Siemens MC55 AT User Manual

0 (0)

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

Document Name:	MC55 AT Command Set
	MC55 AT Command Set
Version:	04.00
Date:	March 17, 2006
DocId:	MC55_ATC_V04.00
Status	Confidential / Released

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.

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.

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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.............................................................................................................			426
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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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

1.1Scope 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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1.2Related 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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1.3Document 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).

1.3.1Quick 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 Multiplexer 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.

Is the AT command supported in ALARM mode?

%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

! % % § § § % ! !

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1.3.2Superscript notation for parameters and values

Table 1.1: Symbols used to mark the type of parameters

Parameter type		Meaning
<param>(num)		Parameter value must be numeric type
<param>(str)		Parameter value must be string type
Table 1.2:	Symbols used to indicate the correlations with other commands

Parameter option		Meaning
<param>(&W)		Parameter value will be stored with AT&W
<param>(&V)		Parameter value will be displayed with AT&V
<param>(ˆSNFW)		Parameter value will be stored with AT^SNFW
<param>(+CSCS)		Parameter value has to be (is) coded according to current setting of <chset> (see
		AT+CSCS for details)
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
x(&F)		Factory default value, will be restored to 'x' with AT&F
x(P)		Powerup default value of a parameter which is not stored at power down
x(D)		Delivery default value of a parameter which cannot be restored automatically

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1.4AT 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>". Throughout this document, only the responses are presented, <CR><LF> are omitted intentionally.

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.

1.4.1Using 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?	Query current setting
+CCUG: 1,10,1
OK	Set only the middle parameter
AT+CCUG=,9	Set only the middle parameter
OK	Query new setting
AT+CCUG?	Query new setting
+CCUG: 1,9,1
OK
Example 2: Using default parameter values for optional parameters
AT+CFUN=5	Activate CYCLIC SLEEP mode, don't reset ME
OK	Query ME mode
AT+CFUN?	Query ME mode
+CFUN: 5
OK	Set ME back to normal (default parameters: 1,0)
AT+CFUN=	Set ME back to normal (default parameters: 1,0)

OK +CFUN: 1 OK

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1.4.2Combining 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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1.5Supported 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	GSM character	Corresponding	ASCII	Hex Esc
character	hex. value	ASCII character	Esc sequence	sequence
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.

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1.5.1GSM 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).

1.5.2UCS2 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.

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

Used character set	DCS = 7 bit	DCS = 8 bit	DCS = 16 bit
	GSM	Data	UCS2
GSM	Case 1	Case 2	Case 3
	GSM (1:1)	8 bit to IRA (1:2)	UCS2 to IRA (2:4)
UCS2	Case 4	Case 5	Case 6
	GSM to IRA (1:4)	8 bit to IRA (1:4)	UCS2 to IRA (2:4)

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"

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

Used character set	DCS = 7 bit	DCS = 8 bit	DCS = 16 bit
	GSM	Data	UCS2
GSM	Case 1	Case 2	Case 3
	GSM (1:1)	IRA to 8 bit (2:1)	IRA to 16 bit (4:2)
UCS2	Case 4	Case 5	Case 6
	UCS2 to GSM (4:1)	UCS2 to 8 bit (4:1)	UCS2 to 16 bit (4:2)

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

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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1.6Serial 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.

1.6.1Software 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.

1.6.2Hardware 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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1.7Unsolicited 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.

1.7.1Communication 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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1.8Common 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	Indicate the receipt of a short message coded as Voice Mes-	AT^SIND,
Indication	sage Waiting Indicator as defined by the CPHS Phase 2	AT+CMER, indicators
	standard.	"vmwait1" and
		"vmwait2"
Operator (Service pro-	Read specific Elementary Files (6F14h, 6F18h) from SIM.	AT+CRSM
vider) name from SIM
Network and Service Pro-	Lock/Unlock an ME to specific HPLMN and service provider.	AT+CLCK,
vider Lock		(AT+CPIN)
Call Forwarding	Get and set diverted call status. Access specific Elementary	AT+CCFC, AT+CRSM
	File (6F13h) from SIM.
Customer Service Profile	Setting services and their menu entries depending on cus-	AT+CRSM
(CSP)	tomer profiles.
Information numbers	Hierarchically structured service numbers phonebook on	AT+CRSM
	SIM according to CPHS 4.2 (mandatory).

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1.9Errors 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.

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)

Reference(s)

ASC0

ASC1

MUX1

MUX2

MUX3

Charge

Last

V.250

! !

Parameter Description

<value>(num)

[0] Set all TA parameters to manufacturer defaults

Notes

•List of parameters reset to manufacturer default can be found in Section 20.6, Factory Default Settings 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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2.2AT&V Display current configuration

AT&V returns the current parameter setting. The configuration varies depending on whether or not PIN authentication 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)

Reference(s)

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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+ 445 hidden pages

Siemens MC55 AT User Manual

Contents

List of Tables

List of Figures

1.Introduction

1.1Scope of the document

1.2Related documents

1.3Document conventions

1.3.1Quick reference table

1.3.2Superscript notation for parameters and values

1.4AT Command Syntax

1.4.1Using Parameters

1.4.2Combining AT commands on the same command line

1.5Supported character sets

1.5.1GSM alphabet tables and UCS2 character values

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

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

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

1.6Serial Interface Flow Control

1.6.1Software Flow Control (XON/OFF Handshake)

1.6.2Hardware Flow Control (RTS/CTS Handshake)

1.7Unsolicited Result Code Presentation

1.7.1Communication between Customer Application and MC55

1.8Common PCN Handset Specification (CPHS)

1.9Errors and Messages

2.Configuration Commands

2.1 AT&F Set all current parameters to manufacturer defaults

2.2AT&V Display current configuration