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HUAWEI MG323 GSM M2M Module
AT Command Interface Specification Commands for Data Services
Issue 02 (2010-11-23)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
117
9.4.1 Querying the Layer-2 Protocol Supported Between the TE
and MT
Test
command
AT+CGDATA=?
Function
Checks the layer-2 protocol supported between the TE and MT.
Response
z
In case of successful execution:
<CR><LF>+CGDATA: (list of supported <L2P>s)<CR><LF>
<CR><LF>OK<CR><LF>
z
In case of an error during command execution:
<CR><LF>ERROR<CR><LF>
z
In case of an error related to the MT: <CR><LF>+CME ERROR:
<err><CR><LF>
Parameter description
<L2P >: character type parameter, which indicates the layer-2 protocol used between
the TE and MT. The default value is PPP.
“PPP” layer-2 protocol
9.4.2 Establishing Communication Between the TE and Network
Write
command
AT+CGDATA=[<L2P>[,<cid>[,<cid>]]]
Function
Establishes communication between the TE and network.
Response
z
In case of successful execution:
<CR><LF>CONNECT<CR><LF>
z
In case of failed communication establishment: <CR><LF>NO
CARRIER<CR><LF>
z
In case of failed command execution:
<CR><LF>ERROR<CR><LF>
z
In case of an error related to the MT: <CR><LF>+CME ERROR:
<err><CR><LF>
Parameter description
<cid>: numeric parameter, which indicates the index value of the PDP context; value
range: 1–3. Other commands related to the PDP context can invoke the saved
settings through this index value. For a TE-MT interface, this parameter is local and
can be used for other commands related to the PDP context. If <cid> is not specified
or the defined PDP context is not matched, the MT activates the PDP context of IP
type. Other parameters retain the default values (for details, see AT+CGDCONT,
AT+CGQREQ, and AT+CGQMIN).