Siemens AC75 User Manual

AC75

Siemens Cellular Engine

Version: 01.002 DocId: AC75_ATC_V01.002

AT Command Set

AC75 AT Command Set

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General Notes

Product is deemed accepted by recipient and is provided without interface to recipient’s products. The documentation and/or product are provided for testing, evaluation, integration and information purposes. The documentation and/or product are provided on an “as is” basis only and may contain deficiencies or inadequacies. The documentation and/or product are provided without warranty of any kind, express or implied. To the maximum extent permitted by applicable law, Siemens further disclaims all warranties, including without limitation any implied warranties of merchantability, completeness, fitness for a particular purpose and non-infringement of thirdparty rights. The entire risk arising out of the use or performance of the product and documentation remains with recipient. This product is not intended for use in life support appliances, devices or systems where a malfunction of the product can reasonably be expected to result in personal injury. Applications incorporating the described product must be designed to be in accordance with the technical specifications provided in these guidelines. Failure to comply with any of the required procedures can result in malfunctions or serious discrepancies in results. Furthermore, all safety instructions regarding the use of mobile technical systems, including GSM products, which also apply to cellular phones must be followed. Siemens or its suppliers shall, regardless of any legal theory upon which the claim is based, not be liable for any consequential, incidental, direct, indirect, punitive or other damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information or data, or other pecuniary loss) arising out the use of or inability to use the documentation and/or product, even if Siemens has been advised of the possibility of such damages. The foregoing limitations of liability shall not apply in case of mandatory liability, e.g. under the German Product Liability Act, in case of intent, gross negligence, injury of life, body or health, or breach of a condition which goes to the root of the contract. However, claims for damages arising from a breach of a condition, which goes to the root of the contract, shall be limited to the foreseeable damage, which is intrinsic to the contract, unless caused by intent or gross negligence or based on liability for injury of life, body or health. The above provision does not imply a change on the burden of proof to the detriment of the recipient. Subject to change without notice at any time. The interpretation of this general note shall be governed and construed according to German law without reference to any other substantive law.

AC75 AT Command Set

01.002

October 30, 2006

AC75_ATC_V01.002

Confidential / Released

Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its contents and communication thereof to others without express authorization are prohibited. Offenders will be held liable for payment of damages. All rights created by patent grant or registration of a utility model or design patent are reserved.

Trademark notice

Bluetooth™ is a registered trademark of Bluetooth SIG Inc.

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Contents

1. Introduction............................................................................................................................................ 14

1.1 Scope of the document ................................................................................................................. 14

1.2 Related documents ....................................................................................................................... 15

1.3 Document conventions.................................................................................................................. 16

1.3.1 Quick reference table..................................................................................................... 16

1.3.2 Superscript notation for parameters and values ............................................................ 17

1.4 AT Command Syntax .................................................................................................................... 18

1.4.1 Using Parameters .......................................................................................................... 18

1.4.2 Combining AT commands on the same command line ................................................. 19

1.5 Supported character sets .............................................................................................................. 20

1.5.1 GSM alphabet tables and UCS2 character values ........................................................ 22

1.5.2 UCS2 and GSM data coding and conversion for SMS text mode ................................. 24

1.5.2.1 Implementing output of SIM data to Terminal (direction TA to TE) ................................ 24

1.5.2.2 Implementing input of Terminal data to SIM (direction TE to TA)................................... 25

1.6 Serial Interface Flow Control ......................................................................................................... 26

1.6.1 Software Flow Control (XON/OFF Handshake)............................................................. 26

1.6.2 Hardware Flow Control (RTS/CTS Handshake) ............................................................ 26

1.7 Communication between Customer Application and AC75........................................................... 28

1.8 Unsolicited Result Code Presentation........................................................................................... 29

1.9 Common PCN Handset Specification (CPHS) .............................................................................. 30

1.10 Errors and Messages .................................................................................................................... 31

2. Configuration Commands..................................................................................................................... 32

2.1 AT&F Set all current parameters to manufacturer defaults ......................................................... 32

2.2 AT&V Display current configuration ............................................................................................33

2.2.1 AT&V responses............................................................................................................ 34

2.3 AT&W Stores current configuration to user defined profile ......................................................... 36

2.4 ATQ Set result code presentation mode ..................................................................................... 37

2.5 ATV Set result code format mode ...............................................................................................38

2.5.1 Verbose and numeric result codes ................................................................................ 38

2.6 ATX Set CONNECT result code format and call monitoring ....................................................... 39

2.7 AT\V Set CONNECT result code format ..................................................................................... 40

2.8 ATZ Set all current parameters to user defined profile................................................................ 41

2.9 AT+CFUN Set phone functionality .............................................................................................. 42

2.9.1 Wake up the ME from SLEEP mode ............................................................................. 44

2.10 AT^SMSO Switch off mobile station............................................................................................46

2.11 AT+GCAP Request complete TA capabilities list........................................................................ 47

2.12 AT+CMEE Mobile Equipment Error Message Format ................................................................ 48

2.12.1 CME/CMS Error Code Overview ................................................................................... 49

2.13 AT+CSCS Select TE character set ............................................................................................. 54

2.14 AT^SCFG Extended Configuration Settings ............................................................................... 55

2.15 AT^SM20 Set M20 compatibility mode ....................................................................................... 79

3. Status Control Commands ................................................................................................................... 80

3.1 AT+CMER Mobile Equipment Event Reporting .......................................................................... 80

3.2 AT+CIND Indicator control .......................................................................................................... 82

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3.3 AT^SIND Extended Indicator Control.......................................................................................... 85

3.4 AT+CEER Extended Error Report............................................................................................... 92

3.4.1 Cause Location ID for the extended error report ........................................................... 93

3.4.2 SIEMENS L2 cause ....................................................................................................... 94

3.4.3 GSM release cause for L3 Radio Resource (RR).......................................................... 94

3.4.4 SIEMENS release cause for L3 Radio Resource (RR).................................................. 94

3.4.5 GSM release cause for Mobility Management (MM) or Session Management (SM)..... 95

3.4.6 SIEMENS release cause for L3 Mobility Management (MM) ........................................ 96

3.4.7 GSM release cause for L3 Call Control (CC)................................................................. 96

3.4.8 SIEMENS release cause for L3 Call Control (CC)......................................................... 98

3.4.9 GSM Release cause for Supplementary Service Call ................................................... 98

3.4.10 GSM release cause for Session Management (SM) ..................................................... 99

3.4.11 GSM cause for L3 Protocol module or other local cause ........................................... 100

3.4.12 SIEMENS release cause for GPRS API ...................................................................... 100

3.4.13 SIEMENS release cause for PPP/IP-Stack ................................................................. 100

3.5 ATS18 Extended call release report.......................................................................................... 101

3.6 AT+CPAS Mobile equipment activity status.............................................................................. 103

3.7 AT+WS46 Select wireless network ........................................................................................... 104

4. Serial Interface Control Commands................................................................................................... 105

4.1 AT\Q Flow control...................................................................................................................... 105

4.2 AT&C Set Data Carrier Detect (DCD) Line mode ..................................................................... 106

4.3 AT&D Set circuit Data Terminal Ready (DTR) function mode................................................... 107

4.4 AT&S Set circuit Data Set Ready (DSR) function mode ........................................................... 108

4.5 ATE Enable command echo...................................................................................................... 109

4.6 AT+ICF Serial Interface Character Framing.............................................................................. 110

4.7 AT+IFC Set Flow Control separately for data directions ........................................................... 112

4.8 AT+ILRR Set TE-TA local rate reporting................................................................................... 114

4.9 AT+IPR Set fixed local rate ....................................................................................................... 116

4.9.1 Autobauding................................................................................................................. 117

4.10 AT+CMUX Enter multiplex mode .............................................................................................. 119

4.10.1 Restrictions on Multiplex mode .................................................................................... 120

