Nibe MODBUS 40 Installateurhandbuch Seite 13

Communication
Read the values
There are two ways of reading the values from the heat
pump, automatically or manually.
Automatic reading: can retrieve up to 20 predefined
parameters at the same time.
Manual reading: takes longer and only one value at
a time can be retrieved.
Automatic reading
Caution
Maximum 20 parameters defined in the LOG.SET
file can be used by MODBUS 40 (corresponds
to 20x16-bits Modbus-register). If more paramet-
ers are selected, the first 20 parameters are used.
A small number of parameters are 32-bit, and
therefore take up two registry locations, which
means that fewer parameters can be read.
1.
Create a LOG.SET file that contains the predefined
values that are to be read off. The file is created in
ModbusManager or LogManager. See section for
instructions.
2. Save LOG.SET to a USB memory.
Caution
It is not possible to have different pre-
defined parameters for logging on the
USB memory and for use with MODBUS
40.
3.
Insert the USB memory into the heat pump's control
unit.
4. Enter the USB menu.
5.
Enter menu "logging".
6.
Tick "activated".
7. Remove the USB memory.
The heat pump will now update the values for all defined
parameters every second.
Retrieve the values for the Modbus client by using the
"Read holding registers" command with the desired
parameter addresses. Use ModbusManager/NIBE Applic-
ations, view LOG.SET in a text editor or see the example
list on page 15 to see which parameter address a value
has.
See section The Modbus command on page 15 for more
information.
Create a log settings file
First install the software ModbusManager on your com-
puter. The software is on the supplied USB memory.
If you already have LogManager installed it is OK to use
that software.
1.
First select heat pump model under menu "Models".
2.
You can scroll between the available parameters for
the selected heat pump in the left-hand column.
Information about the selected parameter is displayed
in the box under the list.
3. Mark a parameter and click on the right-hand arrow
to transfer it to the right-hand column.
4.
The right-hand column shows which parameters will
be logged.
Transfer all parameters you want to log.
5. When you are happy with the list, click "Save config-
uration".
6.
A dialogue box appears that asks where you want
to save your log settings file. USB memory is
preselected if connected to the computer.
Save the file on the computer or directly on a USB
memory.
Caution
The file name must be LOG.SET for the heat
pump to read the file.
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