Siemens AC75 User Manual

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AC75

Siemens Cellular Engine

Version:	01.002
DocId:	AC75_ATC_V01.002

AT Command Set

AC75 AT Command Set	s

Document Name:	AC75 AT Command Set
	AC75 AT Command Set
Version:	01.002
Date:	October 30, 2006
DocId:	AC75_ATC_V01.002
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.

Trademark notice

Bluetooth™ is a registered trademark of Bluetooth SIG Inc.

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Contents

1.	Introduction............................................................................................................................................			14
	1.1	Scope of the document .................................................................................................................		14
	1.2	Related documents .......................................................................................................................		15
	1.3	Document conventions..................................................................................................................		16
		1.3.1	Quick reference table.....................................................................................................	16
		1.3.2	Superscript notation for parameters and values ............................................................	17
	1.4	AT Command Syntax ....................................................................................................................		18
		1.4.1	Using Parameters ..........................................................................................................	18
		1.4.2	Combining AT commands on the same command line .................................................	19
	1.5	Supported character sets ..............................................................................................................		20
		1.5.1	GSM alphabet tables and UCS2 character values ........................................................	22
		1.5.2	UCS2 and GSM data coding and conversion for SMS text mode .................................	24
		1.5.2.1	Implementing output of SIM data to Terminal (direction TA to TE) ................................	24
		1.5.2.2	Implementing input of Terminal data to SIM (direction TE to TA)...................................	25
	1.6	Serial Interface Flow Control .........................................................................................................		26
		1.6.1	Software Flow Control (XON/OFF Handshake).............................................................	26
		1.6.2	Hardware Flow Control (RTS/CTS Handshake) ............................................................	26
	1.7	Communication between Customer Application and AC75...........................................................		28
	1.8	Unsolicited Result Code Presentation...........................................................................................		29
	1.9	Common PCN Handset Specification (CPHS) ..............................................................................		30
	1.10	Errors and Messages ....................................................................................................................		31


2.	Configuration Commands.....................................................................................................................				32
	2.1	AT&F	Set all current parameters to manufacturer defaults .........................................................		32
	2.2	AT&V	Display current configuration ............................................................................................		33
		2.2.1	AT&V responses............................................................................................................		34
	2.3	AT&W Stores current configuration to user defined profile .........................................................			36
	2.4	ATQ	Set result code presentation mode .....................................................................................		37
	2.5	ATV	Set result code format mode ...............................................................................................		38
		2.5.1	Verbose and numeric result codes ................................................................................		38
	2.6	ATX	Set CONNECT result code format and call monitoring .......................................................		39
	2.7	AT\V	Set CONNECT result code format .....................................................................................		40
	2.8	ATZ	Set all current parameters to user defined profile................................................................		41
	2.9	AT+CFUN		Set phone functionality ..............................................................................................	42
		2.9.1	Wake up the ME from SLEEP mode .............................................................................		44
	2.10	AT^SMSO		Switch off mobile station............................................................................................	46
	2.11	AT+GCAP		Request complete TA capabilities list........................................................................	47
	2.12	AT+CMEE		Mobile Equipment Error Message Format ................................................................	48
		2.12.1 CME/CMS Error Code Overview ...................................................................................			49
	2.13	AT+CSCS		Select TE character set .............................................................................................	54
	2.14	AT^SCFG		Extended Configuration Settings ...............................................................................	55
	2.15	AT^SM20		Set M20 compatibility mode .......................................................................................	79

3.	Status Control Commands ...................................................................................................................			80
	3.1	AT+CMER	Mobile Equipment Event Reporting ..........................................................................	80
	3.2	AT+CIND	Indicator control ..........................................................................................................	82

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	3.3	AT^SIND			Extended Indicator Control..........................................................................................	85
	3.4	AT+CEER			Extended Error Report...............................................................................................	92
		3.4.1		Cause Location ID for the extended error report ...........................................................		93
		3.4.2		SIEMENS L2 cause .......................................................................................................		94
		3.4.3		GSM release cause for L3 Radio Resource (RR)..........................................................		94
		3.4.4		SIEMENS release cause for L3 Radio Resource (RR)..................................................		94
		3.4.5		GSM release cause for Mobility Management (MM) or Session Management (SM)..... 95
		3.4.6		SIEMENS release cause for L3 Mobility Management (MM) ........................................		96
		3.4.7		GSM release cause for L3 Call Control (CC).................................................................		96
		3.4.8		SIEMENS release cause for L3 Call Control (CC).........................................................		98
		3.4.9		GSM Release cause for Supplementary Service Call ...................................................		98
		3.4.10 GSM release cause for Session Management (SM) .....................................................				99
		3.4.11 GSM cause for L3 Protocol module or other local cause ...........................................				100
		3.4.12 SIEMENS release cause for GPRS API ......................................................................				100
		3.4.13 SIEMENS release cause for PPP/IP-Stack .................................................................				100
	3.5	ATS18	Extended call release report..........................................................................................			101
	3.6	AT+CPAS			Mobile equipment activity status..............................................................................	103
	3.7	AT+WS46			Select wireless network ...........................................................................................	104
4.	Serial Interface Control Commands...................................................................................................					105
	4.1	AT\Q	Flow control......................................................................................................................			105
	4.2	AT&C	Set Data Carrier Detect (DCD) Line mode .....................................................................			106
	4.3	AT&D	Set circuit Data Terminal Ready (DTR) function mode...................................................			107
	4.4	AT&S	Set circuit Data Set Ready (DSR) function mode ...........................................................			108
	4.5	ATE Enable command echo......................................................................................................				109
	4.6	AT+ICF		Serial Interface Character Framing..............................................................................		110
	4.7	AT+IFC		Set Flow Control separately for data directions ...........................................................		112
	4.8	AT+ILRR			Set TE-TA local rate reporting...................................................................................	114
	4.9	AT+IPR		Set fixed local rate .......................................................................................................		116
		4.9.1		Autobauding.................................................................................................................		117
	4.10	AT+CMUX			Enter multiplex mode ..............................................................................................	119
		4.10.1 Restrictions on Multiplex mode....................................................................................				120
		4.10.2 Second serial interface ASC1......................................................................................				122
	4.11	AT^STPB			Transmit Parity Bit (for 7E1 and 7O1 only)...............................................................	123
5.	Security Commands............................................................................................................................					124
	5.1	AT+CPIN			PIN Authentication ....................................................................................................	124
		5.1.1		What to do if PIN or password authentication fails? ....................................................		126
	5.2	AT+CPIN2			PIN2 Authentication ................................................................................................	128
	5.3	AT^SPIC			Display PIN counter...................................................................................................	130
	5.4	AT+CLCK			Facility lock ..............................................................................................................	134
	5.5	AT^SLCK			Facility lock ...............................................................................................................	139
	5.6	AT+CPWD			Change Password ..................................................................................................	140
	5.7	AT^SPWD			Change Password...................................................................................................	144
	5.8	AT^SCSL			Customer SIM Lock ..................................................................................................	146
6.	Identification Commands....................................................................................................................					150
	6.1	ATI Display product identification information ...........................................................................				150
	6.2	AT+CGMI			Request manufacturer identification.........................................................................	151
	6.3	AT+GMI		Request manufacturer identification ...........................................................................		151

