Siemens MC55 AT User Manual
1
AT Command Manual
for
Brodersen Products with Siemens MC55
Modem Engine
V. 04.00 / April 2006 / Doc 40232
Brodersen Controls A/S ● Industrivej 3 ● DK-4000 Roskilde ● Tel: +45 46 74 00 00 ● Fax: +45 46 75 73 36
E-mail: bc@brodersencontrols.com ● Internet: www.brodersencontrols.com
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General Notes
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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
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MC55 AT Command Set
04.00
March 17, 2006
MC55_ATC_V04.00
Confidential / Released
Copyright
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.
Copyright © Siemens AG 2006
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Contents
1. Introduction............................................................................................................................................ 13
1.1 Scope of the document ................................................................................................................. 13
1.2 Related documents ....................................................................................................................... 14
1.3 Document conventions.................................................................................................................. 15
1.3.1 Quick reference table..................................................................................................... 15
1.3.2 Superscript notation for parameters and values ............................................................ 16
1.4 AT Command Syntax .................................................................................................................... 17
1.4.1 Using Parameters .......................................................................................................... 17
1.4.2 Combining AT commands on the same command line ................................................. 18
1.5 Supported character sets .............................................................................................................. 19
1.5.1 GSM alphabet tables and UCS2 character values ........................................................ 21
1.5.2 UCS2 and GSM data coding and conversion for SMS text mode ................................. 23
1.5.2.1 Implementing output of SIM data to Terminal (direction TA to TE) ................................ 23
1.5.2.2 Implementing input of Terminal data to SIM (direction TE to TA)................................... 24
1.6 Serial Interface Flow Control ......................................................................................................... 25
1.6.1 Software Flow Control (XON/OFF Handshake)............................................................. 25
1.6.2 Hardware Flow Control (RTS/CTS Handshake) ............................................................ 25
1.7 Unsolicited Result Code Presentation........................................................................................... 26
1.7.1 Communication between Customer Application and MC55 .......................................... 26
1.8 Common PCN Handset Specification (CPHS) .............................................................................. 27
1.9 Errors and Messages .................................................................................................................... 28
2. Configuration Commands..................................................................................................................... 29
2.1 AT&F Set all current parameters to manufacturer defaults ......................................................... 29
2.2 AT&V Display current configuration ............................................................................................30
2.2.1 AT&V responses............................................................................................................ 31
2.3 AT&W Stores current configuration to user defined profile ......................................................... 32
2.4 ATQ Set result code presentation mode ..................................................................................... 33
2.5 ATV Set result code format mode ...............................................................................................34
2.5.1 Verbose and numeric result codes ................................................................................ 34
2.6 ATX Set CONNECT result code format and call monitoring ....................................................... 35
2.7 ATZ Set all current parameters to user defined profile................................................................ 36
2.8 AT+CFUN Set phone functionality .............................................................................................. 37
2.8.1 Wake up the ME from SLEEP mode ............................................................................. 40
2.9 AT^SMSO Switch off mobile station............................................................................................ 42
2.10 AT+GCAP Request complete TA capabilities list........................................................................ 43
2.11 AT+CMEE Mobile Equipment Error Message Format ................................................................ 44
2.11.1 CME/CMS Error Code Overview ................................................................................... 45
2.12 AT+CSCS Select TE character set ............................................................................................. 49
2.13 AT^SCFG Extended Configuration Settings ............................................................................... 50
2.14 AT^SM20 Set M20 compatibility mode ....................................................................................... 59
3. Status Control Commands ................................................................................................................... 60
3.1 AT+CMER Mobile Equipment Event Reporting .......................................................................... 60
3.2 AT+CIND Indicator control .......................................................................................................... 62
3.3 AT^SIND Extended Indicator Control.......................................................................................... 65
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3.4 AT+CEER Extended Error Report............................................................................................... 71
3.4.1 Cause Location ID for the extended error report ........................................................... 72
3.4.2 GSM release cause for L3 Radio Resource (RR).......................................................... 73
3.4.3 SIEMENS release cause for L3 Radio Resource (RR).................................................. 73
3.4.4 GSM release cause for Mobility Management (MM) or Session Management (SM)..... 74
3.4.5 SIEMENS release cause for L3 Mobility Management (MM) ........................................ 75
3.4.6 GSM release cause for L3 Call Control (CC)................................................................. 75
3.4.7 SIEMENS release cause for L3 Call Control (CC)......................................................... 77
3.4.8 SIEMENS release cause for L3 Advice of Charge (AOC) ............................................. 77
