Danfoss VLT AAF00x Instruction Manual page 99

RS-485 Installation and set...
Process block (PCD)
The PCD is made up of a data block of 4 bytes (two words) and contains:
- Control word and reference value (from master to slave)
- Status word and present output frequency (from slave to master)
STX LGE
Parameter block
The parameter block is used to transfer parameters between master and slave. The data block is made up of 12 bytes (6
words) and also contains the process block.
STX LGE
7 7
Text block
The text block is used to read or write texts via the data block.
STX LGE
7.3.7 The PKE Field
The PKE field contains two sub-fields: Parameter command
and response AK, and parameter number PNU:
AK
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bits no. 12-15 transfer parameter commands from master
to slave and return processed slave responses to the
master.
7-4
VLT Active Filter AAF 00x
ADR PCD1
ADR PKE IND
ADR PKE IND
PKE IND PWE
high
PNU
MG.90.V2.22 - VLT
PWE PWE
high low
Ch1 Ch2 Chn
Parameter commands master ⇒ slave
Bit no.
15 14
0 0
0 0
0 0
PWE
low
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
If the command cannot be performed, the slave sends this
response:
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is a registered Danfoss trademark
PCD2
PCD1 PCD2
PCD1 PCD2
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
BCC
BCC
BCC