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	6.4	AT+CGMM			Request model identification ..................................................................................		152
	6.5	AT+GMM		Request model identification.....................................................................................			152
	6.6	AT+CGMR			Request revision identification of software status...................................................		153
	6.7	AT+GMR		Request revision identification of software status .....................................................			153
	6.8	AT+CGSN			Request International Mobile Equipment Identity (IMEI).........................................		154
	6.9	AT+GSN		Request International Mobile Equipment Identity (IMEI) ...........................................			154
	6.10	AT+CIMI		Request International Mobile Subscriber Identity (IMSI)............................................			155
7.	Call related Commands.......................................................................................................................						156
	7.1	Call Status Information ................................................................................................................					156
	7.2	ATA	Answer a call .....................................................................................................................				157
	7.3	ATD	Mobile originated call to specified number ........................................................................				158
	7.4	ATD><mem><n> Mobile originated call using specific memory and index number .................					160
	7.5	ATD><n>		Mobile originated call from active memory using index number ...............................			162
	7.6	ATD><str>			Mobile originated call from active memory using corresponding field ....................		163
	7.7	ATDI	Mobile originated call to ISDN number.............................................................................				164
	7.8	ATDL	Redial last number used .................................................................................................				165
	7.9	ATH	Disconnect existing connection.........................................................................................				166
	7.10	AT+CHUP			Hang up call ............................................................................................................		167
	7.11	AT^SHUP		Hang up call(s) indicating a specific GSM04.08 release cause ...............................			168
	7.12	ATS0	Set number of rings before automatically answering a call .............................................				170
	7.13	ATS6	Set pause before blind dialing .........................................................................................				171
	7.14	ATS7	Set number of seconds to wait for connection completion ..............................................				172
	7.15	ATS8	Set number of seconds to wait for comma dialing modifier.............................................				173
	7.16	ATS10 Set disconnect delay after indicating the absence of data carrier .................................					174
	7.17	ATO	Switch from command mode to data mode / PPP online mode........................................				175
	7.18	+++ Switch from data mode to command mode .......................................................................					176
	7.19	AT+CBST		Select bearer service type .......................................................................................			177
	7.20	AT+CRLP		Select radio link protocol parameters for originated non-transparent data calls ......			179
	7.21	AT+CLCC		List current calls of ME ............................................................................................			180
	7.22	AT^SLCC		Siemens defined command to list current calls of ME..............................................			182
	7.23	AT+CR Service reporting control ..............................................................................................					187
	7.24	AT+CRC		Set Cellular Result Codes for incoming call indication ..............................................			188
	7.25	AT+CSNS			Single Numbering Scheme......................................................................................		189
	7.26	AT^SCNI		List Call Number Information.....................................................................................			190
	7.27	AT^SLCD		Display Last Call Duration ........................................................................................			191
	7.28	AT^STCD		Display Total Call Duration.......................................................................................			192
	7.29	ATP	Select pulse dialing ...........................................................................................................				193
	7.30	ATT	Select tone dialing .............................................................................................................				193
8.	Network Service Commands ..............................................................................................................						194
	8.1	AT+COPN			Read operator names .............................................................................................		194
	8.2	AT+COPS			Operator Selection ..................................................................................................		195
	8.3	AT^SOPS		Extended Operator Selection...................................................................................			198
	8.4	AT+CREG			Network registration ................................................................................................		200
	8.5	AT+CSQ		Signal quality .............................................................................................................			203
	8.6	AT^SMONC			Cell Monitoring......................................................................................................		204
	8.7	AT^SMOND			Cell Monitoring......................................................................................................		206
	8.8	AT^SFNUR			Select the fixed network user rate .........................................................................		209
	8.9	AT^MONI		Monitor idle mode and dedicated mode ...................................................................			210

