12.12 AT+IFC DTE-DCE Local Flow Control | Sony Ericsson GM47, GM48

12. INTERFACE

	<parity>	Description

	3	Space. Default value

Example
	AT+ICF?
	+ICF: 3,3
	OK

12.12 AT+IFC	DTE-DCE Local Flow Control

	Description	Command	Possible Responses

	Defines DTE-DCE local	AT+IFC=[<by_te>,	•	OK
	flow control	[<by_ta>]]	•	ERROR

	Show the current	AT+IFC?	+IFC: <by_te>,<by_ta>
	setting

	Show if the command	AT+IFC=?	+IFC: (list of supported
	is supported		<by_te>s,<by_ta>s)

Defines the flow control between the modem and the computer when in on-line data mode.

No flow control is enabled in any of the command modes.

<by_te>	Description

0	No flow control on DTE

1	Xon/Xoff flow control on DCE. Control characters are
	removed by the DCE interface

2	RTS flow control on DCE. Default value

3	Xon/Xoff flow control on DCE. Control characters are
	passed to the remote DCE/DTE


<by_ta>	Description

0	No flow control on DCE

1	Xon/Xoff flow control on DTE

2	CTS flow control on DCE. Default value

203

LZT 123 7263 R1C

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Image 203

Sony Ericsson GM47, GM48 manual 12.12 AT+IFC DTE-DCE Local Flow Control, +ICF 3,3, At+Ifc?, At+Ifc=?

