Danfoss VLT AQUA Design Manual page 152

7. RS-485 Installation and Set-up
NB!
All bits in the STW are set to '0' if the connection between the Interbus option and the frequency converter is lost, or an internal
communication problem has occurred.
7.11.3. Bus Speed Reference Value
Speed reference value is transmitted to the frequency converter in a rel-
ative value in %. The value is transmitted in the form of a 16-bit word;
in integers (0-32767) the value 16384 (4000 Hex) corresponds to 100%.
Negative figures are formatted by means of 2's complement. The Actual
Output frequency (MAV) is scaled in the same way as the bus reference.
The reference and MAV are scaled as follows:
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VLT AQUA Drive Design Guide