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		8.9.1	AT^MONI responses....................................................................................................			211
		8.9.2	Service states ..............................................................................................................			212
	8.10	AT^MONP		Monitor neighbour cells ...........................................................................................		213
		8.10.1	AT^MONP responses ..................................................................................................			214
	8.11	AT^SMONG GPRS Monitor ......................................................................................................				215
		8.11.1 AT^SMONG Cell Info Table.........................................................................................				216
	8.12	AT^SALS		Alternate Line Service...............................................................................................		217
	8.13	AT^SHOM		Display Homezone ..................................................................................................		219
	8.14	AT^SPLM		Read the PLMN list ..................................................................................................		220
	8.15	AT+CPOL		Preferred Operator List ............................................................................................		222
	8.16	AT^SPLR		Read entry from the preferred operators list.............................................................		223
	8.17	AT^SPLW		Write an entry to the preferred operators list ...........................................................		224
9.	Supplementary Service Commands ..................................................................................................					225
	9.1	AT+CACM		Accumulated call meter (ACM) reset or query ........................................................		225
	9.2	AT^SACM		Advice of charge and query of ACM and ACMmax .................................................		226
	9.3	AT+CAMM		Accumulated call meter maximum (ACMmax) set or query....................................		228
	9.4	AT+CAOC		Advice of Charge information..................................................................................		229
	9.5	AT+CCUG		Closed User Group .................................................................................................		230
	9.6	AT+CCFC		Call forwarding number and conditions control .......................................................		232
	9.7	AT+CCWA		Call Waiting ............................................................................................................		236
	9.8	AT+CHLD		Call Hold and Multiparty...........................................................................................		240
	9.9	AT+CLIP		Calling Line Identification Presentation .....................................................................		242
	9.10	AT+CLIR		Calling Line Identification Restriction ........................................................................		244
	9.11	AT+COLP		Connected Line Identification Presentation .............................................................		245
	9.12	AT+CPUC		Price per unit and currency table.............................................................................		247
	9.13	AT+CSSN		Supplementary service notifications ........................................................................		249
	9.14	AT+CUSD		Unstructured supplementary service data...............................................................		251
10.	Internet Service Commands ...............................................................................................................					253
	10.1	AT^SICS		Internet Connection Setup Profile..............................................................................		256
		10.1.1 Example: Default values of a CSD connection profile .................................................				259
		10.1.2 Example: GPRS connection profile .............................................................................				260
	10.2	AT^SICI	Internet Connection Information..................................................................................			261
		10.2.1 Checking Connection Profile Status ............................................................................				262
	10.3	AT^SISS		Internet Service Setup Profile ....................................................................................		263
	10.4	AT^SISI	Internet Service Information ........................................................................................			272
	10.5	AT^SISO		Internet Service Open ...............................................................................................		274
		10.5.1 Example: Accepting / Rejecting Socket Connection Request from Remote Client .....				277
	10.6	AT^SISC		Internet Service Close ...............................................................................................		279
	10.7	AT^SISR		Internet Service Read Data .......................................................................................		280
		10.7.1 Example: Socket Host Reads Small Amounts of UDP Data Packets (URC Mode).....				282
	10.8	AT^SISW		Internet Service Write Data.......................................................................................		283
		10.8.1 Usage of parameter <eodFlag>...................................................................................				285
	10.9	AT^SICO		Internet Connection Open .........................................................................................		287
	10.10	AT^SICC		Internet Connection Close.........................................................................................		289
	10.11 AT^SISX			Internet Service Execution.........................................................................................		290
		10.11.1	Example: Ping..............................................................................................................			292
	10.12	AT^SISE		Internet Service Error Report.....................................................................................		293
	10.13 Internet Service URC "^SIS" .......................................................................................................					294

