MC55 AT Command Set
12.11 AT+CNMI
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MC55_ATC_V01.05 Page 333 of 469 2/10/04
Confidential / Released
• Parameters <mt>=2,3 and <ds>=1 are only available with GSM phase 2+ (see AT+CSMS=1). Incoming SMs
or Status Reports have to be acknowledged with
AT+CNMA=0 when using these phase 2+ parameters.
• Due to GSM 03.38 the ME treats short messages with message class 0 as though there was no message
class, i.e. it will ignore bits 0 and 1 in the TP-DCS and normal rules for memory capacity exceeded shall apply.
• To allow SMS overflow presentation during data transfers via Break, use
AT+CNMI=3,1 (see AT^SMGO).
• Requirements specific to Multiplex mode:
In multiplex mode (
AT+CMUX=0) only one channel can use a phase 2+ parameter. The parameter for <mt>
and <ds> on the other channels have to be set to zero. If either a SM or a Status Report is not acknowledged,
all
AT+CNMI parameter in all channels will be set to zero.
• Handling of Class 0 short messages: If the host application is provided with a display and
AT^SSDA=1 has
been set Class 0 short messages can be displayed immediately. If the host application does not include a
display, ME handles Class 0 short messages as though there was no message class, i.e. it will ignore bits 0
and 1 in the
<dcs> and normal rules for exceeded memory capacity shall apply. This approach is compliant
with GSM 03.38 .
• The parameters
<ra> and <tora> will only be displayed if <ra> of the AT^SSCONF command is set to 1.
• If either a SM or a Status Report is not acknowledged, all
AT+CNMI parameter in all channels will be set to
zero.
• If the ME operates on different instances (MUX channels 1, 2, 3 or ASC0/ASC1) avoid different settings for
routing and indicating SMS. For example, if messages shall be routed directly to one instance of the TE (set
with
AT+CNMI, AT^SSDA), it is not possible to activate the presentation of URCs with AT+CMER or AT+CNMI
on another instance. Any attempt to activate settings that conflict with existing settings on another interface,
will result in CME ERROR, or accordingly CMS ERROR.
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