Danfoss VLT HVAC Drive FC 100 Series Design Manual page 132

7. RS-485 Installation and Set-up
Text block:
The text block is used to read or write texts via the data block.
7.4.7. The PKE Field
The PKE field contains two sub-fields: Parameter command and response AK, and Parameter number PNU:
7
Bits no. 12-15 transfer parameter commands from master to slave and return processed slave responses to the master.
Parameter commands master ⇒ slave
Bit no.
15 14
0 0
0 0
0 0
0 0
1 1
1 1
1 1
Response slave ⇒master
Bit no.
15 14
0 0
0 0
0 0
0 1
1 1
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Parameter command
13 12
0 0 No command
0 1 Read parameter value
1 0 Write parameter value in RAM (word)
1 1 Write parameter value in RAM (double word)
0 1 Write parameter value in RAM and EEprom (double word)
1 0 Write parameter value in RAM and EEprom (word)
1 1 Read/write text
Response
13 12
0 0 No response
0 1 Parameter value transferred (word)
1 0 Parameter value transferred (double word)
1 1 Command cannot be performed
1 1 text transferred
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VLT HVAC Drive Design Guide