Siemens MC55 manual Mobile

MC55 AT Command Set

12.11 AT+CNMI

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•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.

MC55_ATC_V01.05	Page 333 of 469	2/10/04
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