9 Communications Functions
9 - 18
High-function General-purpose Inverter RX2 Series User’s Manual
The broadcast and master request for response. Although the slave Inverter normally returns a
response to the query, it will return an exception response if the query has an error.
A exception response has the following field configuration.
The details of the field configuration are as shown below. An exception response will have a function
code, which is the sum of the function code value of the query and 80 hex. A exception code shows the
reason why the exception response is returned.
Function code
Exception code
Exception Response
Field Configuration
Slave address
Function code
Exception code
CRC-16
Query Exception response
01 hex 81 hex
03 hex 83 hex
05 hex 85 hex
06 hex 86 hex
0F hex 8F hex
10 hex 90 hex
Code Description
01 hex An unsupported function was specified
02 hex The specified address does not exist
03 hex The specified data is in an unacceptable format
21 hex Writing to a holding register is specified, but the data is out of the range allowed for the inverter.
22 hex
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.
23 hex A function code for writing was used to the parameter specialized for readout
26 hex Data was written during data writing or execution of data initialization.
27 hex There was an access to only the higher side register of 2 register long parameter.
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