XT55 AT Command Set - Wireless Data Modules

XT55 AT Command Set13.12 AT+CPMSsNotes• The Mobile Equipment storage ''ME'' offers space for 25 short messages, see .• ''MT'' is the sum of ''ME'' (= 25 locations) and ''SM'' (capacity varies with SIM card). The indices ofthe ''MT'' storage are dependent on the order selected with AT^SSMSS• The , and parameter will be stored in non-volatile memory.• The user should be aware that the setting ''MT'' involves ''ME'' and ''SM'', with ''ME'' being filled up first. If the''ME'' storage is full, XT55 will proceed with the ''SM'' storage.Incoming Class 1 short messages (ME specific) will be preferably stored to ''ME'' and may be transferred tothe ''SM'' storage if ''ME'' is used up.Incoming Class 2 messages (SIM specific) will be stored to the SIM card only, no matter whether or not thereis free ''ME'' space. As a result, the ^SMGO: 2 indication (see AT^SMGO) may be presented without prior indicationof ^SMGO: 1. For more information regarding SIM and ME specific message classes refer to and the following specifications: GSM 03.38 and 3GPP TS23038.• When is switched over from ''MT'' to ''SM'' all free ''ME'' locations will be filled with dummy short messages.This procedure can take up to 35 seconds, until all the 25 records are written.If switching from ''MT'' to ''SM'' was not finished due to error or user break, the value of remains ''MT'',but some of the dummy records remain in the ''ME'' storage. These records have to be deleted manually.When equals ''SM'', do not delete the dummy messages in the ''ME''. storage. They will be automaticallydeleted when you switch back from ''SM'' to ''MT''. Again, this may take up to 35 seconds.If switching from ''SM'' to ''MT'' was not finished due to an error or user break, the value of remains''SM'', but the ''ME'' storage will no longer be filled with dummy records. New incoming short messages maynow be written to the ''ME'' storage, if ''SM'' is already full. To avoid this, repeat the AT+CPMS command assoon as possible to switch back to ''MT''. As an alternative, you can manually delete the dummyrecords and issue AT+CPMS=MT,MT,MT.• Multiplexer: In Multiplex mode or when the two physical serial interfaces are connected, the parameter will be the same on all instances, but the settings of and may vary on each channel/ interface. As a result, changes on parameter and/or befor activating the multiplexer or differencesvalues for other instanes can result in not desired behaviours like different outputs for AT+CMGL andso on.• While equals ''SM'' and equals ''ME'' it is possible that, after deleting short messages from''ME'', the freed space on ''ME'' is reclaimed for new incoming short messages, when there is no space left onthe ''SM'' storage. As it is often the clients concern to have received short messages stored only to the SIMcard, inconsistent settings should be generally avoided. This can be achieved simply by using the sameparameter for all memory indices.• Users should be aware that when using this AT command quickly after SIM PIN authentication the SIM datamay not yet be accessible, resulting in a short delay before the requested AT command response is returned.See Section 20.1, Restricted access to SIM data after SIM PIN authentication for further detail.• The indices of the storage are dependent on the order selected with AT^SSMSS.XT55_ATC_V03.03 Page 337 of 459 9/9/05Confidential / Released