14-19
Chapter 14
RS485 Communication
14.4.9
Exceptional Responses
• The master inverter requires a response to a query
transmitted not by a broadcasting. • Inverters have to
return responses corresponding to queries, but when
there is an error in queries, inverters return an
exceptional response.
• Details of field composition are showed. The value of
function code is obtained by adding 80h to a query
subjected to an exceptional response. An exception code
indicates a factor of exceptional response.
Function code
Query
Exception Response
01h
81h
03h
83h
05h
85h
06h
86h
0Fh
8Fh
10h
90h
17h
97h
• Field composition for exceptional response is as shown
below.
Field composition
Slave address
Function code
Exception code
CRC-16
Exception code
Code
Description
01h
An unsupported function was specified.
02h
The specified address does not exist.
03h
The specified data is in an unacceptable
format.
21h
In writing to a retention register, the data is
beyond the range of the inverter.
22h
The inverter is in the state that it doesn’t
permit functions to be executed as following:
• a register for which changes are inhibited
during running was about to be changed;
• data was written to a register to which
soft-lock has been applied;
• an ENTER instruction was executed during
running;
• an ENTER instruction was executed during
undervoltage;
• data was about to be written to a register
when auto-tuning is enable; and so on.
23h
A function code for writing was used to the
parameter specialized for readout.
26h
Data was written during data writing or
execution of data initialization.
27h
There was an access to only the higher side
register of 2 register long parameter.
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