3.4.9 GSM Release cause for Supplementary Service Call ................................................... 77
3.4.10 SIEMENS release cause for Call-related Supplementary Services (CRSS) ................. 79
3.4.11 SIEMENS release cause for Session Management (SM) ............................................. 80
3.4.12 GSM cause for L3 Protocol module or other local cause ............................................. 80
3.4.13 SIEMENS release cause for GPRS API ........................................................................ 80
3.4.14 SIEMENS release cause for PPP/IP-Stack ................................................................... 80
3.5 ATS18 Extended call release report............................................................................................81
3.6 AT+CPAS Mobile equipment activity status................................................................................ 83
3.7 AT+WS46 Select wireless network ............................................................................................. 84
4. Serial Interface Control Commands..................................................................................................... 85
4.1 AT\Q Flow control........................................................................................................................ 85
4.2 AT&C Set Data Carrier Detect (DCD) Line mode ....................................................................... 86
4.3 AT&D Set circuit Data Terminal Ready (DTR) function mode..................................................... 87
4.4 AT&S Set circuit Data Set Ready (DSR) function mode ............................................................. 88
4.5 ATE Enable command echo........................................................................................................ 89
4.6 AT+ILRR Set TE-TA local rate reporting..................................................................................... 90
4.7 AT+IPR Set fixed local rate ......................................................................................................... 92
4.7.1 Autobauding................................................................................................................... 93
4.8 AT+CMUX Enter multiplex mode ................................................................................................ 95
4.8.1 Restrictions on Multiplex mode...................................................................................... 96
4.8.2 Second serial interface ASC1........................................................................................ 98
5. Security Commands .............................................................................................................................. 99
5.1 AT+CPIN PIN Authentication ...................................................................................................... 99
5.1.1 What to do if PIN or password authentication fails? .................................................... 101
5.2 AT+CPIN2 PIN2 Authentication ................................................................................................ 103
5.3 AT^SPIC Display PIN counter...................................................................................................105
5.4 AT+CLCK Facility lock .............................................................................................................. 109
5.5 AT^SLCK Facility lock ............................................................................................................... 114
5.6 AT+CPWD Change Password .................................................................................................. 115
5.7 AT^SPWD Change Password................................................................................................... 119
6. Identification Commands.................................................................................................................... 120
6.1 ATI Display product identification information ........................................................................... 120
6.2 AT+CGMI Request manufacturer identification......................................................................... 121
6.3 AT+GMI Request manufacturer identification ........................................................................... 121
6.4 AT+CGMM Request model identification .................................................................................. 122
6.5 AT+GMM Request model identification..................................................................................... 122
6.6 AT+CGMR Request revision identification of software status................................................... 123
6.7 AT+GMR Request revision identification of software status ..................................................... 123
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6.8 AT+CGSN Request International Mobile Equipment Identity (IMEI) ......................................... 124
6.9 AT+GSN Request International Mobile Equipment Identity (IMEI) ........................................... 124
6.10 AT+CIMI Request International Mobile Subscriber Identity (IMSI)............................................ 125
7. Call related Commands....................................................................................................................... 126
7.1 Call Status Information ................................................................................................................ 126
7.2 ATA Answer a call ..................................................................................................................... 127
7.3 ATD Mobile originated call to specified number........................................................................ 128
7.4 ATD><mem><n> Mobile originated call using specific memory and index number ................. 130
7.5 ATD><n> Mobile originated call from active memory using index number ............................... 132
7.6 ATD><str> Mobile originated call from active memory using corresponding field .................... 133
7.7 ATDI Mobile originated call to ISDN number............................................................................. 134
7.8 ATDL Redial last number used ................................................................................................. 135
7.9 ATH Disconnect existing connection......................................................................................... 136
7.10 AT+CHUP Hang up call ............................................................................................................ 137
7.11 ATS0 Set number of rings before automatically answering a call ............................................. 138
7.12 ATS6 Set pause before blind dialing ......................................................................................... 139
7.13 ATS7 Set number of seconds to wait for connection completion .............................................. 140
7.14 ATS8 Set number of seconds to wait for comma dialing modifier............................................. 141
7.15 ATS10 Set disconnect delay after indicating the absence of data carrier ................................. 142
7.16 ATO Switch from command mode to data mode / PPP online mode........................................ 143
7.17 +++ Switch from data mode to command mode ....................................................................... 144
