At Command Error Code - USR IOT Cortex-M7 Series At Command Manual

3. After receiving 'a', the USR module sends '+ok'to the device or tool and enters the AT instruction mode
4. After receiving '+ok', the device or tool knows that the USR module has entered AT instruction mode and can send AT
commands to it.
To exit the command mode,the following steps are used.
1. The serial device or tool sends instructions AT+ENTM to the module
2. After receiving the command, the module returns '+ok' and returns to its previous working mode
AT command basic syntax:<AT+><CMD>[OP][para-1,para-2,para-3,para-4...]<CR>
Character Definition
s
<> Name enclosed in angle brackets is a syntactical element, they must be
included. Angle brackets do not appear on command line.
[] Optional parameter of a command or an optional part of AT information
response.
Square brackets do not appear on command line.
AT+ AT command header
CMD Command code
OP Operator e.g. '='indicates Setting, 'NULL'indicates No operator
para-n Parameters when setting
CR Carriage return character,command line terminator character,0X0D in
ASCII
Response basic syntax:<CR><LF>+<RSP>[para-1,para-2,para-3,para-4...][CR][LF]
Character Definition
s
CR Carriage return character,0X0D in ASCII
LF Linefeed character,0X0A in ASCII
+RSP Response
+OK indicates success
ERR indicates fail
para-n Parameters
CR Carriage return character
LF Linefeed character
2.3.

AT command error code

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Table 1 AT command syntax
Table 2 Response syntax
Table 3 Error Code Overview
7
AT command set
Required
Yes
No
Yes
Yes
No
No
Yes
Required
Yes
Yes
Yes
No
Yes
Yes
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