4.10.2 Second serial interface ASC1...................................................................................... 122

4.11 AT^STPB Transmit Parity Bit (for 7E1 and 7O1 only) ............................................................... 123

5. Security Commands ............................................................................................................................ 124

5.1 AT+CPIN PIN Authentication ....................................................................................................124

5.1.1 What to do if PIN or password authentication fails? .................................................... 126

5.2 AT+CPIN2 PIN2 Authentication ................................................................................................ 128

5.3 AT^SPIC Display PIN counter...................................................................................................130

5.4 AT+CLCK Facility lock .............................................................................................................. 134

5.5 AT^SLCK Facility lock ............................................................................................................... 139

5.6 AT+CPWD Change Password .................................................................................................. 140

5.7 AT^SPWD Change Password................................................................................................... 144

5.8 AT^SCSL Customer SIM Lock .................................................................................................. 146

6. Identification Commands.................................................................................................................... 150

6.1 ATI Display product identification information ........................................................................... 150

6.2 AT+CGMI Request manufacturer identification......................................................................... 151

6.3 AT+GMI Request manufacturer identification ........................................................................... 151

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6.4 AT+CGMM Request model identification .................................................................................. 152

6.5 AT+GMM Request model identification..................................................................................... 152

6.6 AT+CGMR Request revision identification of software status................................................... 153

6.7 AT+GMR Request revision identification of software status ..................................................... 153

6.8 AT+CGSN Request International Mobile Equipment Identity (IMEI) ......................................... 154

6.9 AT+GSN Request International Mobile Equipment Identity (IMEI) ........................................... 154

6.10 AT+CIMI Request International Mobile Subscriber Identity (IMSI)............................................ 155

7. Call related Commands....................................................................................................................... 156

7.1 Call Status Information ................................................................................................................ 156

7.2 ATA Answer a call ..................................................................................................................... 157

7.3 ATD Mobile originated call to specified number........................................................................ 158

7.4 ATD><mem><n> Mobile originated call using specific memory and index number ................. 160

7.5 ATD><n> Mobile originated call from active memory using index number ............................... 162

7.6 ATD><str> Mobile originated call from active memory using corresponding field .................... 163

7.7 ATDI Mobile originated call to ISDN number............................................................................. 164

7.8 ATDL Redial last number used ................................................................................................. 165

7.9 ATH Disconnect existing connection......................................................................................... 166

7.10 AT+CHUP Hang up call ............................................................................................................ 167

7.11 AT^SHUP Hang up call(s) indicating a specific GSM04.08 release cause ............................... 168

7.12 ATS0 Set number of rings before automatically answering a call ............................................. 170

7.13 ATS6 Set pause before blind dialing ......................................................................................... 171

7.14 ATS7 Set number of seconds to wait for connection completion .............................................. 172

7.15 ATS8 Set number of seconds to wait for comma dialing modifier............................................. 173

7.16 ATS10 Set disconnect delay after indicating the absence of data carrier ................................. 174

7.17 ATO Switch from command mode to data mode / PPP online mode........................................ 175

7.18 +++ Switch from data mode to command mode ....................................................................... 176

7.19 AT+CBST Select bearer service type ....................................................................................... 177

7.20 AT+CRLP Select radio link protocol parameters for originated non-transparent data calls ...... 179

7.21 AT+CLCC List current calls of ME ............................................................................................ 180

7.22 AT^SLCC Siemens defined command to list current calls of ME.............................................. 182

7.23 AT+CR Service reporting control ..............................................................................................187

7.24 AT+CRC Set Cellular Result Codes for incoming call indication .............................................. 188

7.25 AT+CSNS Single Numbering Scheme...................................................................................... 189

7.26 AT^SCNI List Call Number Information..................................................................................... 190

7.27 AT^SLCD Display Last Call Duration ........................................................................................ 191

7.28 AT^STCD Display Total Call Duration....................................................................................... 192

7.29 ATP Select pulse dialing ........................................................................................................... 193

7.30 ATT Select tone dialing ............................................................................................................. 193

8. Network Service Commands .............................................................................................................. 194

8.1 AT+COPN Read operator names ............................................................................................. 194

8.2 AT+COPS Operator Selection .................................................................................................. 195

8.3 AT^SOPS Extended Operator Selection................................................................................... 198

8.4 AT+CREG Network registration ................................................................................................ 200

8.5 AT+CSQ Signal quality ............................................................................................................. 203

8.6 AT^SMONC Cell Monitoring......................................................................................................204

8.7 AT^SMOND Cell Monitoring......................................................................................................206

8.8 AT^SFNUR Select the fixed network user rate ......................................................................... 209

8.9 AT^MONI Monitor idle mode and dedicated mode ................................................................... 210

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8.9.1 AT^MONI responses.................................................................................................... 211

8.9.2 Service states .............................................................................................................. 212

8.10 AT^MONP Monitor neighbour cells ........................................................................................... 213

8.10.1 AT^MONP responses .................................................................................................. 214

8.11 AT^SMONG GPRS Monitor ...................................................................................................... 215

8.11.1 AT^SMONG Cell Info Table......................................................................................... 216

8.12 AT^SALS Alternate Line Service...............................................................................................217

8.13 AT^SHOM Display Homezone .................................................................................................. 219

8.14 AT^SPLM Read the PLMN list .................................................................................................. 220

8.15 AT+CPOL Preferred Operator List ............................................................................................ 222

8.16 AT^SPLR Read entry from the preferred operators list............................................................. 223

8.17 AT^SPLW Write an entry to the preferred operators list ........................................................... 224

9. Supplementary Service Commands .................................................................................................. 225

9.1 AT+CACM Accumulated call meter (ACM) reset or query ........................................................ 225

9.2 AT^SACM Advice of charge and query of ACM and ACMmax ................................................. 226

9.3 AT+CAMM Accumulated call meter maximum (ACMmax) set or query.................................... 228

9.4 AT+CAOC Advice of Charge information.................................................................................. 229

9.5 AT+CCUG Closed User Group ................................................................................................. 230

9.6 AT+CCFC Call forwarding number and conditions control ....................................................... 232

9.7 AT+CCWA Call Waiting ............................................................................................................ 236

9.8 AT+CHLD Call Hold and Multiparty........................................................................................... 240

9.9 AT+CLIP Calling Line Identification Presentation ..................................................................... 242

9.10 AT+CLIR Calling Line Identification Restriction ........................................................................ 244

9.11 AT+COLP Connected Line Identification Presentation ............................................................. 245

9.12 AT+CPUC Price per unit and currency table............................................................................. 247

9.13 AT+CSSN Supplementary service notifications ........................................................................ 249

9.14 AT+CUSD Unstructured supplementary service data ............................................................... 251

10. Internet Service Commands ............................................................................................................... 253

10.1 AT^SICS Internet Connection Setup Profile.............................................................................. 256

10.1.1 Example: Default values of a CSD connection profile ................................................. 259

10.1.2 Example: GPRS connection profile ............................................................................. 260

10.2 AT^SICI Internet Connection Information.................................................................................. 261

10.2.1 Checking Connection Profile Status ............................................................................ 262

10.3 AT^SISS Internet Service Setup Profile .................................................................................... 263

10.4 AT^SISI Internet Service Information ........................................................................................ 272

10.5 AT^SISO Internet Service Open ............................................................................................... 274

10.5.1 Example: Accepting / Rejecting Socket Connection Request from Remote Client ..... 277

10.6 AT^SISC Internet Service Close ...............................................................................................279

10.7 AT^SISR Internet Service Read Data ....................................................................................... 280

10.7.1 Example: Socket Host Reads Small Amounts of UDP Data Packets (URC Mode)..... 282

10.8 AT^SISW Internet Service Write Data....................................................................................... 283

10.8.1 Usage of parameter <eodFlag> ................................................................................... 285

10.9 AT^SICO Internet Connection Open ......................................................................................... 287

