Danfoss VLT Series Design Manual page 142

7. RS-485 Installation and Set-up
Bits no. 12-15 transfer parameter commands from master to slave and return processed slave
7
responses to the master.
Parameter commands master ⇒ slave
Bit no.
15
0
0
0
0
1
1
1
Response slave ⇒master
Bit no.
15
0
0
0
0
1
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):
142
Parameter command
14 13 12
0 0 0 No command
0 0 1 Read parameter value
0 1 0 Write parameter value in RAM (word)
0 1 1 Write parameter value in RAM (double word)
1 0 1 Write parameter value in RAM and EEPROM (double word)
1 1 0 Write parameter value in RAM and EEPROM (word)
1 1 1 Read/write text
Response
14 13 12
0 0 0 No response
0 0 1 Parameter value transferred (word)
0 1 0 Parameter value transferred (double word)
1 1 1 Command cannot be performed
1 1 1 text transferred
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
VLT ® HVAC Drive Design Guide