L-INX User Manual
233
LOYTEC
Version 4.0
LOYTEC electronics GmbH
10.7.9 M-Bus Protocol Analyzer
When connected to a device a protocol analyzer is available for the M-Bus port. The
protocol analyzer can be found in the M-Bus Management dialog. Figure 180 shows the
dialog for the M-bus protocol analyzer.
The status on the right hand side of the dialog shows, if the device is connected or if the
protocol analyzer is stopped or started. When connected to a device, the protocol analyzer
can be started by pressing the
Start Protocol
button. This starts the protocol analyzer in the
device. Every time a transmission is made on the M-Bus port, the transmission is displayed
in the list. Additionally the protocol data is stored in the device in a rotating log file. The
protocol log can hold up to 40 kB of protocol data. So also when the Configurator was not
running for an interesting time, the protocol data can be loaded from the device using the
Load From Device
button. The protocol data can be stored as CSV file using the
Save
button, with the
Clear
button, the shown protocol is deleted.
Figure 180 M-Bus protocol analyzer.
Figure 181 shows a typical protocol analyzer output for the M-Bus port. It shows the
following information:
Seq.
: sequence number, which is automatically created in the device. This number
is unique for one port.
Timestamp:
transmission time.
Frame Type:
M-Bus frame type (Short Frame, Control Frame Long Frame, E5 –
in this case, no other data follows).
Dir.
: direction. Either SND (send) or RCV (receive)
Start1, Start2:
Start byte (must be equal)
Length1, Length2:
Frame length according to the M-Bus standard (must be equal)
C Field:
Control field
Address:
M-Bus address
CI Field:
Control information field
Checksum:
Checksum of the frame
Stop:
Stop byte
Payload:
Payload in hexadecimal numbers (this column cannot be used for
sorting)
Some frame types do not contain the full set of fields. Please refer to the M-Bus standard for
additional information.