10.10 AT^SICC Internet Connection Close......................................................................................... 289

10.11 AT^SISX Internet Service Execution......................................................................................... 290

10.11.1 Example: Ping.............................................................................................................. 292

10.12 AT^SISE Internet Service Error Report..................................................................................... 293

10.13 Internet Service URC "^SIS" ....................................................................................................... 294

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10.13.1 Information Elements Related to the Service Application............................................ 295

10.13.2 Information Elements Related to FTP Service............................................................. 296

10.13.3 Information Elements Related to HTTP Service .......................................................... 297

10.13.4 Information Elements Related to POP3 Service .......................................................... 297

10.13.5 Information Elements Related to SMTP Service ......................................................... 297

10.14 Examples of how to Configure and Use Internet Service Profiles............................................... 298

10.14.1 Selecting URC Mode or Polling Mode ......................................................................... 298

10.14.2 Configuring Socket Listener......................................................................................... 298

10.14.3 Configuring Socket Client for Calling a Socket Listener on Another Host ................... 299

10.14.4 Socket Client Sends Data via TCP Connection (Polling Mode)................................... 299

10.14.5 Socket client sends data via TCP connection with URCs............................................ 300

10.14.6 Configuring and Using FTP Download (URC Mode) ................................................... 300

10.14.7 Configuring and Using FTP Upload (URC Mode) ........................................................ 301

10.14.8 Configuring SMPT Service Profile ............................................................................... 301

10.14.9 Sending Email (URC Mode) ........................................................................................ 302

10.14.10 Sending Email (Polling Mode) ..................................................................................... 303

10.14.11 Configuring POP3 Service Profile................................................................................ 304

10.14.12 Retrieving Email (URC Mode) ..................................................................................... 305

10.14.13 Retrieving Email (Polling Mode) .................................................................................. 305

10.14.14 HTTP POST (Polling Mode) ........................................................................................ 306

10.14.15 HTTP GET (Polling Mode) ........................................................................................... 307

11. GPRS Commands ................................................................................................................................ 308

11.1 AT+CGACT PDP context activate or deactivate ....................................................................... 308

11.2 AT+CGANS Manual response to a network request for PDP context activation ...................... 310

11.3 AT+CGATT GPRS attach or detach ......................................................................................... 312

11.4 AT+CGAUTO Automatic response to a network request for PDP context activation ............... 313

11.5 AT+CGDATA Enter data state .................................................................................................. 315

11.5.1 Automatic deactivation of PDP context during dial-up PPP......................................... 316

11.6 AT+CGDCONT Define PDP Context ........................................................................................ 317

11.7 AT+CGEQMIN 3G Quality of Service Profile (Minimum acceptable) ........................................ 319

11.8 AT+CGEQREQ 3G Quality of Service Profile (Requested) ...................................................... 323

11.9 AT+CGPADDR Show PDP address ......................................................................................... 327

11.10 AT+CGQMIN Quality of Service Profile (Minimum acceptable) ................................................ 328

11.11 AT+CGQREQ Quality of Service Profile (Requested) .............................................................. 332

11.12 AT+CGREG GPRS Network Registration Status...................................................................... 336

11.13 AT+CGSMS Select service for MO SMS messages ................................................................. 338

11.14 AT^SGACT Query all PDP context activations ......................................................................... 339

11.15 AT^SGAUTH Set type of authentication for PPP connection.................................................... 341

11.16 AT^SGCONF Configuration of GPRS related Parameters ...................................................... 342

11.17 ATA Manual response to a network request for PDP context activation................................... 344

11.18 ATD*99# Request GPRS service.............................................................................................. 345

11.19 ATD*98# Request GPRS IP service ......................................................................................... 346

11.20 ATH Manual rejection of a network request for PDP context activation.................................... 347

11.21 ATS0 Automatic response to a network request for PDP context activation............................. 348

11.22 Using GPRS AT commands (Examples)..................................................................................... 349

11.23 Using the GPRS dial command ATD .......................................................................................... 351

12. FAX Commands ................................................................................................................................... 352

12.1 FAX parameters .......................................................................................................................... 352

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12.1.1 Fax Result Codes ........................................................................................................ 352

12.2 AT+FCLASS Fax: Select, read or test service class................................................................. 353

12.3 AT+FRH Receive Data Using HDLC Framing .......................................................................... 354

12.4 AT+FRM Receive Data ............................................................................................................. 355

12.5 AT+FRS Receive Silence.......................................................................................................... 356

12.6 AT+FTH Transmit Data Using HDLC Framing.......................................................................... 357

12.7 AT+FTM Transmit Data............................................................................................................. 358

12.8 AT+FTS Stop Transmission and Wait....................................................................................... 359

13. Short Message Service (SMS) Commands........................................................................................ 360

13.1 SMS parameters ......................................................................................................................... 360

13.2 AT+CMGC Send an SMS command......................................................................................... 365

13.3 AT+CMGD Delete short message............................................................................................. 366

13.4 AT+CMGF Select SMS message format .................................................................................. 367

13.5 AT+CMGL List SMS messages from preferred store................................................................ 368

13.6 AT+CMGR Read SMS messages............................................................................................. 370

13.7 AT+CMGS Send Short Message .............................................................................................. 372

13.8 AT+CMGW Write Short Messages to Memory ......................................................................... 374

13.9 AT+CMSS Send short messages from storage ........................................................................ 376

13.10 AT+CNMA New Message Acknowledgement to ME/TE, only phase 2+ .................................. 377

13.11 AT+CNMI New short Message Indication ................................................................................. 378

13.12 AT+CPMS Preferred SMS message storage............................................................................ 381

13.13 AT+CSCA SMS Service Center Address .................................................................................. 383

13.14 AT+CSCB Select Cell Broadcast Message Indication .............................................................. 384

13.15 AT+CSDH Show SMS text mode parameters........................................................................... 385

13.16 AT+CSMP Set SMS text Mode Parameters.............................................................................. 386

13.17 AT+CSMS Select Message Service.......................................................................................... 388

13.18 AT^SCML List Concatenated Short Messages from preferred store ........................................ 390

13.19 AT^SCMR Read Concatenated Short Messages ..................................................................... 391

13.20 AT^SCMS Send Concatenated Short Messages...................................................................... 392

13.21 AT^SCMW Write Concatenated Short Messages to Memory................................................... 393

13.22 AT^SLMS List SMS Memory Storage ....................................................................................... 394

13.23 AT^SMGL List Short Messages from preferred store without setting status to REC READ ..... 395

13.24 AT^SMGO Set or query SMS overflow presentation mode or query SMS overflow ................. 396

13.25 AT^SMGR Read short message without setting status to REC READ..................................... 398

13.26 AT^SSCONF SMS Command Configuration ........................................................................... 399

13.27 AT^SSDA Set SMS Display Availability .................................................................................... 400

13.28 AT^SSMSS Set Short Message Storage Sequence ................................................................. 401

14. SIM related Commands ....................................................................................................................... 402

14.1 AT+CRSM Restricted SIM Access ............................................................................................ 402

14.2 AT+CSIM Generic SIM Access ................................................................................................. 405

14.3 AT^SATR Query SIM's Answer to Reset Data.......................................................................... 407

14.4 AT^SXSM Extended SIM Access.............................................................................................. 408

14.5 AT^SCKS Query SIM and Chip Card Holder Status ................................................................. 410

14.6 AT^SSET Indicate SIM data ready............................................................................................ 412

14.7 AT^SCID Display SIM card identification number ..................................................................... 413

14.8 AT+CXXCID Display card ID..................................................................................................... 414

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15. Remote SIM Access (RSA) Commands .............................................................................................415

15.1 AT^SRSA Remote SIM Access Activation ................................................................................ 418

15.2 AT^SRSM Remote SIM Access Message ................................................................................ 422

