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7. After the "VDD Scan", the temperature sensors of the case controller can now be assigned to the connected
temperature displays VDD 500.
Practical tip:
In practice, two temperature displays - one for each temperature zone - are usually used to
display the return air temperatures R4.1 and R4.2 (F). If required, two additional temperature displays can
be installed for the display, for example, of the two return air temperatures R2.1 and R2.2 (G).
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Brief information for the configuration
Attention!
Temperature displays with the
same two digits
at the end of their serial number
must
not
be connected at the same time to a case controller, as they can no longer be uniquely identified
during / after a VDD scan and this will cause problems!
During the VDD scan (menu 6-1), the addresses 1..100 are automatically queried for max. 4
temperature displays. The temperature displays respond to the query according to the last two
digits of their serial number (SN) and are registered in the controller. If the last two digits of the
serial number are "00", then this corresponds to the address "100".
If 2 temperature displays have been connected and addresses 09 and 28, for example, have
been found via VDD Scan, the VDD scan is not terminated until after reaching address 100 -
i.e. not until all possible addresses have been queried - max. duration approx. 2 minutes.
The address of the temperature display is shown during the VDD scan.
If 4 temperature displays have been connected and addresses 03, 09, 28 and 32, for
example, have been found via VDD Scan, then the VDD scan will be automatically
terminated after the fourth device found, as all 4 possible temperature displays have been
found.
After the
initial scan,
the return air sensor R4.1 (terminals Z21/Z22) is automatically assigned to all
temperature displays. Afterwards, sensors can be assigned to the determined temperature
displays. For full details and description of the VDD scan, automatic addressing and assignment of
temperature sensors, see operating manual Case Controller UA 4xx E:
