) of the
data point. The DIF/DIFE can be up to 11 bytes long (1 byte for the DIF and up to 10
extensions). The VIF/VIFE combination (value information field and value information
field extension) specifies the type of the data point (e.g. energy count value) and how it is
presented (e.g., the value is given in ―Wh‖). Like the DIF/DIFE, the VIF/VIFE can consist
of one VIF and up to 10 VIF extensions. The Configurator allows the configuration by
either entering the DIF/DIFE combination or by specifying the appropriate numbers.
10.4 Web Interface
This section describes the Web interface for the M-Bus port.
10.4.1 Configuration
A configuration of the M-Bus port is not necessary, as no parameters are required for the
M-Bus.
10.4.2 Data Points
M-Bus data points can be accessed through the Web UI as described in Section 4.2.15.
10.4.3 Statistics
Figure 166 shows a typical output of the statistics information which can be displayed for
the M-Bus port.
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