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MC55 AT Command Set

10.1 AT+CGACT

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MC55_ATC_V01.05 Page 244 of 469 2/10/04

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The write command is used to activate or deactivate the specified PDP context(s). After the command has com-

pleted, the MT remains in V.25ter command state. If any PDP context is already in the requested state, the state

for that context remains unchanged. If the MT is not GPRS attached when the activation form of the command

is executed, the MT first performs a GPRS attach and them attempts to activate the specified contexts. If no

<cid>s are specified the activation/deactivation form of the command activates/deactivates all defined contexts.

If the MT is not able to activate a context because of a failed attach, command returns with "ERROR" or with

"+CME ERROR: unknown" after 385 seconds (timer T3310 expired).

If the MT is attached but is not able to activate a context for more than 160 seconds (timer T3380 expired), com-

mand returns with "ERROR" or with "+CME ERROR: unspecified GPRS error. In this case AT+CEER returns

"+CEER: 51,3,0".

Parameter Description

Indicates the state of PDP context activation.

0 detached

[1] attached

PDP Context Identifier is a numeric parameter which specifies a particular PDP context definition. The param-

eter is local to the TE-MT interface and is used in other PDP context-related commands.

1...2

Notes

• ATH will deactivate any PDP context.

• If the MT is in dedicated mode, write command returns with "+CME ERROR: operation temporary not

allowed".

• A maximum of 2 contexts can be activated at the same time, no matter on which interface. Trying to activate

more than 2 contexts will cause "+CME ERROR: operation temporary not allowed". Note that, depending on

the provider, the number of activated contexts may be further restricted. In such cases "+CME ERROR:

unspecified GPRS error" will be returned and

AT+CEER returns "+CEER: 50,26,0".

Remember that contexts may be activated implicitly by using the

ATD*98# or ATD*99# GPRS compatibility

commands without specifying a

<cid>.

<state>

(num)

<cid>

(num)

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Siemens MC55 Manuel d'utilisateur Page 244