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		10.13.1 Information Elements Related to the Service Application............................................					295
		10.13.2 Information Elements Related to FTP Service.............................................................					296
		10.13.3 Information Elements Related to HTTP Service ..........................................................					297
		10.13.4 Information Elements Related to POP3 Service..........................................................					297
		10.13.5 Information Elements Related to SMTP Service .........................................................					297
	10.14	Examples of how to Configure and Use Internet Service Profiles...............................................					298
		10.14.1 Selecting URC Mode or Polling Mode .........................................................................					298
		10.14.2		Configuring Socket Listener.........................................................................................			298
		10.14.3 Configuring Socket Client for Calling a Socket Listener on Another Host ...................					299
		10.14.4 Socket Client Sends Data via TCP Connection (Polling Mode)...................................					299
		10.14.5 Socket client sends data via TCP connection with URCs............................................					300
		10.14.6 Configuring and Using FTP Download (URC Mode) ...................................................					300
		10.14.7 Configuring and Using FTP Upload (URC Mode)........................................................					301
		10.14.8 Configuring SMPT Service Profile ...............................................................................					301
		10.14.9 Sending Email (URC Mode) ........................................................................................					302
		10.14.10 Sending Email (Polling Mode) .....................................................................................					303
		10.14.11 Configuring POP3 Service Profile................................................................................					304
		10.14.12 Retrieving Email (URC Mode) .....................................................................................					305
		10.14.13 Retrieving Email (Polling Mode) ..................................................................................					305
		10.14.14 HTTP POST (Polling Mode) ........................................................................................					306
		10.14.15 HTTP GET (Polling Mode)...........................................................................................					307
11.	GPRS Commands................................................................................................................................						308
	11.1	AT+CGACT			PDP context activate or deactivate .......................................................................		308
	11.2	AT+CGANS			Manual response to a network request for PDP context activation ......................		310
	11.3	AT+CGATT GPRS attach or detach .........................................................................................					312
	11.4	AT+CGAUTO				Automatic response to a network request for PDP context activation ...............	313
	11.5	AT+CGDATA			Enter data state ..................................................................................................		315
		11.5.1 Automatic deactivation of PDP context during dial-up PPP.........................................					316
	11.6	AT+CGDCONT				Define PDP Context ........................................................................................	317
	11.7	AT+CGEQMIN				3G Quality of Service Profile (Minimum acceptable)........................................	319
	11.8	AT+CGEQREQ				3G Quality of Service Profile (Requested) ......................................................	323
	11.9	AT+CGPADDR				Show PDP address .........................................................................................	327
	11.10	AT+CGQMIN			Quality of Service Profile (Minimum acceptable) ................................................		328
	11.11	AT+CGQREQ				Quality of Service Profile (Requested) ..............................................................	332
	11.12	AT+CGREG			GPRS Network Registration Status......................................................................		336
	11.13	AT+CGSMS			Select service for MO SMS messages.................................................................		338
	11.14	AT^SGACT Query all PDP context activations .........................................................................					339
	11.15	AT^SGAUTH			Set type of authentication for PPP connection....................................................		341
	11.16	AT^SGCONF			Configuration of GPRS related Parameters ......................................................		342
	11.17	ATA	Manual response to a network request for PDP context activation...................................				344
	11.18	ATD*99#		Request GPRS service..............................................................................................			345
	11.19	ATD*98#		Request GPRS IP service .........................................................................................			346
	11.20	ATH	Manual rejection of a network request for PDP context activation....................................				347
	11.21	ATS0	Automatic response to a network request for PDP context activation.............................				348
	11.22	Using GPRS AT commands (Examples).....................................................................................					349
	11.23	Using the GPRS dial command ATD ..........................................................................................					351
12.	FAX Commands...................................................................................................................................						352
	12.1	FAX parameters ..........................................................................................................................					352

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	12.1.1	Fax Result Codes ........................................................................................................		352
12.2	AT+FCLASS Fax: Select, read or test service class.................................................................			353
12.3	AT+FRH	Receive Data Using HDLC Framing ..........................................................................		354
12.4	AT+FRM	Receive Data .............................................................................................................		355
12.5	AT+FRS	Receive Silence..........................................................................................................		356
12.6	AT+FTH	Transmit Data Using HDLC Framing..........................................................................		357
12.7	AT+FTM	Transmit Data.............................................................................................................		358
12.8	AT+FTS	Stop Transmission and Wait.......................................................................................		359
13. Short Message Service (SMS) Commands........................................................................................				360
13.1	SMS parameters .........................................................................................................................			360
13.2	AT+CMGC		Send an SMS command.........................................................................................	365
13.3	AT+CMGD		Delete short message.............................................................................................	366
13.4	AT+CMGF		Select SMS message format ..................................................................................	367
13.5	AT+CMGL		List SMS messages from preferred store................................................................	368
13.6	AT+CMGR		Read SMS messages.............................................................................................	370
13.7	AT+CMGS		Send Short Message ..............................................................................................	372
13.8	AT+CMGW		Write Short Messages to Memory .........................................................................	374
13.9	AT+CMSS		Send short messages from storage ........................................................................	376
13.10	AT+CNMA		New Message Acknowledgement to ME/TE, only phase 2+ ..................................	377
13.11	AT+CNMI		New short Message Indication .................................................................................	378
13.12	AT+CPMS		Preferred SMS message storage............................................................................	381
13.13	AT+CSCA		SMS Service Center Address..................................................................................	383
13.14	AT+CSCB		Select Cell Broadcast Message Indication ..............................................................	384
13.15	AT+CSDH		Show SMS text mode parameters...........................................................................	385
13.16	AT+CSMP		Set SMS text Mode Parameters..............................................................................	386
13.17	AT+CSMS		Select Message Service..........................................................................................	388
13.18	AT^SCML		List Concatenated Short Messages from preferred store ........................................	390
13.19	AT^SCMR		Read Concatenated Short Messages .....................................................................	391
13.20	AT^SCMS		Send Concatenated Short Messages......................................................................	392
13.21	AT^SCMW		Write Concatenated Short Messages to Memory...................................................	393
13.22	AT^SLMS		List SMS Memory Storage .......................................................................................	394
13.23	AT^SMGL		List Short Messages from preferred store without setting status to REC READ .....	395
13.24	AT^SMGO		Set or query SMS overflow presentation mode or query SMS overflow .................	396
13.25	AT^SMGR		Read short message without setting status to REC READ.....................................	398
13.26	AT^SSCONF SMS Command Configuration ...........................................................................			399
13.27	AT^SSDA		Set SMS Display Availability ....................................................................................	400
13.28	AT^SSMSS Set Short Message Storage Sequence .................................................................			401
14. SIM related Commands.......................................................................................................................				402
14.1	AT+CRSM		Restricted SIM Access............................................................................................	402
14.2	AT+CSIM		Generic SIM Access .................................................................................................	405
14.3	AT^SATR		Query SIM's Answer to Reset Data..........................................................................	407
14.4	AT^SXSM		Extended SIM Access..............................................................................................	408
14.5	AT^SCKS		Query SIM and Chip Card Holder Status .................................................................	410
14.6	AT^SSET		Indicate SIM data ready............................................................................................	412
14.7	AT^SCID	Display SIM card identification number .....................................................................		413
14.8	AT+CXXCID Display card ID.....................................................................................................			414

