MC55 AT Command Set
10.1 AT+CGACT s
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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 specif ied 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 stat e
for that context remains unchanged. If the MT is not GPRS attached when the activation form of the comman d
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 activa tes/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-re lated commands.
1...2
Notes
ATH will deactivate any PDP context.
If the MT is in dedicated mode, write command returns with "+CME ERROR: operatio n 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 al lowed". 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)