Danfoss VLT Series Design Manual page 151

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VLT HVAC Drive Design Guide 7. RS-485 Installation and Set-up
7.11.3. Bus Speed Reference Value
Speed reference value is transmitted to the
frequency converter in a relative 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%. Neg-
ative 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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MG.11.B2.02 - VLT is a registered Danfoss trademark