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HUAWEI MG323 GSM M2M Module
AT Command Interface Specification Commands for Call Control
Issue 02 (2010-11-23)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
66
7.10 +++ - Command for Switching Data Mode to
Command Mode
The +++ command switches data mode to command mode during the connection of
CSD services or GPRS data services.
Execution
command
+++
Function
After “+++” is executed, the TA terminates the data transmission
stream on the AT interface and enters the command mode so that AT
commands can be executed when the links towards remote terminals
or GPRS connections are maintained.
Response
<CR><LF>OK<CR><LF>
Note:
z
To prevent the entered command line from being confused with “+++” in the transmission
data stream, do not enter other characters within 1000 ms before and after entering the
command line. In addition, two adjacent ‘+’s must be entered at a time interval of smaller
than 1000 ms.
z
In multiplexing mode, this command is unavailable. In this case, you need to enter other exit
instructions (such as DTR signals and modem status command MSC) to switch data mode
to command mode.
7.11 ATO - Command for Switching Command Mode to
Data Mode
The ATO command switches command mode to data mode. When a CSD call or
GPRS connection is established, the TA is in command mode. This command can
switch command mode to data mode or PPP online mode.
Execution
command
ATO[<n>]
Function
Switches command mode to data mode.
Response
In case of successful execution: <CR><LF>CONNECT <CR><LF>
In case of failed connection recovery: <CR><LF>NO
CARRIER<CR><LF>
Parameter description
<n>: integer; ATO is equivalent to ATO0.
0 (default value): switches command mode to data mode.