7.18 AT+CBST Select bearer service type ....................................................................................... 145
7.19 AT+CRLP Select radio link protocol parameters for originated non-transparent data calls...... 146
7.20 AT+CLCC List current calls of ME ............................................................................................ 147
7.21 AT^SLCC Siemens defined command to list current calls of ME.............................................. 149
7.22 AT+CR Service reporting control ..............................................................................................155
7.23 AT+CRC Set Cellular Result Codes for incoming call indication .............................................. 156
7.24 AT+CSNS Single Numbering Scheme...................................................................................... 157
7.25 AT^SCNI List Call Number Information ..................................................................................... 158
7.26 AT^SLCD Display Last Call Duration ........................................................................................ 159
7.27 AT^STCD Display Total Call Duration....................................................................................... 160
7.28 ATP Select pulse dialing ........................................................................................................... 161
7.29 ATT Select tone dialing ............................................................................................................. 161
8. Network Service Commands .............................................................................................................. 162
8.1 AT+COPN Read operator names ............................................................................................. 162
8.2 AT+COPS Operator Selection .................................................................................................. 163
8.3 AT^SOPS Extended Operator Selection................................................................................... 166
8.4 AT+CREG Network registration ................................................................................................ 168
8.5 AT+CSQ Signal quality ............................................................................................................. 171
8.6 AT^SMONC Cell Monitoring......................................................................................................172
8.7 AT^SMOND Cell Monitoring......................................................................................................174
8.8 AT^MONI Monitor idle mode and dedicated mode ................................................................... 177
8.8.1 AT^MONI responses.................................................................................................... 178
8.8.2 Service states .............................................................................................................. 179
8.9 AT^MONP Monitor neighbour cells ........................................................................................... 180
8.9.1 AT^MONP responses .................................................................................................. 181
8.10 AT^SMONG GPRS Monitor ...................................................................................................... 182
8.10.1 AT^SMONG Cell Info Table......................................................................................... 183
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8.11 AT^SALS Alternate Line Service...............................................................................................184
8.12 AT^SHOM Display Homezone .................................................................................................. 186
8.13 AT^SPLM Read the PLMN list .................................................................................................. 187
8.14 AT+CPOL Preferred Operator List ............................................................................................ 188
8.15 AT^SPLR Read entry from the preferred operators list............................................................. 189
8.16 AT^SPLW Write an entry to the preferred operators list ........................................................... 190
9. Supplementary Service Commands .................................................................................................. 191
9.1 AT+CACM Accumulated call meter (ACM) reset or query ........................................................ 191
9.2 AT^SACM Advice of charge and query of ACM and ACMmax ................................................. 192
9.3 AT+CAMM Accumulated call meter maximum (ACMmax) set or query.................................... 194
9.4 AT+CAOC Advice of Charge information.................................................................................. 195
9.5 AT+CCUG Closed User Group ................................................................................................. 196
9.6 AT+CCFC Call forwarding number and conditions control ....................................................... 198
9.7 AT+CCWA Call Waiting ............................................................................................................ 202
9.8 AT+CHLD Call Hold and Multiparty........................................................................................... 206
9.9 AT+CLIP Calling Line Identification Presentation ..................................................................... 208
9.10 AT+CLIR Calling line identification restriction ........................................................................... 210
9.11 AT+COLP Connected Line Identification Presentation ............................................................. 211
9.12 AT+CPUC Price per unit and currency table............................................................................. 213
9.13 AT+CSSN Supplementary service notifications ........................................................................ 215
9.14 AT+CUSD Supplementary service notifications........................................................................ 217
10. Internet Service Commands ............................................................................................................... 219
10.1 AT^SICS Internet Connection Setup Profile.............................................................................. 222
10.1.1 Example: Default values of a CSD connection profile ................................................. 224
10.1.2 Example: GPRS connection profile ............................................................................. 225
10.2 AT^SICI Internet Connection Information.................................................................................. 226
10.2.1 Checking Connection Profile Status ............................................................................ 227
10.3 AT^SISS Internet Service Setup Profile .................................................................................... 228
10.4 AT^SISI Internet Service Information ........................................................................................ 237
10.5 AT^SISO Internet Service Open ............................................................................................... 239
10.5.1 Example: Accepting / Rejecting Socket Connection Request from Remote Client ..... 242
