Danfoss VLT HVAC, Руководство по конструкции, Страница: 134 / 200

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:
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
7 RS-485 Installation and Set-up VLT ® HVAC Drive Design Guide
134
MG.11.B9.02 - VLT
®
is a registered Danfoss trademark
7