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15. Remote SIM Access (RSA) Commands .............................................................................................						415
	15.1	AT^SRSA			Remote SIM Access Activation ................................................................................	418
	15.2	AT^SRSM			Remote SIM Access Message ................................................................................	422
		15.2.1 SAP Request Message Parameters ............................................................................				425
		15.2.2 SAP Response Message Parameters .........................................................................				425
	15.3	Related AT Commands ...............................................................................................................				426
		15.3.1 Establishing an RSA Connection in a PC Environment...............................................				426
		15.3.2		Bluetooth scenario (SAP) ............................................................................................		426
		15.3.3 Serial Interface Scenario (XSAP) ................................................................................				427
16. SIM Application Toolkit (SAT) Commands........................................................................................						428
	16.1	AT^SSTA			SAT Interface Activation ...........................................................................................	428
	16.2	^SSTN		SAT Notification ............................................................................................................		430
	16.3	AT^SSTGI			SAT Get Information ...............................................................................................	431
	16.4	AT^SSTR			SAT Response .........................................................................................................	432
17.	Phonebook Commands.......................................................................................................................					433
	17.1	Sort Order for Phonebooks .........................................................................................................				433
	17.2	AT+CNUM			Read own numbers.................................................................................................	434
	17.3	AT+CPBR			Read from Phonebook.............................................................................................	435
	17.4	AT+CPBS			Select phonebook memory storage .........................................................................	438
	17.5	AT+CPBW			Write into Phonebook .............................................................................................	440
	17.6	AT^SPBW			Write into Phonebook with location report...............................................................	443
	17.7	AT^SDLD			Delete the 'last number redial' memory ....................................................................	446
	17.8	AT^SPBC			Find first matching entry in sorted phonebook .........................................................	447
	17.9	AT^SPBD			Purge phonebook memory storage..........................................................................	448
	17.10	AT^SPBG			Display phonebook entries in alphabetical order .....................................................	449
	17.11	AT^SPBS			Step through the selected phonebook alphabetically...............................................	452
18.	Audio Commands ................................................................................................................................					456
	18.1	Audio programming model ..........................................................................................................				456
	18.2	ATL	Set monitor speaker loudness ...........................................................................................			457
	18.3	ATM	Set monitor speaker mode................................................................................................			457
	18.4	AT+CLVL			Loudspeaker volume level........................................................................................	458
	18.5	AT+CMUT			Mute control ........................................................................................................	.... 459
	18.6	AT+VTD		Tone duration .............................................................................................................		460
	18.7	AT+VTS		DTMF and tone generation.........................................................................................		461
	18.8	AT^SAIC			Audio Interface Configuration ....................................................................................	462
	18.9	AT^SNFA			Set or query of microphone attenuation ..................................................................	464
	18.10	AT^SNFD			Set audio parameters to manufacturer default values .............................................	466
	18.11	AT^SNFI			Set microphone path parameters ..............................................................................	467
	18.12	AT^SNFM			Set microphone audio path and power supply.........................................................	468
	18.13	AT^SNFO			Set audio output (= loudspeaker path) parameter ...................................................	470
	18.14 AT^SNFPT Set progress tones .................................................................................................					472
	18.15	AT^SNFS			Select audio hardware set........................................................................................	473
	18.16	AT^SNFTTY Signal TTY/CTM audio mode capability...............................................................				476
	18.17	AT^SNFV			Set loudspeaker volume...........................................................................................	477
	18.18	AT^SNFW			Write audio setting in non-volatile store ..................................................................	478
	18.19	AT^SRTC			Ring tone configuration ............................................................................................	479

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Contents


19.	Hardware Related Commands............................................................................................................							481
	19.1	AT+CCLK		Real Time Clock.......................................................................................................				481
	19.2	AT+CALA		Set alarm time .........................................................................................................				482
	19.3	AT^SAD		Antenna Diagnosis .....................................................................................................				485
	19.4	AT^SBC		Battery Charge Control...............................................................................................				486
		19.4.1 Responses returned by read command.......................................................................						488
	19.5	AT^SBV		Battery/Supply Voltage ...............................................................................................				489
	19.6	AT^SCTM		Set critical operating temperature presentation mode or query temperature				........... 490
		19.6.1	Deferred shutdown ......................................................................................................					492
	19.7	AT^SSYNC				Configure SYNC Pin..............................................................................................		493
		19.7.1 ME status indicated by status LED patterns ................................................................						494
	19.8	AT^SSPI		Serial Protocol Interface ............................................................................................				496
		19.8.1 Specifying Delay Time for I²C ......................................................................................						498
		19.8.2	Selecting SPI Mode .....................................................................................................					499
		19.8.3 Transmitting Data over AT Interface............................................................................						500
		19.8.3.1 Structure of Messages on the I²C Bus .........................................................................						501
		19.8.3.2 Structure of Messages on the SPI ...............................................................................						502
		19.8.4 Error Handling on the I²C Bus......................................................................................						502
		19.8.5 Example: Using I²C Bus...............................................................................................						504
		19.8.6 Example: Transfer and Response Messages on SPI ..................................................						505
	19.9	AT^SWDAC				Configure and Read PWM Signal for DAC...........................................................		506
20.	GPIO Commands .................................................................................................................................							508
	20.1	AT^SPIO		General Purpose IO Driver Open/Close....................................................................				508
	20.2	AT^SCPIN			Pin Configuration ....................................................................................................			509
	20.3	AT^SCPOL				Polling Configuration..............................................................................................		511
	20.4	AT^SCPORT				Port Configuration ...............................................................................................		513
	20.5	AT^SDPORT				Delete a Port Configuration.................................................................................		514
	20.6	AT^SGIO		Get IO state of a specified pin or port .......................................................................				515
	20.7	AT^SSIO		Set IO state of a specified pin or port ........................................................................				516
	20.8	AT^SCCNT				Configure Pulse Counter .......................................................................................		517
		20.8.1 Using the Pulse Counter in Limit Counter Mode..........................................................						518
	20.9	AT^SSCNT				Start and Stop Pulse Counter ................................................................................		519
		20.9.1 Using the Pulse Counter in Start-Stop Counter Mode .................................................						520
21.	Java related Commands .....................................................................................................................							521
	21.1	AT^SJRA		Run Java Application ................................................................................................				521
	21.2	AT^SJNET			Set Dialup Network Access Parameters.................................................................			522
	21.3	AT^SJOTAP				Over The Air Application Provisioning .................................................................		525
	21.4	AT^SJSEC			Write Binary Java Security Data.............................................................................			527
22.	Miscellaneous Commands..................................................................................................................							529
	22.1	A/ Repeat previous command line ............................................................................................						529
	22.2	ATS3	Set command line termination character.........................................................................					530
	22.3	ATS4	Set response formatting character ..................................................................................					531
	22.4	ATS5	Write command line editing character .............................................................................					532
	22.5	AT^SFDL		Enter Firmware Download Mode ..............................................................................				533
23.	Appendix ..............................................................................................................................................							535
	23.1	Restricted access to SIM data after SIM PIN authentication.......................................................						535
	23.2	Star-Hash (*#) Network Commands............................................................................................						536