10.6 AT^SISC Internet Service Close ...............................................................................................244
10.7 AT^SISR Internet Service Read Data ....................................................................................... 245
10.7.1 Example: Socket Host Reads Small Amounts of UDP Data Packets (URC Mode)..... 246
10.8 AT^SISW Internet Service Write Data....................................................................................... 248
10.8.1 Usage of parameter <eodFlag> ................................................................................... 250
10.9 AT^SISE Internet Service Error Report..................................................................................... 251
10.10 Internet Service URC "^SIS" ....................................................................................................... 252
10.10.1 Information Elements Related to the Service Application............................................ 253
10.10.2 Information Elements Related to FTP Service............................................................. 254
10.10.3 Information Elements Related to HTTP Service .......................................................... 255
10.10.4 Information Elements Related to POP3 Service .......................................................... 255
10.10.5 Information Elements Related to SMTP Service ......................................................... 255
10.11 Examples of how to Configure and Use Internet Service Profiles............................................... 256
10.11.1 Selecting URC Mode or Polling Mode ......................................................................... 256
10.11.2 Configuring Socket Listener......................................................................................... 256
10.11.3 Configuring Socket Client for Calling a Socket Listener on Another Host ................... 257
10.11.4 Socket Client Sends Data via TCP Connection (Polling Mode)................................... 257
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10.11.5 Socket client sends data via TCP connection with URCs............................................ 258
10.11.6 Configuring and Using FTP Download (URC Mode) ................................................... 258
10.11.7 Configuring and Using FTP Upload (URC Mode) ........................................................ 259
10.11.8 Configuring SMPT Service Profile ............................................................................... 259
10.11.9 Sending Email (URC Mode) ........................................................................................ 260
10.11.10 Sending Email (Polling Mode) ..................................................................................... 261
10.11.11 Configuring POP3 Service Profile................................................................................ 262
10.11.12 Retrieving Email (URC Mode) ..................................................................................... 262
10.11.13 Retrieving Email (Polling Mode) .................................................................................. 263
10.11.14 HTTP POST (Polling Mode) ........................................................................................ 264
10.11.15 HTTP GET (Polling Mode) ........................................................................................... 265
11. GPRS Commands ................................................................................................................................ 266
11.1 AT+CGACT PDP context activate or deactivate ....................................................................... 266
11.2 AT+CGANS Manual response to a network request for PDP context activation ...................... 268
11.3 AT+CGATT GPRS attach or detach ......................................................................................... 270
11.4 AT+CGAUTO Automatic response to a network request for PDP context activation ............... 271
11.5 AT+CGEREP GPRS event reporting ........................................................................................ 273
11.6 AT+CGDATA Enter data state .................................................................................................. 275
11.6.1 Automatic deactivation of PDP context during dial-up PPP......................................... 276
11.7 AT+CGDCONT Define PDP Context ........................................................................................ 277
11.8 AT+CGPADDR Show PDP address ......................................................................................... 279
11.9 AT+CGQMIN Quality of Service Profile (Minimum acceptable) ................................................ 280
11.10 AT+CGQREQ Quality of Service Profile (Requested) .............................................................. 284
11.11 AT+CGREG GPRS Network Registration Status...................................................................... 288
11.12 AT+CGSMS Select service for MO SMS messages ................................................................. 290
11.13 AT^SGAUTH Set type of authentication for PPP connection.................................................... 291
11.14 AT^SGCONF Configuration of GPRS related Parameters ...................................................... 292
11.15 ATA Manual response to a network request for PDP context activation................................... 293
11.16 ATD*99# Request GPRS service.............................................................................................. 294
11.17 ATD*98# Request GPRS IP service ......................................................................................... 295
11.18 ATH Manual rejection of a network request for PDP context activation.................................... 296
11.19 ATS0 Automatic response to a network request for PDP context activation............................. 297
11.20 Using GPRS AT commands (Examples)..................................................................................... 298
11.21 Using the GPRS dial command ATD .......................................................................................... 300
12. FAX Commands ................................................................................................................................... 301
12.1 FAX parameters .......................................................................................................................... 301
12.1.1 Summary of Fax Class 2 URCs defined by EIA PN-2388 ........................................... 303
12.2 AT+FBADLIN Bad Line Threshold ............................................................................................ 304
12.3 AT+FBADMUL Error Threshold Multiplier ................................................................................. 305
12.4 AT+FBOR Query data Bit Order ............................................................................................... 306
12.5 AT+FCIG Query or set the Local Polling ID .............................................................................. 307
12.6 AT+FCLASS Fax: Select, read or test service class................................................................. 308
12.7 AT+FCQ Copy Quality Checking .............................................................................................. 309
