Danfoss VLT HVAC Drive FC 102, Instructions Manual, Page: 5 / 29

2.1.6 General Commands (Acknowledged)
VLT Response Command Subcommand
NPA Object
no.
Attribute Message Type Error Code Comments
ACK 0 4 -
Poll Message
No Acknowledge
-
The slave is to respond with any data
points, analog or binary I/O that have
been flagged for COS
ACK 0 5 -
Poll message
With Acknowledge
-
The slave is to respond with any data
points, analog or binary I/O that have
been flagged for COS
ACK 0 9 - Status update Message -
Slave device must respond with device
manufacturing model number (Par. 6-21),
days in service (Par. 6-00) and device
status
ACK F - - Identify Device Type -
Slave device responds with an identifica-
tion number of 10H to indicate non JCI
device
ACK 0 0 - Synch Time -
The internal clock is syncronized by this
command
ACK, no action 8 0 - Upload -
Optional, no support in the frequency
converter
ACK, no action 8 1 - Upload -
Optional, no support in the frequency
converter
ACK, no action 8 3 - Upload Record -
Optional, no support in the frequency
converter
ACK, no action 8 4 - Upload Complete -
Optional, no support in the frequency
converter
ACK, no action 9 0 - Download -
Optional, no support in the frequency
converter
ACK, no action 9 1 - Download -
Optional, no support in the frequency
converter
ACK, no action 9 3 - Download -
Record optional, no support in the
frequency converter
ACK, no action 9 4 - Download Complete -
Optional, no support in the frequency
converter
NAK 0 1 - Read Memory 01
Slave device memory read based on
memory addresses
NAK 0 8 - Warm Start 01 JCI use only
Instructions
VLT
®
Metasys
MG.11.G2.02 - VLT
®
is a registered Danfoss trademark 5
2 2