Modbus Rtu Overview - Danfoss VLT HVAC Drive FC 100 Series Design Manual

®
VLT HVAC Drive Design Guide
Write the data in EEPROM.
PKE = E19E Hex - Write single word in par. 4-14
[Hz]
IND = 0000 Hex
PWEHIGH = 0000 Hex
PWELOW = 03E8 Hex - Data value 1000, corresponding 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 hexadecimal.
The response from the slave to the master will be:
7.5.2. Reading a parameter value
Read the value in par. 3-41 Ramp 1 Up Time.
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 Ramp 1 Up Time
slave to the master will be:
NB!
3E8 Hex corresponds to 1000 decimal. The conversion index for par. 3-41 is -2, i.e. 0.01.

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 converter, are strictly observed, along with all limitations therein.
7.6.2. What the User Should Already Know
The Modbus RTU (Remote Terminal Unit) is designed to communicate with any controller that supports the interfaces defined in this document. It is
assumed that the user has full knowledge of the capabilities and limitations of the controller.
Motor Speed High Limit
Ramp 1 Up Time
is 10 s, the response from the
MG.11.B7.02 - VLT ® is a registered Danfoss trademark
7. RS-485 Installation and Set-up
The telegram will look like this:
7
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