12.8 AT+FCR Capability to Receive .................................................................................................310
12.9 AT+FDCC Query or set capabilities .......................................................................................... 311
12.10 AT+FDFFC Data Compression Format Conversion ................................................................. 312
12.11 AT+FDIS Query or set session parameters .............................................................................. 313
12.12 AT+FDR Begin or continue phase C Data Reception ............................................................... 314
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12.13 AT+FDT Data Transmission...................................................................................................... 315
12.14 AT+FET End a page or document ............................................................................................ 316
12.15 AT+FK Kill operation, orderly FAX abort ................................................................................... 317
12.16 AT+FLID Query or set the Local Id setting capabilities ............................................................. 318
12.17 AT+FMDL Identify Product Model ............................................................................................ 319
12.18 AT+FMFR Request Manufacturer Identification........................................................................ 320
12.19 AT+FOPT Set bit Order independently ..................................................................................... 321
12.20 AT+FPHCTO DTE Phase C Response Timeout....................................................................... 322
12.21 AT+FREV Identify Product Revision ......................................................................................... 323
12.22 AT+FRH Receive Data Using HDLC Framing .......................................................................... 324
12.23 AT+FRM Receive Data ............................................................................................................. 325
12.24 AT+FRS Receive Silence.......................................................................................................... 326
12.25 AT+FTH Transmit Data Using HDLC Framing.......................................................................... 327
12.26 AT+FTM Transmit Data............................................................................................................. 328
12.27 AT+FTS Stop Transmission and Wait....................................................................................... 329
12.28 AT+FVRFC Vertical Resolution Format Conversion ................................................................. 330
13. Short Message Service (SMS) Commands........................................................................................ 331
13.1 SMS parameters ......................................................................................................................... 331
13.2 AT+CMGC Send an SMS command......................................................................................... 335
13.3 AT+CMGD Delete short message............................................................................................. 336
13.4 AT+CMGF Select SMS message format .................................................................................. 337
13.5 AT+CMGL List SMS messages from preferred store................................................................ 338
13.6 AT+CMGR Read SMS messages............................................................................................. 340
13.7 AT+CMGS Send Short Message .............................................................................................. 342
13.8 AT+CMGW Write Short Messages to Memory ......................................................................... 344
13.9 AT+CMSS Send short messages from storage ........................................................................ 346
13.10 AT+CNMA New Message Acknowledgement to ME/TE, only phase 2+ .................................. 347
13.11 AT+CNMI New short Message Indication ................................................................................. 348
13.12 AT+CPMS Preferred SMS message storage............................................................................ 351
13.13 AT+CSCA SMS Service Center Address .................................................................................. 353
13.14 AT+CSCB Select Cell Broadcast Message Indication .............................................................. 354
13.15 AT+CSDH Show SMS text mode parameters........................................................................... 355
13.16 AT+CSMP Set SMS text Mode Parameters.............................................................................. 356
13.17 AT+CSMS Select Message Service.......................................................................................... 358
13.18 AT^SLMS List SMS Memory Storage ....................................................................................... 360
13.19 AT^SMGL List Short Messages from preferred store without setting status to REC READ ..... 361
13.20 AT^SMGO Set or query SMS overflow presentation mode or query SMS overflow ................. 362
13.21 AT^SMGR Read short message without setting status to REC READ..................................... 364
13.22 AT^SSCONF SMS Command Configuration ........................................................................... 365
13.23 AT^SSDA Set SMS Display Availability .................................................................................... 366
13.24 AT^SSMSS Set Short Message Storage Sequence ................................................................. 367
14. SIM related Commands ....................................................................................................................... 368
14.1 AT+CRSM Restricted SIM Access ............................................................................................ 368
14.2 AT^SXSM Extended SIM Access.............................................................................................. 370
14.3 AT^SCKS Query SIM and Chip Card Holder Status ................................................................. 372
14.4 AT^SCID Display SIM card identification number ..................................................................... 374
14.5 AT+CXXCID Display card ID..................................................................................................... 375
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15. SIM Application Toolkit (SAT) Commands ........................................................................................ 376
15.1 AT^SSTA SAT Interface Activation ........................................................................................... 376
15.2 ^SSTN SAT Notification ............................................................................................................ 378
15.3 AT^SSTGI SAT Get Information ............................................................................................... 379
15.4 AT^SSTR SAT Response .........................................................................................................380
16. Phonebook Commands....................................................................................................................... 381