15.2.1 SAP Request Message Parameters ............................................................................ 425

15.2.2 SAP Response Message Parameters ......................................................................... 425

15.3 Related AT Commands............................................................................................................... 426

15.3.1 Establishing an RSA Connection in a PC Environment............................................... 426

15.3.2 Bluetooth scenario (SAP) ............................................................................................ 426

15.3.3 Serial Interface Scenario (XSAP) ................................................................................ 427

16. SIM Application Toolkit (SAT) Commands........................................................................................ 428

16.1 AT^SSTA SAT Interface Activation ........................................................................................... 428

16.2 ^SSTN SAT Notification ............................................................................................................ 430

16.3 AT^SSTGI SAT Get Information ............................................................................................... 431

16.4 AT^SSTR SAT Response .........................................................................................................432

17. Phonebook Commands....................................................................................................................... 433

17.1 Sort Order for Phonebooks ......................................................................................................... 433

17.2 AT+CNUM Read own numbers................................................................................................. 434

17.3 AT+CPBR Read from Phonebook............................................................................................. 435

17.4 AT+CPBS Select phonebook memory storage ......................................................................... 438

17.5 AT+CPBW Write into Phonebook ............................................................................................. 440

17.6 AT^SPBW Write into Phonebook with location report............................................................... 443

17.7 AT^SDLD Delete the 'last number redial' memory .................................................................... 446

17.8 AT^SPBC Find first matching entry in sorted phonebook .........................................................447

17.9 AT^SPBD Purge phonebook memory storage.......................................................................... 448

17.10 AT^SPBG Display phonebook entries in alphabetical order ..................................................... 449

17.11 AT^SPBS Step through the selected phonebook alphabetically............................................... 452

18. Audio Commands ................................................................................................................................ 456

18.1 Audio programming model .......................................................................................................... 456

18.2 ATL Set monitor speaker loudness ........................................................................................... 457

18.3 ATM Set monitor speaker mode................................................................................................ 457

18.4 AT+CLVL Loudspeaker volume level........................................................................................ 458

18.5 AT+CMUT Mute control ........................................................................................................

18.6 AT+VTD Tone duration ............................................................................................................. 460

18.7 AT+VTS DTMF and tone generation......................................................................................... 461

18.8 AT^SAIC Audio Interface Configuration .................................................................................... 462

18.9 AT^SNFA Set or query of microphone attenuation .................................................................. 464

18.10 AT^SNFD Set audio parameters to manufacturer default values ............................................. 466

18.11 AT^SNFI Set microphone path parameters .............................................................................. 467

18.12 AT^SNFM Set microphone audio path and power supply......................................................... 468

18.13 AT^SNFO Set audio output (= loudspeaker path) parameter ................................................... 470

18.14 AT^SNFPT Set progress tones .................................................................................................472

18.15 AT^SNFS Select audio hardware set........................................................................................ 473

18.16 AT^SNFTTY Signal TTY/CTM audio mode capability............................................................... 476

18.17 AT^SNFV Set loudspeaker volume........................................................................................... 477

18.18 AT^SNFW Write audio setting in non-volatile store .................................................................. 478

18.19 AT^SRTC Ring tone configuration ............................................................................................ 479

.... 459

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19. Hardware Related Commands............................................................................................................ 481

19.1 AT+CCLK Real Time Clock....................................................................................................... 481

19.2 AT+CALA Set alarm time ......................................................................................................... 482

19.3 AT^SAD Antenna Diagnosis .....................................................................................................485

19.4 AT^SBC Battery Charge Control............................................................................................... 486

19.4.1 Responses returned by read command....................................................................... 488

19.5 AT^SBV Battery/Supply Voltage ............................................................................................... 489

19.6 AT^SCTM Set critical operating temperature presentation mode or query temperature........... 490

19.6.1 Deferred shutdown ...................................................................................................... 492

19.7 AT^SSYNC Configure SYNC Pin.............................................................................................. 493

19.7.1 ME status indicated by status LED patterns ................................................................ 494

19.8 AT^SSPI Serial Protocol Interface ............................................................................................496

19.8.1 Specifying Delay Time for I²C ...................................................................................... 498

19.8.2 Selecting SPI Mode ..................................................................................................... 499

19.8.3 Transmitting Data over AT Interface............................................................................ 500

19.8.3.1 Structure of Messages on the I²C Bus......................................................................... 501

19.8.3.2 Structure of Messages on the SPI ............................................................................... 502

19.8.4 Error Handling on the I²C Bus...................................................................................... 502

19.8.5 Example: Using I²C Bus............................................................................................... 504

19.8.6 Example: Transfer and Response Messages on SPI .................................................. 505

19.9 AT^SWDAC Configure and Read PWM Signal for DAC........................................................... 506

20. GPIO Commands ................................................................................................................................. 508

20.1 AT^SPIO General Purpose IO Driver Open/Close.................................................................... 508

20.2 AT^SCPIN Pin Configuration .................................................................................................... 509

20.3 AT^SCPOL Polling Configuration.............................................................................................. 511

20.4 AT^SCPORT Port Configuration ............................................................................................... 513

20.5 AT^SDPORT Delete a Port Configuration................................................................................. 514

20.6 AT^SGIO Get IO state of a specified pin or port ....................................................................... 515

20.7 AT^SSIO Set IO state of a specified pin or port ........................................................................ 516

20.8 AT^SCCNT Configure Pulse Counter ....................................................................................... 517

20.8.1 Using the Pulse Counter in Limit Counter Mode.......................................................... 518

20.9 AT^SSCNT Start and Stop Pulse Counter ................................................................................ 519

20.9.1 Using the Pulse Counter in Start-Stop Counter Mode ................................................. 520

21. Java related Commands ..................................................................................................................... 521

21.1 AT^SJRA Run Java Application ................................................................................................ 521

21.2 AT^SJNET Set Dialup Network Access Parameters................................................................. 522

21.3 AT^SJOTAP Over The Air Application Provisioning ................................................................. 525

21.4 AT^SJSEC Write Binary Java Security Data............................................................................. 527

22. Miscellaneous Commands.................................................................................................................. 529

22.1 A/ Repeat previous command line ............................................................................................ 529

22.2 ATS3 Set command line termination character......................................................................... 530

22.3 ATS4 Set response formatting character .................................................................................. 531

22.4 ATS5 Write command line editing character ............................................................................. 532

22.5 AT^SFDL Enter Firmware Download Mode .............................................................................. 533

23. Appendix .............................................................................................................................................. 535

23.1 Restricted access to SIM data after SIM PIN authentication....................................................... 535

23.2 Star-Hash (*#) Network Commands............................................................................................ 536

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Contents

23.3 Available AT Commands and Dependency on SIM PIN ............................................................. 539

23.4 Availability of AT Commands Depending on Operating Mode of ME.......................................... 546

23.5 AT Command Settings storable with AT&W................................................................................ 554

23.6 Factory Default Settings Restorable with AT&F.......................................................................... 557

23.7 Summary of Unsolicited Result Codes (URC)............................................................................. 560

23.8 Alphabetical List of AT Commands ............................................................................................. 563

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List of Tables

Table 1.1: Symbols used to mark the type of parameters ...........................................................................17

Table 1.2: Symbols used to indicate the correlations with other commands ............................................... 17

Table 1.3: Symbols used to mark different types of default values of parameters ..................................... 17

Table 1.4: Types of AT commands and responses .................................................................................... 18

Table 1.5: Examples for character definitions depending on alphabet ........................................................ 21

Table 2.1: Current configuration on ASC0 / MUX channel 1 / USB (example)............................................ 34

Table 2.2: Current configuration on ASC1 and MUX channels 2 and 3 (example) .................................... 35

Table 2.3: Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes ................................................. 45

Table 2.4: General "CME ERROR" Codes (GSM 07.07) .......................................................................... 49

Table 2.5: General "CME ERROR" Codes (SIEMENS) ............................................................................ 50

