User`s guide

Chapter 1 – AT Commands for Remote SIM Application Toolkit

Multi-Tech Systems, Inc. SIM Application Toolkit AT Commands (S000391C) 11

1.1.9 Using SMS-Related AT Commands

The SMS related AT commands follow the GSM 07.05 specification issued by ETSI.

Usually, an SMS is sent to the network provider containing service requests; e.g., to send the latest news.

The provider returns an SMS with the requested information.

The application running on the TA sets the parameter specifying the input and output format of the received

message.

Example

1. Set SMS text mode

AT+CMGF=1

2. Activate the display of a URC on every received SMS

AT+CNMI=1,1

3. In the case that more detailed header information shown in the text mode parameter, e.g.

SMS class, are requested use

AT+CSDH=1

(Please refer to ETSI standard GSM 03.38 for details)

4. The following output on every received SMS is generated

+CMTI: “MT”, 1 where

• The first parameter “MT” specifies the storage type of the SMS

• The second parameter contains a unique location number

The example given above explains that the incoming SMS is stored to “MT” with the location number 1. The

storage “MT” is the sum of the two physical storages “ME” (Mobile Equipment message storage) and “SM”

(SIM message storage).

5. To read the SMS data use

AT+CMGR=<location>

<location> explains the location number associated with the received SMS, e.g. 1 as mentioned in the

example above

6. To list all stored SMS use

AT+CMGL=”ALL”

7. To delete a certain SMS after reading use

AT+CMGD=<location>

Remote-SAT User's Guide

1.1.10 Sequence Scenarios

In the following sequence diagrams, dashed lines refer to events responding to a formerly issued request.

1.1.10.1 Initialization Sequence

SAT starts in the RESET state when the module powers up. If the SIM application starts, SAT returns to the OFF

state.

Issuing the AT^SSTA command activates SAT and specifies the alphabet to be used. SAT then returns to the

IDLE state where it is ready for use. In IDLE state, SAT can receive input from the TA, such as forms of the

AT^SSTR command.