Chengdu Ebyte Electronic Technology Co.,Ltd.
E104-BT40 User Manual
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
4-16
6.3 AT Command error code description
Error code return form—ERROR (error code index number)
NUM
Description
Cause
Solution
-0
Command does not
exist
AT Command character error
Check character string
-1
Parameter length
error
1
、
Parameter total length is too long
2
、
parameter length is not enough
According to the AT Command manual,
check the parameter length according to
the "Description"
-2
Invalid parameter
Parameter does not meet the value range
View parameter value range by referring
to instruction
-3
Command exists but
does not support the
operation
Only command was entered, error example:
AT + BAUD
Correct example: AT + BAUD?
Compare command and determine
operation
-4
Unconnected
Module is not connected
-
-5
Turn off any baud
rate setting is not
allowed
Turn off the baud rate arbitrarily before
setting the baud rate to a value other than the
normal baud rate
Baud rate is a value other than the normal
baud rate before turning off any setting of
baud rate
Set the baud rate to normal before
turning off any setting of the baud rate
-6
Exceed buffer
length
Input AT command and parameter total
length is too long
Check AT Command and that the total
length of parameter does not exceed 250
bytes
-7
Command invalid
now
-
-
-8
Module is
connected
This command does not support operation in
the connected state
-
-9
No air configuration
authentication
Command can be sent after using AT+AUTH
Command to authentication
-10
Air configuration
authentication failed
Wrong password
1. Use the correct password
2.Reconfigurate via serial port
-11
Unknown error
-