16.1 Sort Order for Phonebooks ......................................................................................................... 381
16.2 AT+CPBR Read from Phonebook............................................................................................. 382
16.3 AT+CPBS Select phonebook memory storage ......................................................................... 385
16.4 AT+CPBW Write into Phonebook ............................................................................................. 387
16.5 AT^SPBC Find first matching entry in sorted phonebook ......................................................... 390
16.6 AT^SPBD Purge phonebook memory storage.......................................................................... 391
16.7 AT^SPBG Display phonebook entries in alphabetical order ..................................................... 392
16.8 AT^SPBS Step through the selected phonebook alphabetically............................................... 395
16.9 AT+CNUM Read own numbers................................................................................................. 399
16.10 AT^SDLD Delete the 'last number redial' memory .................................................................... 400
17. Audio Commands ................................................................................................................................ 401
17.1 Audio programming model .......................................................................................................... 401
17.2 ATL Set monitor speaker loudness ........................................................................................... 402
17.3 ATM Set monitor speaker mode................................................................................................ 402
17.4 AT+CLVL Loudspeaker volume level........................................................................................ 403
17.5 AT+CMUT Mute control ............................................................................................................ 404
17.6 AT+VTD Tone duration ............................................................................................................. 405
17.7 AT+VTS DTMF and tone generation......................................................................................... 406
17.8 AT^SAIC Audio Interface Configuration .................................................................................... 407
17.9 AT^SNFA Set or query of microphone attenuation .................................................................. 409
17.10 AT^SNFD Set audio parameters to manufacturer default values ............................................. 411
17.11 AT^SNFI Set microphone path parameters .............................................................................. 412
17.12 AT^SNFM Set microphone audio path and power supply......................................................... 413
17.13 AT^SNFO Set audio output (= loudspeaker path) parameter ................................................... 415
17.14 AT^SNFPT Set progress tones .................................................................................................417
17.15 AT^SNFS Select audio hardware set........................................................................................ 418
17.16 AT^SNFTTY Signal TTY/CTM audio mode capability............................................................... 421
17.17 AT^SNFV Set loudspeaker volume........................................................................................... 422
17.18 AT^SNFW Write audio setting in non-volatile store .................................................................. 423
17.19 AT^SRTC Ring tone configuration ............................................................................................ 424
18. Hardware related Commands ...................................................................................................
18.1 AT+CCLK Real Time Clock....................................................................................................... 426
18.2 AT+CALA Set alarm time ......................................................................................................... 427
18.3 AT^SBC Battery Charge Control............................................................................................... 430
18.3.1 Responses returned by read command....................................................................... 432
18.4 AT^SBV Battery/Supply Voltage ............................................................................................... 433
18.5 AT^SCTM Set critical operating temperature presentation mode or query temperature........... 434
18.6 AT^SSYNC Configure SYNC Pin.............................................................................................. 437
18.6.1 ME status indicated by status LED patterns ................................................................ 438
19. Miscellaneous Commands.................................................................................................................. 439
19.1 A/ Repeat previous command line ............................................................................................ 439
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.......... 426
19.2 ATS3 Set command line termination character......................................................................... 440
19.3 ATS4 Set response formatting character .................................................................................. 441
19.4 ATS5 Write command line editing character ............................................................................. 442
20. Appendix .............................................................................................................................................. 443
20.1 Restricted access to SIM data after SIM PIN authentication....................................................... 443
20.2 Star-Hash (*#) Network Commands............................................................................................ 444
20.3 Available AT Commands and Dependency on SIM PIN ............................................................. 447
20.4 Availability of AT Commands Depending on Operating Mode of ME.......................................... 454
20.5 AT Command Settings storable with AT&W................................................................................ 461
20.6 Factory Default Settings Restorable with AT&F.......................................................................... 464
20.7 Summary of Unsolicited Result Codes (URC)............................................................................. 467
20.8 Alphabetical List of AT Commands ............................................................................................. 470
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List of Tables
Table 1.1: Symbols used to mark the type of parameters ...........................................................................16
Table 1.2: Symbols used to indicate the correlations with other commands ............................................... 16
Table 1.3: Symbols used to mark different types of default values of parameters ..................................... 16
