7.4.7 The PKE Field
The PKE field contains two sub-fields: Parameter command and response AK, and Parameter number PNU:
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.
Parameter command
15
14
13
12
0
0
0
0
No command
0
0
0
1
Read parameter value
0
0
1
0
Write parameter value in RAM (word)
0
0
1
1
Write parameter value in RAM (double word)
1
1
0
1
Write parameter value in RAM and EEPROM (double word)
1
1
1
0
Write parameter value in RAM and EEPROM (word)
1
1
1
1
Read/write text
Response slave
⇒
master
Bit no.
Response
15
14
13
12
0
0
0
0
No response
0
0
0
1
Parameter value transferred (word)
0
0
1
0
Parameter value transferred (double word)
0
1
1
1
Command cannot be performed
1
1
1
1
text transferred
If the command cannot be performed, the slave sends this response:
0111 Command cannot be performed
- and issues the following fault report in the parameter value (PWE):
7 RS-485 Installation and Set-up
VLT AQUA Low Harmonic Drive Instruction
Manual
7-8
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
7