Table 2.6: GPRS related "CME ERROR" Codes (GSM 07.07) ................................................................. 50

Table 2.7: GPRS related "CME ERROR" Codes (SIEMENS) ................................................................... 50

Table 2.8: SMS related "CMS ERROR" Codes (GSM 07.05) ................................................................... 51

Table 4.1: Availability of AT Commands on Virtual Channels .................................................................. 120

Table 4.2: Summary of AT commands with Different Behavior in Multiplex Mode ................................... 121

Table 10.1: Applicability of AT^SICS <conParmTag> values ................................................................... 256

Table 10.2: Applicability of AT^SISS <srvParmTag> values ................................................................... 263

Table 12.1: Fax Result Codes ..................................................................................................................... 352

Table 19.1: Modes of the LED and indicated ME functions......................................................................... 494

Table 19.2: Values for calculating the delay................................................................................................ 498

Table 19.3: Special characters for ASCII coding ......................................................................................... 500

Table 19.4: Structure of Transfer and Response Messages on the I²C bus................................................ 501

Table 19.5: Structure of Transfer and Response Messages for SPI ........................................................... 502

Table 23.1: Star-Hash (*#) Command Overview ........................................................................................ 536

Table 23.2: Abbreviations of Codes and Parameters used in Table 23.1 .................................................. 537

Table 23.3: Star-Hash Command Response Parameters .......................................................................... 538

Table 23.4: Star-Hash Commands for Supplementary Services ................................................................ 538

Table 23.5: Available AT Commands and Dependency on SIM PIN........................................................... 539

Table 23.6: Availability of AT Commands Depending on Operating Mode of ME ....................................... 546

Table 23.7: Settings Stored to User Profile on ASC0 / MUX Channel 1...................................................... 554

Table 23.8: Settings Stored to User Profile on ASC1 / MUX Channels 2 and 3.......................................... 555

Table 23.9: Factory Default Settings Restorable with AT&F ....................................................................... 557

Table 23.10: Summary of Unsolicited Result Codes (URC) .......................................................................... 560

Table 23.11: Alphabetical List of AT Commands........................................................................................... 563

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List of Figures

Figure 1.1: Main character table of GSM 03.38 alphabet ............................................................................. 22

Figure 1.2: Extension character table of GSM 03.38 alphabet ..................................................................... 23

Figure 15.1: Basic Remote SIM Access Usage Scenario via Bluetooth ....................................................... 415

Figure 15.2: Basic Remote SIM Access usage scenario via RS232 ............................................................ 415

Figure 15.3: SIM usage states of SAP server............................................................................................... 416

Figure 15.4: SIM usage states of SAP client ................................................................................................ 417

Figure 18.1: Audio programming model for AC75 Module............................................................................ 456

Figure 19.1: Formula for calculating the delay.............................................................................................. 498

Figure 19.2: Delay time on I²C after Write .................................................................................................... 498

Figure 19.4: SPI modes selectable on SPI ................................................................................................... 499

Figure 19.3: Delay time on I²C after Read .................................................................................................... 499

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1. Introduction

1.1 Scope of the document

This document presents the AT Command Set for the Siemens Cellular Engine AC75 Release 01.002.

Before using the Cellular Engine or upgrading to a new firmware version please read the latest product information provided in the Release Notes [1].

More information is available at the Siemens Website: http://www.siemens.com/wm

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1.2 Related documents

[1] AC75 Release Notes, Version 01.002 [2] AC75 Hardware Interface Description, Version 01.002 [3] AC75 Java User's Guide [4] Remote-SAT User's Guide [5] GPRS Startup User's Guide [6] Multiplexer User's Guide [7] Multiplex Driver Developer's Guide for Windows 2000 and Windows XP [8] Multiplex Driver Installation Guide for Windows 2000 and Windows XP

[9] Application Note 02: Audio Interface Design [10] Application Note 16: Updating AC75 Firmware [11] Application Note 17: Over-The-Air Firmware Update [12] Application Note 24: Application Developer's Guide [13] Application Note 22: Using TTY / CTM equipment with AC75 [14] SIM Access Profile Interoperability Specification (Revision 1.0), issued by the Bluetooth Special Interest

Group

[15] ISO/IEC10646: "Universal Multiple-Octet Coded Character Set (UCS)"; UCS2, 16 bit coding [16] ITU-T Recommendation V.24: List of definitions for interchange circuits between data terminal equipment

(DTE) and data circuit-terminating equipment (DCE)

[17] ITU-T Recommendation V.250: Serial asynchronous automatic dialling and control [18] 3GPP TS 100 918/EN 300 918 (GSM 02.04): General on supplementary services [19] 3GPP TS 100 907 (GSM 02.30): Man-Machine Interface (MMI) of the Mobile Station (MS) [20] 3GPP TS 23.038 (GSM 03.38): Alphabets and language specific information [21] 3GPP TS 27.005 (GSM 07.05): Use of Data Terminal Equipment - Data Circuit terminating Equipment (DTE

- DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)

[22] 3GPP TS 27.007 (GSM 07.07): AT command set for User Equipment (UE) [23] 3GPP TS 27.060 (GSM 07.60): Mobile Station (MS) supporting Packet Switched Services [24] 3GPP TS 51.011 (GSM 11.11): Specification of the Subscriber Identity Module - Mobile Equipment (SIM -

ME) interface

[25] 3GPP TS 11.14 (GSM 11.14): Specification of the SIM Application Toolkit for the Subscriber Identity Module

- Mobile Equipment (SIM - ME) interface

[26] 3GPP TS 22.101 (GSM 22.101): Service principles [27] Common PCN Handset Specification (CPHS) v4.2 [28] USB.ORG: www.usb.org/developers/docs/USB_LANGIDs.pdf

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AC75 AT Command Set

1.3 Document conventions

Throughout the document, the GSM engines are referred to as ME (Mobile Equipment), MS (Mobile Station), TA (Terminal Adapter), DCE (Data Communication Equipment) or facsimile DCE (FAX modem, FAX board). To control your GSM engine you can simply send AT Commands via its serial interface. The controlling device at the other end of the serial line is referred to as TE (Terminal Equipment), DTE (Data Terminal Equipment) or plainly 'the application' (probably running on an embedded system). All abbreviations and acronyms used throughout this document are based on the GSM specifications. For definitions please refer to TR 100 350 V7.0.0 (1999-08), (GSM 01.04, version 7.0.0 release 1998).

1.3.1 Quick reference table

Each AT command description includes a table similar to the example shown below. The table is intended as a quick reference to indicate the following functions: PIN: Is the AT command PIN protected? + Yes

- No ± Usage is dependent on conditions specified for the command, or not all command types are PIN

protected (for example write command PIN protected, read command not).

Note: The table provided in Section 23.3, Available AT Commands and Dependency on SIM

PIN uses the same symbols.

ASC0: Is the AT command supported on the first physical serial interface ASC0? + Yes

- No ASC1: Is the AT command supported on the second physical serial interface ASC1? + Yes

- No USB: Is the AT command supported on the USB interface? + Yes

- No MUXn: Is the AT command usable on the Multiplexer channels MUX1, MUX2, MUX3? + Yes

- No

± AT command is usable, but under the restrictions specified in the section related to the command. Note: The columns MUX1, MUX2 and MUX3 are relevant only when the GSM engine operates in Mul-

tiplexer mode, that is, when the first physical serial interface is partitioned into 3 virtual channels by using the Multiplexer protocol. Usage is the same on ASC0 and MUX1.

+ Yes

- No ± In AIRPLANE mode, not all described functions are available. For example, the test or read com-

Charge: Is the AT command supported in CHARGE ONLY mode? + Yes

- No ± AT command is usable, but under the restrictions specified in the section related to the command. Last: If commands are concatenated, this AT command must be the last one. + Yes

- No Note: See also Section 1.4, AT Command Syntax for details on concatenated AT commands.

