Communications Reference Information
Append
ix
B
B–18
Communications Reference Information
Inverter
Affirmative Reply
The standard affirmative reply from the inverter
uses the ACK character (acknowledge) in the data
field. The frame format of this reply follows the
diagram and specification table.
Inverter
Negative Reply
The standard negative reply from the inverter
uses the NAK character (negative acknowl-
edge) in the data field. The frame format of
this reply follows the diagram and specifica-
tion table.
The error codes for a NAK (negative acknowledge) are:
If a host computer broadcasts a command to all inverter stations, no response will be returned
to the host.
Element
Description
Size
Value
STX
Control code (STart of TeXt)
1 byte
STX (0x02)
Node
Node (station) address of inverter
2 bytes 01 to 32
ACK
Control code (ACKnowledge)
1 byte
ACK (0x06)
BCC
Block check sum code
2 bytes Exclusive OR of Node and ACK
[CR]
Control code (carriage return)
1 byte
[CR] (0x0D)
STX Node
ACK
BCC [CR]
Frame format
Element
Description
Size
Value
STX
Control code (STart of TeXt)
1 byte
STX (0x02)
Node
Node (station) address of inverter
2 bytes 01 to 32
NAK
Control code
(Negative ACKnowledge)
1 byte
NAK (0x15)
Error code
Code representing error type
2 bytes (See next table below)
BCC
Block check sum code
2 bytes Exclusive OR of Node, Data,
and NAK
[CR]
Control code (carriage return)
1 byte
[CR] (0x0D)
Error
Code
Error Description
Error
Code
Error Description
01H
Parity error
07H
Receive buffer overrun error
02H
Check sum error
08H
Receive time-out error
03H
Framing error
11H
Abnormal command code error
04H
Overrun error
13H
Execution disabled
05H
Protocol error
16H
Abnormal parameter code/value
error
06H
ASCII code error
—
—
Node
BCC
[CR]
Frame format
STX
NAK
Error
code