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C55/C55i AT COMMAND SET Description Preliminary - Falcom

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<strong>C55</strong>/<strong>C55</strong>I <strong>AT</strong> <strong>COMMAND</strong> <strong>SET</strong> VERSION 1.00<br />

9.3 <strong>AT</strong>+CG<strong>AT</strong>T GPRS attach or detach<br />

Syntax<br />

Test Command<br />

<strong>AT</strong>+CG<strong>AT</strong>T=?<br />

Response(s)<br />

+CG<strong>AT</strong>T: (list of supported s)<br />

OK<br />

Response(s)<br />

Read Command<br />

<strong>AT</strong>+CG<strong>AT</strong>T? +CG<strong>AT</strong>T: <br />

OK<br />

Write Command<br />

Response(s)<br />

<strong>AT</strong>+CG<strong>AT</strong>T=[]<br />

OK<br />

ERROR<br />

+CME ERROR<br />

Reference(s) PIN ASC0<br />

GSM 07.07 ● ●<br />

Command <strong>Description</strong><br />

The test command is used for requesting information on the<br />

supported GPRS service states. The read command returns the current<br />

GPRS service state.<br />

The write command is used to attach the MT to, or detach the MT<br />

from the GPRS service. After the command has completed, the MT<br />

remains in V.25ter command state. If the MT is already in the<br />

requested state, the command is ignored and the OK response is<br />

returned. Any active PDP contexts will be automatically deactivated<br />

when the attachment state changes to detached.<br />

If the MT is not able to attach for more than 5 minutes, command<br />

returns with "ERROR" or "+CME ERROR: unknown", but MT is<br />

still trying to attach.<br />

If the MT is not able to detach for more than 1 minute, command<br />

returns with "ERROR" or "+CME ERROR: unknown", but MT is<br />

still trying to detach. If an attach is issued during a running detach,<br />

command returns with "ERROR" or "+CME ERROR: unspecified<br />

GPRS error.<br />

Parameter <strong>Description</strong><br />

(num)<br />

Indicates the state of GPRS attachement.<br />

0 (P) detached<br />

[1] attached<br />

Notes<br />

• If the MT is in dedicated mode, write command returns with<br />

"+CME ERROR: operation temporary not allowed.<br />

• When the module is GPRS attached and a PLMN reselection<br />

occurs to a non-GPRS capable network or to a network where the<br />

SIM is not subscribed to for using GPRS, the resulting GMM<br />

(GPRS mobility management) state according to GSM 24.008 is<br />

This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.<br />

Page 171

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