Is the AT command supported in AIRPLANE mode?

mand is usable, the write or execute command is not. Furthermore, only some of the listed parameters can be changed in AIRPLANE mode. A typical example is AT^SCFG that controls different features.

Example:

PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4 Last

- + + + ± ± ± + - -

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1.3 Document conventions

1.3.2 Superscript notation for parameters and values

Table 1.1: Symbols used to mark the type of parameters

Parameter type Meaning

<param>

Table 1.2: Symbols used to indicate the correlations with other commands

Parameter option Meaning

<param>

Table 1.3: Symbols used to mark different types of default values of parameters

(num)

(str)

(&W)

(&V)

(ˆSNFW)

(+CSCS)

Parameter value must be numeric type Parameter value must be string type

Parameter value will be stored with AT&W Parameter value will be displayed with AT&V Parameter value will be stored with AT^SNFW Parameter value has to be (is) coded according to current setting of <chset> (see

AT+CSCS for details)

Value option Meaning

[x] Default value: if the parameter is omitted, the value 'x' will be assumed

(&F)

(P)

(D)

Factory default value, will be restored to 'x' with AT&F Powerup default value of a parameter which is not stored at power down Delivery default value of a parameter which cannot be restored automatically

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1.4 AT Command Syntax

The "AT" or "at" prefix must be set at the beginning of each command line. To terminate a command line enter

<CR>. Commands are usually followed by a response that includes "<CR><LF><response><CR><LF>". Through-

out this document, only the responses are presented,

Table 1.4: Types of AT commands and responses

AT command type Syntax Function

Test command AT+CXXX=? The mobile equipment returns the list of parameters and value

ranges set with the corresponding Write command or by internal processes.

Read command AT+CXXX? This command returns the currently set value of the parameter or

parameters. Write command AT+CXXX=<...> This command sets user-definable parameter values. Exec(ution) command AT+CXXX The execution command reads non-variable parameters deter-

mined by internal processes in the GSM engine.

<CR><LF> are omitted intentionally.

1.4.1 Using Parameters

• Optional parameters are enclosed in square brackets. If optional parameters are omitted, the current settings are used until you change them.

• Optional parameters or subparameters can be omitted unless they are followed by other parameters. If you want to omit a parameter in the middle of a string it must be replaced by a comma. See also example 1.

• A parameter value enclosed in square brackets represents the value that will be used if an optional parameter is omitted. See also example 2.

• When the parameter is a character string, e.g. <text> or <number>, the string must be enclosed in quotation marks, e.g. "Charlie Brown" or "+49030xxxx". Symbols in quotation marks will be recognized as strings.

• All spaces will be ignored when using strings without quotaton marks.

• It is possible to omit the leading zeros of strings which represent numbers.

• If an optional parameter of a V.250 command is omitted, its value is assumed to be 0.

Example 1: Omitting parameters in the middle of a string

AT+CCUG? +CCUG: 1,10,1 OK AT+CCUG=,9 OK AT+CCUG? +CCUG: 1,9,1 OK

Example 2: Using default parameter values for optional parameters

Query current setting

Set only the middle parameter

Query new setting

AT+CFUN=7,0 OK AT+CFUN? +CFUN: 7 OK AT+CFUN= OK +CFUN: 1 OK

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Activate CYCLIC SLEEP mode, don't reset ME

Query ME mode

Set ME back to normal (default parameters: 1,0)

AC75 AT Command Set

1.4 AT Command Syntax

1.4.2 Combining AT commands on the same command line

You may enter several AT commands on the same line. This eliminates the need to type the "AT" or "at" prefix before each command. Instead, it is only needed once at the beginning of the command line. Use a semicolon as command delimiter. The table below lists the AT commands you cannot enter together with other commands on the same line. Otherwise, the responses may not be in the expected order.

AT command type Comment V.250 commands with FAX commands (Prefix AT+F) GSM 7.07 commands with Siemens commands, Prefix AT^S) GSM 7.05 commands (SMS) To be used standalone Commands starting with AT& To be used standalone

AT+IPR To be used standalone

Note: When concatenating AT commands please keep in mind that the sequence of processing may be different from the sequential order of command input. Therefore, if the consecutive order of the issued commands and the associated responses is your concern, avoid concatenating commands on the same line.

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1.5 Supported character sets

The ME supports two character sets: GSM 03.38 (7 bit, also referred to as GSM alphabet or SMS alphabet) and UCS2 (16 bit, refer to ISO/IEC 10646). See AT+CSCS for information about selecting the character set. Character tables can be found below.

Explanation of terms

• International Reference Alphabet (IRA) IRA means that one byte is displayed as two characters in hexadecimal format. For example, the byte 0x36 (decimal 54) is displayed as "36" (two characters). IRA is used here for input 8-bit or 16-bit data via terminal devices using text mode. This means only characters 'A'..F','a'..'f' and '0'..'9' are valid.

• Escape sequences The escape sequence used within a text coded in the GSM default alphabet (0x1B) must be correctly interpreted by the TE, both for character input and output. To the module, an escape sequence appears like any other byte received or sent.

• Terminal Adapter (TA) TA is an equivalent to Mobile Equipment (ME) which stands for the GSM module described here. It uses GSM default alphabet as its character set.

• Terminal Equipment (TE) TE is the device connected to the TA via serial interface. In most cases TE is an ANSI/ASCII terminal that does not fully support the GSM default alphabet, for example MS Hyperterminal.

• TE Character Set The character set currently used by Terminal Equipment is selected with AT+CSCS.

• Data Coding Scheme (dcs) DCS is part of a short message and is saved on the SIM. When writing a short message to the SIM in text mode, the dcs stored with AT+CSMP is used and determines the coded character set.

The behavior when encountering characters that are not valid characters of the supported alphabets is undefined. Due to the constraints described below it is recommended to prefer the USC2 alphabet in any external application. If the GSM alphabet is selected all characters sent over the serial line (between TE and TA) are in the range from 0 to 127 (7 Bit range). CAUTION: ASCII alphabet (TE) is not GSM alphabet (TA/ME) !

Several problems resulting from the use of GSM alphabet with ASCII terminal equipment:

• "@" character with GSM alphabet value 0 is not printable by an ASCII terminal program (e.g. Microsoft© Hyperterminal®).

• "@" character with GSM alphabet value 0 will terminate any C string! This is because the 0 is defined as C string end tag. Therefore, the GSM Null character may cause problems on application level when using a 'C'function as "strlen()". This can be avoided if it is represented by an escape sequence as shown in the table below. By the way, this may be the reason why even network providers often replace "@"with "@=*" in their SIM application.

• Other characters of the GSM alphabet are misinterpreted by an ASCII terminal program. For example, GSM "ö" (as in "Börse") is assumed to be "|" in ASCII, thus resulting in "B|rse". This is because both alphabets mean different characters with values hex. 7C or 00 and so on.

• In addition, decimal 17 and 19 which are used as XON/XOFF control characters when software flow control is activated, are interpreted as normal characters in the GSM alphabet.

When you write characters differently coded in ASCII and GSM (e.g. Ä, Ö, Ü), you need to enter escape sequences. Such a character is translated into the corresponding GSM character value and, when output later, the GSM character value can be presented. Any ASCII terminal then will show wrong responses.

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1.5 Supported character sets

Table 1.5: Examples for character definitions depending on alphabet

GSM 03.38 character

Ö 5C \ \5C 5C 35 43 " 22 " \22 5C 32 32 @ 00 NULL \00 5C 30 30

CAUTION: Often, the editors of terminal programs do not recognize escape sequences. In this case, an escape sequence will be handled as normal characters. The most common workaround to this problem is to write a script which includes a decimal code instead of an escape sequence. This way you can write, for example, short messages which may contain differently coded characters.

