Nibe MODBUS 40 Installateurhandbuch Seite 17

Communication
TIP
ModbusManager can be downloaded via
www.nibe.se/kommunikation.
Read the values
There are two ways of reading the values from the heat
pump/indoor module, 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 (cor-
responds to 20x16-bits Modbus-register). If
more parameters 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 out. The file is created
in ModbusManager. See section "Create a log set-
tings file in ModbusManager" for instructions.
2. Save LOG.SET to a USB-memory.
3. Insert the USB-memory into the heat pump's/in-
door module's display unit.
4. Enter menu USB.
5. Enter menu "logging".
6. Tick "activated".
7. Remove the USB-memory.
The heat pump/indoor module will now update the
values for all defined parameters twice a second.
Retrieve the values for the Modbus-master by using
the "Read holding registers" command with the desired
parameter addresses. Use ModbusManager, see
LOG.SET in a text editor or see the examples list on
page 19 to see which parameter address a value has.
See section The Modbus command on page 19 for
further information about different commands.
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