Table 1.4: Types of AT commands and responses .................................................................................... 17
Table 1.5: Examples for character definitions depending on alphabet ........................................................ 20
Table 2.1: Current configuration on ASC0 / MUX channel 1 (example) ...................................................... 31
Table 2.2: Current configuration on ASC1 and MUX channels 2 and 3 (example) .................................... 31
Table 2.3: Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes ................................................. 40
Table 2.4: General "CME ERROR" Codes (GSM 07.07) .......................................................................... 45
Table 2.5: General "CME ERROR" Codes (SIEMENS) ............................................................................ 46
Table 2.6: GPRS related "CME ERROR" Codes (GSM 07.07) ................................................................. 46
Table 2.7: SMS related "CMS ERROR" Codes (GSM 07.05) ................................................................... 46
Table 4.1: Availability of AT Commands on Virtual Channels .................................................................... 96
Table 4.2: Summary of AT commands with Different Behavior in Multiplex Mode ..................................... 97
Table 10.1: Applicability of AT^SICS <conParmTag> values ................................................................... 222
Table 10.2: Applicability of AT^SISS <srvParmTag> values ................................................................... 228
Table 12.1: Summary of Fax Class 2 URCs defined by EIA PN-2388 ........................................................ 303
Table 18.1: Modes of the LED and indicated ME functions......................................................................... 438
Table 20.1: Star-Hash (*#) Command Overview ........................................................................................ 444
Table 20.2: Abbreviations of Codes and Parameters used in Table 20.1 .................................................. 445
Table 20.3: Star-Hash Command Response Parameters .......................................................................... 446
Table 20.4: Star-Hash Commands for Supplementary Services ................................................................ 446
Table 20.5: Available AT Commands and Dependency on SIM PIN........................................................... 447
Table 20.6: Availability of AT Commands Depending on Operating Mode of ME ....................................... 454
Table 20.7: Settings Stored to User Profile on ASC0 / MUX Channel 1...................................................... 461
Table 20.8: Settings Stored to User Profile on ASC1 / MUX Channels 2 and 3.......................................... 462
Table 20.9: Factory Default Settings Restorable with AT&F ....................................................................... 464
Table 20.10: Summary of Unsolicited Result Codes (URC) .......................................................................... 467
Table 20.11: Alphabetical List of AT Commands........................................................................................... 470
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List of Figures
Figure 1.1: Main character table of GSM 03.38 alphabet ............................................................................. 21
Figure 1.2: Extension character table of GSM 03.38 alphabet ..................................................................... 22
Figure 17.1: Audio programming model for MC55 Module ........................................................................... 401
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1. Introduction
1.1 Scope of the document
This document presents the AT Command Set for the Siemens Cellular Engine
MC55 Release 04.00.
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] MC55 Release Notes, Version 04.00
[2] MC55 Hardware Interface Description, Version 04.00
[3] GPRS Startup User's Guide
[4] Remote-SAT User's Guide
[5] Multiplexer User's Guide
[6] Multiplex Driver Developer's Guide for Windows 2000 and Windows XP
[7] Multiplex Driver Installation Guide for Windows 2000 and Windows XP
[8] Application Note 02: Audio Interface Design
[9] Application Note 16: Updating MC55 Firmware
[10] Application Note 24: Application Developer's Guide
[11] Application Note 22: Using TTY / CTM equipment with MC55
[12] ISO/IEC10646: "Universal Multiple-Octet Coded Character Set (UCS)"; UCS2, 16 bit coding
[13] ITU-T Recommendation V.24: List of definitions for interchange circuits between data terminal equipment
(DTE) and data circuit-terminating equipment (DCE)
[14] ITU-T Recommendation V.250: Serial asynchronous automatic dialling and control
[15] 3GPP TS 100 918/EN 300 918 (GSM 02.04): General on supplementary services
[16] 3GPP TS 100 907 (GSM 02.30): Man-Machine Interface (MMI) of the Mobile Station (MS)
[17] 3GPP TS 23.038 (GSM 03.38): Alphabets and language specific information
[18] 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)
[19] 3GPP TS 27.007 (GSM 07.07): AT command set for User Equipment (UE)
[20] 3GPP TS 27.060 (GSM 07.60): Mobile Station (MS) supporting Packet Switched Services
[21] 3GPP TS 51.011 (GSM 11.11): Specification of the Subscriber Identity Module - Mobile Equipment (SIM -
ME) interface
[22] 3GPP TS 11.14 (GSM 11.14): Specification of the SIM Application Toolkit for the Subscriber Identity Module
- Mobile Equipment (SIM - ME) interface
[23] 3GPP TS 22.101 (GSM 22.101): Service principles
[24] Common PCN Handset Specification (CPHS) v4.2
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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 20.3, 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
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
% Yes
! No
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.
Example:
PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge Last
! % % § § § % ! !
by using the Multiplexer protocol. Usage is the same on ASC0 and MUX1.
Is the AT command supported in ALARM mode?
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1.3.2 Superscript notation for parameters and values
Table 1.1: Symbols used to mark the type of parameters
Parameter type Meaning
<param>
<param>
Table 1.2: Symbols used to indicate the correlations with other commands
Parameter option Meaning
<param>
<param>
<param>
<param>
Table 1.3: Symbols used to mark different types of default values of parameters
Value option Meaning
[x] Default value: if the parameter is omitted, the value 'x' will be assumed
(&F)
x
(P)
x
(D)
x
(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)
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
AT+CFUN=5
OK
AT+CFUN?
+CFUN: 5
OK
AT+CFUN=
OK
+CFUN: 1
OK
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Query current setting
Set only the middle parameter
Query new setting
Activate CYCLIC SLEEP mode, don't reset ME
Query ME mode
Set ME back to normal (default parameters: 1,0)
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 used 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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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
ò 08 BSP \08 5C 30 38
@ 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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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.