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Contents

23.3	Available AT Commands and Dependency on SIM PIN .............................................................	539
23.4	Availability of AT Commands Depending on Operating Mode of ME..........................................	546
23.5	AT Command Settings storable with AT&W................................................................................	554
23.6	Factory Default Settings Restorable with AT&F ..........................................................................	557
23.7	Summary of Unsolicited Result Codes (URC).............................................................................	560
23.8	Alphabetical List of AT Commands .............................................................................................	563

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List of Tables

List of Tables
Table 1.1:	Symbols used to mark the type of parameters ...........................................................................	17
Table 1.2:	Symbols used to indicate the correlations with other commands ...............................................	17
Table 1.3:	Symbols used to mark different types of default values of parameters .....................................	17
Table 1.4:	Types of AT commands and responses ....................................................................................	18
Table 1.5:	Examples for character definitions depending on alphabet ........................................................	21
Table 2.1:	Current configuration on ASC0 / MUX channel 1 / USB (example)............................................	34
Table 2.2:	Current configuration on ASC1 and MUX channels 2 and 3 (example) ....................................	35
Table 2.3:	Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes .................................................	45
Table 2.4:	General "CME ERROR" Codes (GSM 07.07) ..........................................................................	49
Table 2.5:	General "CME ERROR" Codes (SIEMENS) ............................................................................	50
Table 2.6:	GPRS related "CME ERROR" Codes (GSM 07.07) .................................................................	50
Table 2.7:	GPRS related "CME ERROR" Codes (SIEMENS) ...................................................................	50
Table 2.8:	SMS related "CMS ERROR" Codes (GSM 07.05) ...................................................................	51
Table 4.1:	Availability of AT Commands on Virtual Channels ..................................................................	120
Table 4.2:	Summary of AT commands with Different Behavior in Multiplex Mode ...................................	121
Table 10.1:	Applicability of AT^SICS <conParmTag> values ...................................................................	256
Table 10.2:	Applicability of AT^SISS <srvParmTag> values ...................................................................	263
Table 12.1:	Fax Result Codes .....................................................................................................................	352
Table 19.1:	Modes of the LED and indicated ME functions.........................................................................	494
Table 19.2:	Values for calculating the delay ................................................................................................	498
Table 19.3:	Special characters for ASCII coding .........................................................................................	500
Table 19.4:	Structure of Transfer and Response Messages on the I²C bus................................................	501
Table 19.5:	Structure of Transfer and Response Messages for SPI ...........................................................	502
Table 23.1:	Star-Hash (*#) Command Overview ........................................................................................	536
Table 23.2:	Abbreviations of Codes and Parameters used in Table 23.1 ..................................................	537
Table 23.3:	Star-Hash Command Response Parameters ..........................................................................	538
Table 23.4:	Star-Hash Commands for Supplementary Services ................................................................	538
Table 23.5:	Available AT Commands and Dependency on SIM PIN...........................................................	539
Table 23.6:	Availability of AT Commands Depending on Operating Mode of ME .......................................	546
Table 23.7:	Settings Stored to User Profile on ASC0 / MUX Channel 1......................................................	554
Table 23.8:	Settings Stored to User Profile on ASC1 / MUX Channels 2 and 3..........................................	555
Table 23.9:	Factory Default Settings Restorable with AT&F .......................................................................	557
Table 23.10:	Summary of Unsolicited Result Codes (URC) ..........................................................................	560
Table 23.11:	Alphabetical List of AT Commands...........................................................................................	563

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List of Figures

List of Figures
Figure 1.1:	Main character table of GSM 03.38 alphabet .............................................................................	22
Figure 1.2:	Extension character table of GSM 03.38 alphabet .....................................................................	23
Figure 15.1:	Basic Remote SIM Access Usage Scenario via Bluetooth .......................................................	415
Figure 15.2:	Basic Remote SIM Access usage scenario via RS232 ............................................................	415
Figure 15.3: SIM usage states of SAP server...............................................................................................		416
Figure 15.4:	SIM usage states of SAP client ................................................................................................	417
Figure 18.1:	Audio programming model for AC75 Module............................................................................	456
Figure 19.1:	Formula for calculating the delay..............................................................................................	498
Figure 19.2:	Delay time on I²C after Write ....................................................................................................	498
Figure 19.4: SPI modes selectable on SPI ...................................................................................................		499
Figure 19.3:	Delay time on I²C after Read ....................................................................................................	499

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1. Introduction

1.Introduction

1.1Scope of the document

This document presents the AT Command Set for the Siemens Cellular Engine

AC75 Release 01.002.

