Table 3.4 Description of Slave Error Code
Error
code
Fault description
Troubleshooting method
0x00
works normally
None
0x01
Illegal function
code
The device does not support the current function
code, please refer to the slave station manual to select
the corresponding function code module
0x02
Illegal data address
The device data exceeds its address range, refer to
the slave station manual to modify the data start
address or data length
0x03
Illegal data value
Data length error, the data length exceeds the
maximum allowable value of 125 (Word) or 2000
(Bit), modify the length
0x04
Data processing
error
Check whether the data value range meets the
requirements of the slave
0x05
The length of the
application layer
does not match
Increase the receiving character interval and check
the communication parameter settings
0x06
Protocol ID error
Check the sender message
0x07
Cache address error
Device internal error
0x08
Bit offset error
Device internal error
0x09
Slave station ID
number does not
match
Increase the timeout time, check the hardware
connection status, and check the communication
parameter settings
0x0A
CRC error
CRC error, check the communication line
0x0B
LRC error
LRC error, check the communication line
0x0C
Response function
code does not match
Check hardware connection status
0x0D
Response address
does not match
Check hardware connection status
0x0E
Response data length
does not match
Check hardware connection status
0x0F
Communication
timeout
Increase the timeout time, check the hardware
connection status, and check the communication
parameter settings
0x10
ASCII mode start
character error
„:‟ colon start character error
0x11
ASCII mode
terminator error
CR/LF carriage return and line feed terminator error