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If the operation fails, it will return to the abnormal response frame. The abnormal response frame includes the
error code and exception
code. In which, the error code = (command code + 0x80), and the exception code
indicates the error cause.
Abnormal response frame format:
Application-layer protocol data unit Data length (number of bytes) Value or range
Error code 1
(Command code + 0x80)
Exception code 1
The exception codes and their meanings are as follows:
Exception code Meaning
0x01 Invalid command code
0x02 Invalid register address.
0x03 Data error (the data is not within the upper/lower range).
0x04
Slave operation failure (including the error caused by that the data is within the upper/lower range,
but it is invalid).
0x05
The command is valid and in process (It is mainly used to save the data into the nonvolatile memory
cell).
0x06
The salve is busy, please try again later. It is mainly used to save the data into the nonvolatile
memory cell.
0x16
Operation not supported (mainly refer to the control parameter and status parameter, for example,
do not support reading the property, leave-factory value and upper/lower limit)
0x17
The number of registers in the request frame is wrong (for example, when the operation is 32-byte,
the number of bytes is odd).
0x18 Information frame error (including information length error and verification error).
0x20 Parameters cannot be changed.
0x21 Parameters cannot be changed during the drive running.
0x22 Password required for parameters.
2. Change the single 16-byte function code parameter and status parameter of the drive, and the parameter
values will not be saved after power off.
When this command is used, the parameter value changed will not be saved upon power on after power off.
The application-layer protocol data units are as follows.
Request format:
Application-layer protocol data unit Data length (number of bytes) Value or range
Command code 1 0x06
Register address 2 0x0000~0xFFFF
Register content 2 0x0000~0xFFFF
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