Danfoss vlt aqua Design Manual page 216

7 RS-485 Installation and Set-up
7.11.3 Bus Speed Reference Value
Speed reference value is transmitted to the adjustable frequency drive in
a relative value expressed as %. The value is transmitted in the form of
a 16-bit word; in integers (0-32767) the value 16384 (4000 Hex) corre-
sponds to 100%. Negative figures are formatted by means of 2's com-
plement. The Actual Output frequency (MAV) is scaled in the same way
as the bus reference.
The reference and MAV are scaled as follows:
7
7-30
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MG.20.N5.22 - VLT is a registered Danfoss trademark
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VLT AQUA Drive Design Guide