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

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

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1.2 Related documents

1.2Related documents

[1]AC75 Release Notes, Version 01.002

[2]AC75 Hardware Interface Description, Version 01.002

[3]AC75 Java User's Guide

[4]Remote-SAT User's Guide

[5]GPRS Startup User's Guide

[6]Multiplexer User's Guide

[7]Multiplex Driver Developer's Guide for Windows 2000 and Windows XP

[8]Multiplex Driver Installation Guide for Windows 2000 and Windows XP

[9]Application Note 02: Audio Interface Design

[10]Application Note 16: Updating AC75 Firmware

[11]Application Note 17: Over-The-Air Firmware Update

[12]Application Note 24: Application Developer's Guide

[13]Application Note 22: Using TTY / CTM equipment with AC75

[14]SIM Access Profile Interoperability Specification (Revision 1.0), issued by the Bluetooth Special Interest Group

[15]ISO/IEC10646: "Universal Multiple-Octet Coded Character Set (UCS)"; UCS2, 16 bit coding

[16]ITU-T Recommendation V.24: List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE)

[17]ITU-T Recommendation V.250: Serial asynchronous automatic dialling and control

[18]3GPP TS 100 918/EN 300 918 (GSM 02.04): General on supplementary services

[19]3GPP TS 100 907 (GSM 02.30): Man-Machine Interface (MMI) of the Mobile Station (MS)

[20]3GPP TS 23.038 (GSM 03.38): Alphabets and language specific information

[21]3GPP TS 27.005 (GSM 07.05): Use of Data Terminal Equipment - Data Circuit terminating Equipment (DTE

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

[22]3GPP TS 27.007 (GSM 07.07): AT command set for User Equipment (UE)

[23]3GPP TS 27.060 (GSM 07.60): Mobile Station (MS) supporting Packet Switched Services

[24]3GPP TS 51.011 (GSM 11.11): Specification of the Subscriber Identity Module - Mobile Equipment (SIM - ME) interface

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

-Mobile Equipment (SIM - ME) interface

[26]3GPP TS 22.101 (GSM 22.101): Service principles

[27]Common PCN Handset Specification (CPHS) v4.2

[28]USB.ORG: www.usb.org/developers/docs/USB_LANGIDs.pdf

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1.3 Document conventions

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 23.3, Available AT Commands and Dependency on SIM PIN uses the same symbols.

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

-No

ASC1: Is the AT command supported on the second physical serial interface ASC1? + Yes

-No

USB: Is the AT command supported on the USB interface? + Yes

-No

MUXn: Is the AT command usable on the Multiplexer channels MUX1, MUX2, MUX3?

+Yes

-No

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

4Is the AT command supported in AIRPLANE mode?

+ Yes

-No

±In AIRPLANE mode, not all described functions are available. For example, the test or read command is usable, the write or execute command is not. Furthermore, only some of the listed parameters can be changed in AIRPLANE mode. A typical example is AT^SCFG that controls dif-

ferent features.

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:

ASC0 ASC1

USB

MUX1

MUX2

MUX3 Charge

Last

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1.3 Document conventions

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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1.4 AT Command Syntax

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=7,0	Activate CYCLIC SLEEP mode, don't reset ME
OK	Query ME mode
AT+CFUN?	Query ME mode
+CFUN: 7
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 AT Command Syntax

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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1.5 Supported character sets

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

•Terminal Equipment (TE)

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

•TE Character Set

The character set currently used by Terminal Equipment is selected with AT+CSCS.

•Data Coding Scheme (dcs)

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

The behavior when encountering characters that are not valid characters of the supported alphabets is undefined.

Due to the constraints described below it is recommended to prefer the USC2 alphabet in any external application.

If the GSM alphabet is selected all characters sent over the serial line (between TE and TA) are in the range from 0 to 127 (7 Bit range). CAUTION: ASCII alphabet (TE) is not GSM alphabet (TA/ME) !

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

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

•"@" character with GSM alphabet value 0 will terminate any C string! This is because the 0 is defined as C string end tag. Therefore, the GSM Null character may cause problems on application level when using a 'C'- function as "strlen()". This can be avoided if it is represented by an escape sequence as shown in the table below.

By the way, this may be the reason why even network providers often replace "@"with "@=*" in their SIM application.

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

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

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

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1.5 Supported character sets

Table 1.5: Examples for character definitions depending on alphabet

GSM 03.38	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
@	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 Supported character sets

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.

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

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1.5 Supported character sets

Figure 1.2: Extension character table of GSM 03.38 alphabet

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

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

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

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AC75 AT Command Set

1.5 Supported character sets

In the event that an MS receives a code where a symbol is not represented in Figure 1.2, Extension character table of GSM 03.38 alphabet the MS shall display the character shown in the main default 7 bit alphabet table (see Figure 1.1, Main character table of GSM 03.38 alphabet).

