Examples; Modbus Rtu Overview - Danfoss VLT Series Design Manual

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VLT HVAC Drive Design Guide

7.5. Examples

7.5.1. Writing a parameter value
Change par. 4-14
Write the data in EEPROM.
PKE = E19E Hex - Write single word in par.
4-14 Motor Speed High Limit [Hz]
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 03E8 Hex - Data value 1000, cor-
responding to 100 Hz, see Conversion.
Note: Parameter 4-14 is a single word, and the
parameter command for write in EEPROM is
"E". Parameter number 414 is 19E in hexa-
decimal.
The response from the slave to the master will
be:
7.5.2. Reading a parameter value
Read the value in par. 3-41
PKE = 1155 Hex - Read parameter value in
par. 3-41
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 0000 Hex
If the value in par. 3-41
s, the response from the slave to the master
will be:

7.6. Modbus RTU Overview

7.6.1. Assumptions
These operating instructions assume that the installed controller supports the interfaces in this
document and that all the requirements stipulated in the controller, as well as the frequency con-
verter, are strictly observed, along with all limitations therein.
Motor Speed High Limit [Hz]
Ramp 1 Up Time.
Ramp 1 Up Time
Ramp 1 Up Time
NB!
3E8 Hex corresponds to 1000 decimal. The conversion index for par. 3-41 is -2, i.e.
0.01.
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MG.11.B2.02 - VLT is a registered Danfoss trademark
7. RS-485 Installation and Set-up
to 100 Hz.
The telegram will look like this:
is 10
7
133