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8 Communications Functions
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
8-3 Explanation of Each Function Code
8
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
Error check
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 Explanation
01 hex An unsupported function is 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 does not allow this function because:
• Inverter is in a communications busy state.
• Function attempts to change a register that cannot be changed during RUN.
• Function attempts to issue the Enter command during RUN (in an undervoltage state).
• Function attempts to write data to a register during trip (in an undervoltage state).
• Function attempts to write data to a read-only register (coil).
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