GSM character hex. value

Corresponding ASCII character

ASCII Esc sequence

Hex Esc sequence

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AC75 AT Command Set

1.5 Supported character sets

1.5.1 GSM alphabet tables and UCS2 character values

This section provides tables for the GSM 03.38 alphabet supported by the ME. Below any GSM character find the corresponding two byte character value of the UCS2 alphabet. (For related mapping definition see: http://www.unicode.org/Public/MAPPINGS/ETSI/GSM0338.TXT)

Figure 1.1: Main character table of GSM 03.38 alphabet

1) This code is an escape to the following extension of the 7 bit default alphabet table.

2) This code is not a printable character and therefore not defined for the UCS2 alphabet. It shall be treated as the accompanying control character.

3) As the standard GSM alphabet does not provide a backspace functionality the AC75 is designed to use the GSM character 08 (hex 0x08) as backspace. This allows the user to easily erase the last character when using an ASCII terminal. On the other hand, this solution requires entering the escape sequence \08 for writing the "ò" character in GSM alphabet.

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1.5 Supported character sets

Figure 1.2: Extension character table of GSM 03.38 alphabet

1) This code value is reserved for the extension to another extension table. On receipt of this code, a receiving entity shall display a space until another extension table is defined.

2) This code represents the EURO currency symbol. The code value is the one used for the character 'e'. Therefore a receiving entity which is incapable of displaying the EURO currency symbol will display the character 'e' instead.

3) This code is defined as a Page Break character and may be used for example in compressed CBS messages. Any mobile which does not understand the 7 bit default alphabet table extension mechanism will treat this character as Line Feed.

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1.5 Supported character sets

In the event that an MS receives a code where a symbol is not represented in Figure 1.2, Extension character

table of GSM 03.38 alphabet the MS shall display the character shown in the main default 7 bit alphabet table

(see Figure 1.1, Main character table of GSM 03.38 alphabet).

1.5.2 UCS2 and GSM data coding and conversion for SMS text mode

This section provides basic information on how to handle input and output character conversion for SMS text mode and Remote-SAT if internal (TA) and external (TE) character representation differ, i.e. if the Data Coding Scheme and the TE character use different coding.

1.5.2.1 Implementing output of SIM data to Terminal (direction TA to

TE)

Used character set DCS = 7 bit

GSM

GSM Case 1

GSM (1:1)

UCS2 Case 4

GSM to IRA (1:4)

Note: The ratio of SIM bytes to output bytes is given in parentheses.

Case 1 Every GSM character is sent to the TE as it is (8-bit value with highest bit set to zero). Example: 47'H, 53'H, 4D'H → 47'H, 53'H, 4D'H, displayed as "GSM"

Case 2 Every data byte is sent to the TE as 2 IRA characters each representing a halfbyte. Example: B8'H (184 decimal) → 42'H, 38'H, displayed as "B8"

Case 3 Every 16-bit UCS2 value is sent to the TE as 4 IRA characters. Example: C4xA7'H (50343 decimal) → 43'H, 34'H, 41'H, 37'H, displayed as "C4A7" Problem: An odd number of bytes leads to an error because there are always two bytes needed for each USC2 character

Case 4 Every GSM character is sent to the TE as 4 IRA characters to show UCS2 in text mode. Example: 41'H ("A") → 30'H, 30'H, 34'H, 31'H, displayed as "0041"

DCS = 8 bit Data

Case 2 8 bit to IRA (1:2)

Case 5 8 bit to IRA (1:4)

DCS = 16 bit UCS2

Case 3 UCS2 to IRA (2:4)

Case 6 UCS2 to IRA (2:4)

Case 5 Every data byte is sent to the TE as IRA representation of UCS2 (similar to case 4). Example: B2'H → 30'H, 30'H, 42'H, 32'H, displayed as "00B2"

Case 6 Every 16-bit value is sent to the TE as IRA representation of it. It is assumed that number of bytes is even. Example: C3x46'H → 43'H, 33'H, 34'H, 36'H, displayed as "C346"

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1.5 Supported character sets

1.5.2.2 Implementing input of Terminal data to SIM (direction TE to TA)

Used character set DCS = 7 bit

GSM

GSM Case 1

GSM (1:1)

UCS2 Case 4

UCS2 to GSM (4:1)

Note: The ratio between the number of input characters and bytes stored on the SIM is given in parentheses.

Case 1 Every character is sent from TE to TA as GSM character (or ASCII with standard terminal emulation, e.g. Hyperterminal). Character value must be in range from 0 to 127 because of 7-bit GSM alphabet. To reach maximum SMS text length of 160 characters in 140 bytes space characters will be compressed on SIM. This must be set using the parameter <dcs> of AT+CSMP (add 64). Example: "ABCDEFGH" typed is sent and stored uncompressed as → 4142434445464748'H (stored compressed as 41E19058341E91'H)

Case 2 Every data byte is sent as 2 IRA characters. Maximum text length is 280 IRA characters which will be converted into 140 bytes SMS binary user data Example: "C8" typed is sent as 43'H, 38'H → stored as C8'H

Case 3 Every 16-bit value is sent as 4 IRA characters. Maximum text length is 280 IRA characters which will be converted into 70 UCS2 characters (16-bit each) Number of IRA characters must be a multiple of four because always 4 half bytes are needed for a 16-bit value Example: "D2C8" typed is sent as 44'H, 32'H, 43'H, 38'H → stored as D2C8'H

DCS = 8 bit Data

Case 2 IRA to 8 bit (2:1)

Case 5 UCS2 to 8 bit (4:1)

DCS = 16 bit UCS2

Case 3 IRA to 16 bit (4:2)

Case 6 UCS2 to 16 bit (4:2)

Case 4 Every GSM character is sent as 4 IRA characters representing one UCS2 character. Example: To store text "ABC" using UCS2 character set you have to type "004100420043". This is sent as 30'H,30'H,34'H,31'H, 30'H,30'H,34'H,32'H, 30'H,30'H,34'H,33'H → detected as IRA representation of 3 UCS2 characters, converted to GSM character set and stored as 41'H, 42'H, 43'H. Maximum input is 640 IRA characters repesenting 160 UCS2 characters when compression is active. These are converted to 160 GSM 7-bit characters. Without compression only 140 GSM characters can be stored which are put in as 560 IRA characters. Values of UCS2 characters must be smaller than 80'H (128 decimal) to be valid GSM characters. Number of IRA characters must be a multiple of four. Problems:

• "41" → Error, there are four IRA characters (two bytes) needed

• "0000" → Error, not an UCS2 character

• "4142" → Error, value of UCS2 character > 7F'H

• "008B" → Error, value of UCS2 character > 7F'H

This affects the maximum input length of a string)

Case 5 Every UCS2 character is sent as 4 IRA characters and is converted into two 8-bit values. This means that the first two characters have to be '00'. Example: UCS2 character 009F'H typed as "009F" is sent as 30'H,30'H,39'H,46'H → converted into 8-bit value 9F'H. Maximum number of UCS2 characters is 140 which are represented by 560 IRA characters. Number of IRA characters must be a multiple of four.

Case 6 Every UCS2 character is sent as 4 IRA characters each and is converted into a 16-bit value again. Example: UCS2 character 9F3A'H typed as "9F3A" is sent as 39'H,46'H,33'H,41'H → converted into 9F3A'H. Maximum number of UCS2 characters is 70 which are represented by 280 IRA characters. Number of IRA characters must be a multiple of four. Invalid UCS2 values must be prevented.

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1.6 Serial Interface Flow Control

Flow control is essential to prevent loss of data or avoid errors when, in a data or fax call, the sending device is transferring data faster than the receiving side is ready to accept. When the receiving buffer reaches its capacity, the receiving device should be capable to cause the sending device to pause until it catches up. There are basically two approaches to regulate data flow: Software flow control and hardware flow control. The High Watermark (HWM) of the input/output buffer should be set to approximately 60% of the total buffer size, the Low Watermark (LWM) is recommended to be about 30%. The data flow should be stopped when the buffer capacity rises close to the High Watermark and resumed when it drops below the Low Watermark. The time required to cause stop and go results in a hysteresis between the High and Low Watermarks.