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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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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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1.5.2.2 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 convertedinto 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 of the input/output buffer should be set to approximately 60% of the total buffer size. The Low
Watermark is recommended to be about 30%. The data flow should be stopped when the 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.
During Multiplex mode (AT+CMUX) it is recommended to use hardware flow control.
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 High Watermark is reached, CTS is set inactive until the transfer from the buffer
has completed. When the Low Watermark is passed, CTS goes active again.
To achieve smooth data flow, ensure that the RTS/CTS lines are present on your application platform. The application should include options to enable RTS/CTS handshake with the GSM engine. This needs to be done with
the AT command AT\Q3 - it is not sufficient to set RTS/CTS handshake in the used Terminal program only.
The default setting of the GSM engine 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 the GSM engine
was switched off.
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.
RTS/CTS hardware handshake must also be set if you want to take advantage of the CYCLIC SLEEP modes.
For further details refer to AT+CFUN.
Note: After deactivating the RTS line, the ME may still send up to 264 bytes (worst case). This can be easily
handled if the buffer of the host application is sufficiently sized, and if a hysteresis is implemented regarding its
Rx buffer. For host applications that are required to handle a large amount of data at high speed, a total buffer
capacity of 512 bytes is recommended.
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1.7 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 20.7, 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 MC55, for details refer to [5] 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" and the Fax Class 2 URCs listed in Section 12.1, FAX parameters.
If autobauding is enabled (as factory default mode or set with AT+IPR=0), URCs generated after restart will be
output with 57600 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 4.7.1, Autobauding. To avoid problems we recommend to configure a fixed bit rate rather than using autobauding.
1.7.1 Communication between Customer Application and MC55
Leaving hardware flow control unconsidered the Customer Application (TE) is coupled with the MC55 (ME) via
a receive and a transmit line.
Since both lines are driven by independent devices collisions may (and will) happen, i.e. while the TE issues an
AT command the MC55 starts sending an URC. This will probably lead to the TE's misinterpretation 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 MC55 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 MC55 using activated echo (ATE1), i.e. the MC55 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 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
AT+CRSM
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1.9 Errors and Messages
The command result codes "+CME ERROR: <err>" and "+CMS ERROR: <err>" indicate errors related to mobile
equipment or network functionality.
The format of <err> can be either numeric or verbose and is selectable via AT+CMEE.
A result error code terminates the execution of the command and prevents the execution of all remaining commands that may follow on the same command line. If so, neither "ERROR" nor "OK" result codes are returned
for these commands. A 30 seconds timeout will deliver "ERROR" when the input of a command is not complete.
Using the wrong command syntax may result in errors: For example, using the execute command syntax
although the command has no execute format, causes "ERROR" to be returned. Likewise, using the write command syntax although the command has no write format causes "+CME ERROR: <err>" to be returned.
See also:
• Section 2.11.1, CME/CMS Error Code Overview
• Section 2.5.1, Verbose and numeric result codes
• Section 3.4, AT+CEER
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2. Configuration Commands
The AT Commands described in this chapter allow the external application to determine the MC55's behaviour
under various conditions.
2.1 AT&F Set all current parameters to manufacturer defaults
AT&F sets all current parameters to the manufacturer defined profile. All defined GPRS contexts which are not
activated or not online will be undefined (see AT+CGDCONT).
Syntax
Exec Command
AT&F[<value>]
Response(s)
OK
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge Last
V.250 ! % % % % % ! ! !
Parameter Description
<value>
[0] Set all TA parameters to manufacturer defaults
(num)
Notes
• List of parameters reset to manufacturer default can be found in Section 20.6, Factory Default Set-
tings Restorable with AT&F.
• In addition to the default profile, you can store an individual one with AT&W. To alternate between the two profiles enter either ATZ (loads user profile) or AT&F (restores factory profile).
• Every ongoing or incoming call will be terminated.
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2.2 AT&V Display current configuration
AT&V returns the current parameter setting. The configuration varies depending on whether or not PIN authen-
tication has been done and whether or not Multiplex mode is enabled (see AT+CMUX).
Syntax
Exec Command
AT&V[<value>]
Response(s)
ACTIVE PROFILE:
... (see Section 2.2.1, AT&V responses)
OK
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge Last
V.250 ! % § % § § ! ! !
Parameter Description
<value>
(num)
[0] Profile number
Notes
• The parameters of AT^SMGO can only be displayed after the SMS data from the SIM have been read successfully for the first time. Reading starts after successful SIM authentication has been performed, and may take
up to 30 seconds depending on the SIM used. While the read process is in progress, an attempt to read the
parameter will result in empty values.
• The parameter of AT+CSDH will only be displayed in SMS PDU mode, see AT+CMGF.
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