At+Cgatt Gprs Attach Or Detach - Multi-Tech MultiModem EDGE Reference Manual

11.3 AT+CGATT GPRS Attach or Detach

The test command is used for requesting information on the supported GPRS service states.
Description:
The read command returns the current GPRS service state.
The write command is used to attach the MT to, or detach the MT from the GPRS service. After
the command has completed, the MT remains in V.250 command state. If the MT is already in
the requested state, the command is ignored and the OK response is returned. Any active PDP
contexts will be automatically deactivated when the attachment state changes to detached.
Test Command:
Response:
Read Command:
Response:
Write Command:
Response:
Parameter Descriptions:
<state>
Indicates the state of GPRS attachment.
0 detached
1 attached. Default.
Notes:
•
If the MT is in dedicated mode, write command returns "+CME ERROR: operation temporary not allowed".
•
When the module is GPRS attached and a PLMN reselection occurs to a non-GPRS network or to a network
where the SIM is not subscribed to for using GPRS, the resulting GMM (GPRS mobility management) state
according to GSM 24.008 is REGISTERED/NO CELL, meaning that the read command will still show <state>=1.
•
Under some network conditions the GPRS attach command fails, if entered immediately after a "+CREG: 1"
URC. This can be avoided by waiting at least 1s before entering the GPRS attach command.
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
AT+CGATT=?
+CGATT: (list of supported <state>s)
OK
AT+CGATT?
+CGATT: <state>
OK
AT+CGATT=[<state>]
OK
ERROR
+CME ERROR
Chapter 11 – GPRS Commands
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