AT commands interface guide - ARC Elect

1 AT CommandsGSM Reference GuideWireless Modem FamilyInterface GuideAT commands interface User GuideMulti-Tech Systems, Inc. PN S000293A 2 GSM AT commands Reference GuideProducts: Wireless Modem Family, including MTCBA-G-F1/F2, MTMMC-G-F1/F2, and MTSMC-G-F1/F2PN S000293A, Revision ACopyrightThis publication may not be reproduced, in whole or in part, without prior expressed writtenpermission from Multi-Tech Systems, Inc. All rights reserved.

2 Copyright 2003, by Multi-TechSystems, Systems, Inc. makes no representations or warranties with respect to the contents hereofand specifically disclaims any implied warranties of merchantability or fitness for any particularpurpose. Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and tomake changes from time to time in the content hereof without obligation of Multi-Tech Systems, notify any person or organization of such revisions or Level DateDescriptionA07/15/03 Initial Multi-Tech logo is a trademark of Multi-Tech Systems, commands interface User GuideMulti-Tech Systems, Inc.

3 PN S000293A 3 ContentsChapter 1 - Introduction ..4 Chapter 2 - AT commands Features ..5 Chapter 3 General be haviors ..6 Chapter 4 - General commands ..8 Chapter 5 - Call Control 6 - Network service 7 - Security commands ..38 Chapter 8 - Phonebook 9 - Short Messages 10 - Supplementary Services 11 - Data 12 - Fax 13 - Fax Class 2 14 - V24-V25 commands ..107 Chapter 15 - Specific AT 16 - SIM TOOLKIT ..157 Chapter 17 - GPRS commands .

4 172 Chapter 18 - Other AT commands ..196 Appendix A: B: Data / commands multiplexing C: AT Command D: ME SIM ToolKit E: Structure of TERMINAL PROFILE ..226 APPENDIX F: Command Type and Next Action Indicator..229 APPENDIX G: Coding of Alpha fields in the SIM for H: Specification of Power Down Control via RS232 ..232 APPENDIX I: Conditions for command execution and dependence to SIM ..233 Chapter 1 IntroductionMulti-Tech Systems, Inc. PN S000293A 4 CHAPTER 1 - INTRODUCTIONS cope of this documentThis document describes the AT-command based messages exchanged between an applicationand the MULTI-TECH products in order to manage GSM related events or documentsThis interface specification is based on the following recommendations:[1] ETSI GSM : Digital cellular telecommunications system (Phase 2).

5 Use of DTE-DCE interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)[2] ETSI GSM : Digital cellular telecommunications system (Phase 2);AT command set for GSM mobile Equipment (ME)[3] ITU-T Recommendation ter: Serial asynchronous automatic dialing and control[4] ETSI GSM : Digital cellular telecommunications system (Phase 2);Technical implementation of the Short Message Service (SMS) Point-to-Point (PP)[5] ETSI GSM : Digital cellular telecommunications system (Phase 2);Alphabets and language-specific information[6] ETSI GSM : Digital cellular telecommunications system (Phase 2).

6 mobile radio interface layer 3, Supplementary service specification, Formats and codingDefinitionsThe words, mobile Station (MS) or mobile Equipment (ME) are used for mobile terminalssupporting GSM call from a GSM mobile station to the PSTN is called a mobile originated call (MOC) or outgoing call , and a call from a fixed network to a GSM mobile station is called a mobileterminated call (MTC) or incoming call .In this document, the word product refers to any Multi-Tech product supporting the ATcommands 2 AT commands FeaturesMulti-Tech Systems, Inc.

7 PN S000293A 5 CHAPTER 2 - AT commands FEATURESM ulti-Tech line settingsA serial link handler is set with the following default values (factory settings): autobaud, 8 bitsdata, 1 stop bit, no parity, RTS/CTS flow control. Please use the +IPR, +IFC and +ICFcommands to change these lineCommands always start with AT (which means ATtention) and finish with a <CR> responses and result codesResponses start and end with <CR> <LF>, except for the ATV0 DCE response format) and theATQ1 (result code suppression) commands .

8 If command syntax is incorrect, an ERROR string is returned. If command syntax is correct but with some incorrect parameters, the +CME ERROR:<Err> or +CMS ERROR: <SmsErr> strings are returned with different error codes. If the command line has been performed successfully, an OK string is some cases, such as AT+CPIN? or (unsolicited) incoming events, the product does notreturn the OK string as a the following examples <CR> and <CR> <LF> are intentionally 3 General BehaviorsMulti-Tech Systems, Inc. PN S000293A 6 CHAPTER 3 GENERAL BE HAVIORSSIM Insertion, SIM RemovalSIM card Insertion and Removal procedures are supported.

9 There are software functions relyingon positive reading of the hardware SIM detect pin. This pin state (open/closed) is the SIM detect pin indicates that a card is present in the SIM connector, the product triesto set up a logical SIM session. The logical SIM session will be set up or not depending onwhether the detected card is a SIM Card or not. The AT+CPIN? command delivers the followingresponses: If the SIM detect pin indicates absent , the response to AT+CPIN? is +CME ERROR 10 (SIM not inserted). If the SIM detect pin indicates present , and the inserted Card is a SIM Card, the res-ponse to AT+CPIN?

10 Is +CPIN: xxx depending on SIM PIN state. If the SIM detect pin indicates present , and the inserted Card is not a SIM Card, theresponse to AT+CPIN? is CME ERROR 10. These last two states are not given immediately due to background initialization. Betweenthe hardware SIM detect pin indicating present and the previous results the AT+CPIN?sends +CME ERROR: 515 (Please wait, init in progress).When the SIM detect pin indicates card absence, and if a SIM Card was previously inserted, anIMSI detach procedure is performed, all user data is removed from the product (Phonebooks,SMS etc.)