The Pke Field - Danfoss VLT HVAC Design Manual

RS-485 Installation and Set...
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
Text block
The text block is used to read or write texts via the data block.
STX LGE

7.4.7 The PKE Field

7 7
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.
Parameter commands master ⇒ slave
Bit no.
15 14
0 0
0 0
0 0
0 0
1 1
1 1
1 1
128
VLT
ADR PKE IND
ADR PKE IND
PKE IND PWE
high
PNU
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
MG11BB02 - VLT
®
HVAC Drive Design Guide
PWE PWE
high low
Ch1 Ch2 Chn
PWE
low
®
is a registered Danfoss trademark
PCD1 PCD2
PCD1 PCD2
BCC
BCC