1.6.1 Software Flow Control (XON/OFF Handshake)

Software flow control sends different characters to stop (XOFF, decimal 19) and resume (XON, decimal 17) data flow. The only advantage of software flow control is that three wires would be sufficient on the serial interface.

1.6.2 Hardware Flow Control (RTS/CTS Handshake)

Hardware flow control sets or resets the RTS/CTS wires. This approach is faster and more reliable, and therefore, the better choice. When the HWM is reached, CTS is set inactive. When the LWM is passed, CTS goes active again. To achieve smooth data flow,ensure that the RTS/CTS lines are present on your application platform.

Configuring hardware flow control

• Hardware flow control must be set on both sides: with AT\Q3 or AT+IFC in the ME and an equivalent RTS/ CTS handshake option in the host application.

• The default setting of the ME is AT\Q0 (no flow control) which must be altered to AT\Q3 (RTS/CTS hardware handshake on). The setting is stored volatile and must be restored each time after rebooting the ME.

• AT\Q has no read command. To verify the current setting of AT\Q, simply check the settings of the active profile with AT&V.

• Often, fax programs run an intialization procedure when started up. The intialization commonly includes enabling RTS/CTS hardware handshake, eliminating the need to set AT\Q3 once again. However, before setting up a CSD call, you are advised to check that RTS/CTS handshake is set.

Buffer design considerations

• Each serial interface (ASC0 and ASC1) of the AC75 uses two buffers, one for the uplink and one for the downlink. Each buffer has a capacity of minimum 1024 bytes.

• Uplink direction (where ME is receiving data from host application): CTS control is based on the filling level of the ME's receive buffer. When the application detects that CTS is being deactivated it must instantly stop sending data to the ME's receive buffer. But still, after deactivation of CTS, the receive buffer of the ME can accept another 512 bytes.

• Downlink direction (where ME is sending data to host application): The transmit buffer of the ME can hold at least 1024 bytes. After deactivation of RTS the ME sends max. 2 more bytes and then stops transferring data to the application. The maximum time RTS can be kept inactive without losing data is determined by the buffer size and the maximum possible over-the-air data rate. In any case, the local data rate between DCE and DTE (AT+IPR) should be set to a value higher than the maximum possible over-the-air data rate.

• Buffer size recommended for the host application: Just like the ME, the host application should include send and receive buffers for each serial interface. To handle large amounts of data at high speed a buffer capacity of 1024 bytes is recommended. If the host application is designed mainly for one direction (uplink or downlink) a lower buffer size will do for the direction where less data is transferred. In fact, the optimal size of the host application buffers is a matter of finding the balance between the amount

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1.6 Serial Interface Flow Control

of data, data throughput, reaction time of the application when handling the buffer, processor performance and available memory. To give an example, a small buffer size (such as 256 bytes) increases the frequency of deactivating RTS/CTS and the frequency of flushing the buffer, thus diminishing the efficiency of the application. Also, please consider that RTS/CTS flow control cannot stop the data stream coming from the network, e.g. in a GPRS or fax connection. So the lack of appropriate hardware flow control increases the risk of losing data packets if, like in the case of UDP, the connection protocol has no or only minimum error handling functions. Other network protocols are using high level flow control mechanisms. For example, to prevent loss of data the TCP protocol uses retransmission algorithms, fax applications usually repeat the transfer of faulty pages.

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1.7 Communication between Customer Application and AC75

Leaving hardware flow control unconsidered the Customer Application (TE) is coupled with the AC75 (ME) via a receive and a transmit line. Since both lines are driven by independent devices collisions may (and will) happen. For example, if the TE issues an AT command the AC75 starts sending a URC. This will probably cause the TE to misinterpret of the URC being part of the AT command's response.

To avoid this conflict the following measures must be taken:

• If an AT command is finished (with "OK" or "ERROR") the TE shall always wait at least 100 milliseconds before sending the next one. This gives the AC75 the opportunity to transmit pending URCs and get necessary service. Note that some AT commands may require more delay after "OK" or "ERROR" response, refer to the following command specifications for details.

• The TE shall communicate with the AC75 using activated echo (ATE1), i.e. the AC75 echoes characters received from the TE. Hence, when the TE receives the echo of the first character "A" of the AT command just sent by itself it has control both over the receive and the transmit paths.

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1.8 Unsolicited Result Code Presentation

URC stands for Unsolicited Result Code and is a report message issued by the ME without being requested by the TE, i.e. a URC is issued automatically when a certain event occurs. Hence, a URC is not issued as part of the response related to an executed AT command. Typical events leading to URCs are incoming calls ("RING"), waiting calls, received short messages, changes in temperature, network registration etc. A list of all URCs can be found in Section 23.7, Summary of Unsolicited Result Codes (URC).

To announce a pending URC transmission the ME will do the following:

• The ME activates its RING line (logic "1") for 1 second, i.e. the RING line changes to the physical "Low" level. This allows the TE to stay in power saving mode until an ME related event requests service. If several URCs occur coincidently or in quick succession each URC triggers the RING line independently, although the line will not be deactivated between each URC. As a result, the RING line may stay low for more than 1 second. If an incoming call is answered within less than 1 second (with ATA or if autoanswering is set to ATS0=1) than the RING line will be deactivated earlier. The "^SHUTDOWN" URC will not activate the RING line.

• If the AT command interface is busy a "BREAK" will be sent immediately but the URC will not be issued until the line is free. This may happen if the URC is pending in the following cases:

- During the processing of an AT command (i.e. the time after the TE echoes back the first character "A" of

an AT command just sent by itself until the ME responds with "OK" or "ERROR").

- During a data call. Please note that AT command settings may be necessary to enable in-band signaling, e.g. refer to AT+CMER

or AT+CNMI.

It is strongly recommended to use the multiplex mode to map logical communication channels onto the serial line of the AC75, for details refer to [6] and AT command AT+CMUX. Doing so it is possible to use one channel to still process URCs while having a data call active on another. For most of these messages, the ME needs to be configured whether or not to send a URC. Depending on the AT command, the URC presentation mode can be saved to the user defined profile (see AT&W), or needs to be activated every time you reboot the ME. Several URCs are not user definable, such as "^SYSSTART", "^SYSSTART <text>", "^SHUTDOWN" If autobauding is enabled (AT+IPR=0), URCs generated after restart will be output with 115200 bps until the ME has detected the current bit rate. The URCs "^SYSSTART", "^SYSSTART <text>", however, are not presented at all. For details please refer to Section 4.9.1, Autobauding. To avoid problems we recommend to configure a fixed bit rate rather than using autobauding.

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1.9 Common PCN Handset Specification (CPHS)

The ME provides features to implement a device following the prerequisites of the Common PCN Handset Specification (CPHS) Phase 2.

CPHS Feature Description/Remarks AT command Alternate Line Service Using two phone numbers with one SIM card. AT^SALS Voice Message Waiting

Indication

Operator (Service provider) name from SIM

Network and Service Provider Lock

Call Forwarding Get and set diverted call status. Access specific Elementary

Customer Service Profile (CSP)

Information numbers Hierarchically structured service numbers phonebook on

Indicate the receipt of a short message coded as Voice Message Waiting Indicator as defined by the CPHS Phase 2 standard.

Read specific Elementary Files (6F14h, 6F18h) from SIM. AT+CRSM

Lock/Unlock an ME to specific HPLMN and service provider. AT+CLCK,

File (6F13h) from SIM. Setting services and their menu entries depending on cus-

tomer profiles.

SIM according to CPHS 4.2 (mandatory).

AT^SIND, AT+CMER, indicators

"vmwait1" and "vmwait2"

(AT+CPIN)

AT+CCFC, AT+CRSM

AT+CRSM

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