1.5.2UCS2 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 Supported character sets

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

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

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 (HWM) of the input/output buffer should be set to approximately 60% of the total buffer size, the Low Watermark (LWM) is recommended to be about 30%. The data flow should be stopped when the buffer capacity rises close to the High Watermark and resumed when it drops below the Low Watermark. The time required to cause stop and go results in a hysteresis between the High and Low Watermarks.

1.6.1Software 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 HWM is reached, CTS is set inactive. When the LWM is passed, CTS goes active again. To achieve smooth data flow,ensure that the RTS/CTS lines are present on your application platform.

Configuring hardware flow control

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

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

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

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

Buffer design considerations

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

•Uplink direction (where ME is receiving data from host application):

CTS control is based on the filling level of the ME's receive buffer. When the application detects that CTS is being deactivated it must instantly stop sending data to the ME's receive buffer. But still, after deactivation of CTS, the receive buffer of the ME can accept another 512 bytes.

•Downlink direction (where ME is sending data to host application):

The transmit buffer of the ME can hold at least 1024 bytes. After deactivation of RTS the ME sends max. 2 more bytes and then stops transferring data to the application.

The maximum time RTS can be kept inactive without losing data is determined by the buffer size and the maximum possible over-the-air data rate. In any case, the local data rate between DCE and DTE (AT+IPR) should be set to a value higher than the maximum possible over-the-air data rate.

•Buffer size recommended for the host application:

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

In fact, the optimal size of the host application buffers is a matter of finding the balance between the amount

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1.6 Serial Interface Flow Control

of data, data throughput, reaction time of the application when handling the buffer, processor performance and available memory. To give an example, a small buffer size (such as 256 bytes) increases the frequency of deactivating RTS/CTS and the frequency of flushing the buffer, thus diminishing the efficiency of the application.

Also, please consider that RTS/CTS flow control cannot stop the data stream coming from the network, e.g. in a GPRS or fax connection. So the lack of appropriate hardware flow control increases the risk of losing data packets if, like in the case of UDP, the connection protocol has no or only minimum error handling functions. Other network protocols are using high level flow control mechanisms. For example, to prevent loss of data the TCP protocol uses retransmission algorithms, fax applications usually repeat the transfer of faulty pages.

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1.7 Communication between Customer Application and AC75

1.7Communication between Customer Application and AC75

Leaving hardware flow control unconsidered the Customer Application (TE) is coupled with the AC75 (ME) via a receive and a transmit line.

Since both lines are driven by independent devices collisions may (and will) happen. For example, if the TE issues an AT command the AC75 starts sending a URC. This will probably cause the TE to misinterpret of the URC being part of the AT command's response.

To avoid this conflict the following measures must be taken:

•If an AT command is finished (with "OK" or "ERROR") the TE shall always wait at least 100 milliseconds before sending the next one.

This gives the AC75 the opportunity to transmit pending URCs and get necessary service.

Note that some AT commands may require more delay after "OK" or "ERROR" response, refer to the following command specifications for details.

•The TE shall communicate with the AC75 using activated echo (ATE1), i.e. the AC75 echoes characters received from the TE.

Hence, when the TE receives the echo of the first character "A" of the AT command just sent by itself it has control both over the receive and the transmit paths.

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1.8 Unsolicited Result Code Presentation

1.8Unsolicited Result Code Presentation

URC stands for Unsolicited Result Code and is a report message issued by the ME without being requested by the TE, i.e. a URC is issued automatically when a certain event occurs. Hence, a URC is not issued as part of the response related to an executed AT command.

Typical events leading to URCs are incoming calls ("RING"), waiting calls, received short messages, changes in temperature, network registration etc.

A list of all URCs can be found in Section 23.7, Summary of Unsolicited Result Codes (URC).

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

•The ME activates its RING line (logic "1") for 1 second, i.e. the RING line changes to the physical "Low" level. This allows the TE to stay in power saving mode until an ME related event requests service.

If several URCs occur coincidently or in quick succession each URC triggers the RING line independently, although the line will not be deactivated between each URC. As a result, the RING line may stay low for more than 1 second.

If an incoming call is answered within less than 1 second (with ATA or if autoanswering is set to ATS0=1) than the RING line will be deactivated earlier.

The "^SHUTDOWN" URC will not activate the RING line.

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

-During the processing of an AT command (i.e. the time after the TE echoes back the first character "A" of an AT command just sent by itself until the ME responds with "OK" or "ERROR").

-During a data call.

Please note that AT command settings may be necessary to enable in-band signaling, e.g. refer to AT+CMER or AT+CNMI.

It is strongly recommended to use the multiplex mode to map logical communication channels onto the serial line of the AC75, for details refer to [6] and AT command AT+CMUX. Doing so it is possible to use one channel to still process URCs while having a data call active on another.

For most of these messages, the ME needs to be configured whether or not to send a URC. Depending on the AT command, the URC presentation mode can be saved to the user defined profile (see AT&W), or needs to be activated every time you reboot the ME. Several URCs are not user definable, such as "^SYSSTART", "^SYSSTART <text>", "^SHUTDOWN"

If autobauding is enabled (AT+IPR=0), URCs generated after restart will be output with 115200 bps until the ME has detected the current bit rate. The URCs "^SYSSTART", "^SYSSTART <text>", however, are not presented at all. For details please refer to Section 4.9.1, Autobauding. To avoid problems we recommend to configure a fixed bit rate rather than using autobauding.

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1.9 Common PCN Handset Specification (CPHS)

1.9Common 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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