Contents

GM47/GM48 Publication number LZT 123 7263 R1C All rights reserved Contents 14.1 Digital to Analogue Converter DAC 14.2 Where to Install the ModuleDigital Ground Dgnd VIO 2.75V Supply Conventions AT Command Syntax AT Response Syntax Ericsson Master Reset 109 Command Line Editing Character Backspace 104Blind Dial Delay Control 104 Connection Completion Timeout 105 Select Service for MO SMS Messages 170 Select Bearer Service Type 153Quality of Service Profile Minimum Acceptable 164 Quality of Service Profile Requested 166 Restore SMS Settings 202 12.11 Command Echo 198 12.7Reset to Default Configuration 200 12.9 Switch to 07.10 Multiplex Protocol 200 12.10 Send Command 262 15.10 Ericsson Settings Number 242 14.11Select Service for MO SMS Messages 251 15.3 Service Centre Address 253 15.5 Supplementary Service Notification 328 18.17 Advice of Charge 309 18.5M2M Supplementary Service Dispatch 313 18.10 M2M Supplementary Service Indications 314 18.11 Part 1 Overview Page Manual Structure IntroductionTarget Users Prerequisites Part 4 Using AT Commands GM47 in a Communication System GM47/GM48 ModulesAbout the GM47/GM48 Family Interface between the Module and the Application Gmsk Features Short Message Service Average Power Consumption Service and Support Precautions Abbreviation Abbreviations THD Part 2 Developer’s Kit Page Overview Contents of the Kit Module connections to the developer’s board General Functioning of the Kit Power supply connection and the on-board voltages Audio signals, connection and routing Front view Using the Developer’s Kit Start up Check List Developer’s board overlay Developer’s Board Overlay SW4 Service Jumpers, Switches and Connectors Dcio ON/OFF EAR Micn Bearn Bearp Micp PCMPcmuld Pcmdld Pcmclk Pcmsync Dgnd Pcmin Pcmout System Simvcc Simrst Simclk Simdat Simpresence Simgnd Test System connector pin assignments System Connector Pin Assignments Part 3 Integrating the Module Page Interface Description Mechanical Description Dimensions of the GM47 Physical Dimensions GM47, viewed from underneath System Connector Interface VCC Buzzer ADC3SDA SCL Agnd General Electrical and Logical CharacteristicsAfms Atms Grounds VCC Regulated Power Supply Input Parameter Mode ON/OFF and External Power Signal Times are defined as follows ON/OFF timing and VIO performance Analogue Audio Rxpga Output at Afms for 3dBm0 at PcminOutput at BEARN/BEARP for 3dBm0 at Pcmin AUX AMP Microphone connections to the module Table below shows the audio signal levels for Afms Speaker Signals Pcmdld to Pcmin Pcmuld to Pcmout Electrical characteristicsPCM Digital Audio 16-bit data word format 16-bit word within 24-bit frame Pcmclk Pcmsyn Pcmout Serial Data Interfaces OFF RD, TD RTS, CTS, DTR, DCD, RI Table below shows the switching times UART2 TD2, RD2 Simdata SIM Card Related SignalsRD is used to send data to your application via UART3 Simvcc SIM Detection Simpresence LED states shown below, are hard coded Service/ProgrammingBuzzer 12 LED Following circuit should be used to connect an LED General Purpose Digital I/O Ports ADC2 General Purpose Analogue I/O PortsDAC ADC1 DAC loads Txon Burst Transmission External I 2C Serial Control Bus Vrtc Real Time Clock 10 RTC connections Antenna Connector Hints for Integrating the Module Safety Advice and Precautions Installation of the Module How to Install the Module Antenna Antenna Type Possible Communication Disturbances Mechanical Specifications Technical Data Environmental specifications Declaration of Conformity FCC Certificate Part 4 Using AT Commands Page Syntax Description Introduction to AT Commands Example! ATL=0CR sets the volume of the speaker Crokcr final result code Example! AT+CFUN=0CR powers down the moduleExample! AT+CSCS?CR show current character set CROKCRfinal result code response Remote station busy Command executed, no errorsInvalid command or command line too long No dialling possible, wrong mode Error Codes 2 +CMS Error Message Service Failure Result Code SMS Text Mode Examples on How to Use the AT Commands +CMTI SM,2 Reading messages is performed as in PDU mode AT+CMGL=ALL Gprs Communication GM47/GM48 INTEGRATOR’S Manual See 3.26, AT+CPIN PIN Control Call ControlPIN Control Answer Incoming Call Busy ATD DialNo Dial Tone Dialstring Description ATD07747008670 AT+VTS=4 Included for compatibity. No functionality Signals the MS to terminate an active callATH Hang up ATL Monitor Speaker Loudness ATT Select Tone Dialling ATO Return to Online Data ModeATP Select Pulse Dialling During a call set-up ATX Call Progress Monitoring Control10 AT+CHUP Hang up Call AT+CMOD=? 11 AT+CMOD Call ModeAT+CMOD? 13 AT+VTS Dtmf and Tone Generation 12 AT+CVHU Voice Hang-Up Ascii Dtmf 100 ATS0 Automatic Answer Control Control and StatusATQ Result Code Suppression ATS3? ATS3 Command Line Termination CharacterATS2 Escape Sequence Character ATS2? ATS4? ATS4 Response Formatting Character Included for compatibility. No functionality ATS5 Command Line Editing Character BackspaceATS6 Blind Dial Delay Control Immediately preceding character Connection is aborted ATS7 Connection Completion TimeoutATS8 Comma Dial Modifier Delay Control Connection being established. If this time is exceeded then AT*ECAM=? 10 ATS10 Automatic Disconnect Delay Control11 AT*ECAM Ericsson Call Monitoring AT*ECAM? Control and Status AT*EDST? This command sets the daylight saving time hours12 AT*EDST Ericsson Daylight Saving Time Ecam AT+CLCK 13 AT*EMAR Ericsson Master ResetAT*EMAR=? Inserted and accepted 15 AT*ESMM Ericsson Settings Minute Minder14 AT*EPEE AT+CALA=? 16 AT+CALA Set AlarmAT+CALA? AT+CALD=? 17 AT+CALD Alarm DeleteThis command removes an active alarm Unsolicited result codes +CALV n AT+CCLK=? 18 AT+CCLK Set Clock and Date+CCLK 00/01/01,225448+00 AT+CCLK=19/11/02,093000+00 AT+CCLK? Information given by the GSM network in text format 19 AT+CEER Extended Error Report20 AT+CFUN Set Phone Functionality AT+CIND=? 21 AT+CIND Indicator ControlAT+CIND? 23 AT+CMEE Mobile Equipment Error 22 AT+CLAC List all available AT Commands AT+CMER=? 24 AT+CMER Mobile Equipment Event ReportingAT+CMER? AT+CPAS=? 25 AT+CPAS Phone Activity StatusUnsolicited Result Codes +CKEV key,press +CIEV ind,value +CPAS 0,3,4,129,130,131 26 AT+CPIN PIN Control SIM PUK2 AT+CPIN=0000PH-SIM PIN SIM PIN2 AT+CPWD=? 27 AT+CPWD Change Password AT+CPWD=SC,0000,0001 Intermediate Result Codes +CR serv 28 AT+CR Service Reporting ControlDuring the handshake phase 29 AT+CRC Cellular Result Code AT+CSAS=? 30 AT+CSAS Save SettingsUnsolicited Result Codes +CRING type AT+CSQ=? 31 AT+CSQ Signal StrengthAT+CSQ +CSQ 13,99 AT+CSQ AT+CTZU=? 32 AT+CTZU Automatic Time Zone UpdateSetting fails in an ME error, +CME Error err is returned AT+CTZU? 128 AT*E2EAMS=? AudioAT*E2EAMS Ericsson M2M Audio Profile Modification AT*E2EAMS? Audio diagram of the Codec Configure current profile pr1 to pr21 Mute Volume Description MaxVolume AT*E2EAMS? AT*E2EAMS=? *E2EAMS=0-21,255 Current default profile is AT*E2APR=? AT*E2APR= ErrorAT*E2APR M2M Audio Profile Manipulation AT*E2APR? AT*E2APR? *E2APR E2APR= 0-4,0-2,0-2 Current default profile is profile AT*EALR=? Ericsson Audio Line RequestATMS,AFMS AT*EALR? Ealr AT*EAMS=? Ericsson Audio Mode SelectionAT*EAMS? AT*EARS=? Ericsson Audio Ring SignalAT*EARS? Ericsson Local Audio Mode AT*E2PHFB Portable Handsfree Button Sense Enable Ericsson Music Mute Indication Request Ericsson Microphone Mode AT*EPRR=? 10 AT*EPRR Ericsson Personal Ring Type ReadEprr Reserved. Not supported 11 AT*EPRW Ericsson Personal Ringtype Write Beep. Not supported AT*ERIL=? 12 AT*ERIL Ericsson Ring Level SetAT*ERIL? Eril AT*ERIN=? 13 AT*ERIN Ericsson Ring SetAT*ERIN= AT*ERIN? AT*ERIP=? 14 AT*ERIP Ericsson Ring Signal Playback CommandRefer to the AT*ERIN command for the sound type parameter AT*ERIP = 15 AT*ESMA Ericsson Set Message Alert Sound 16 AT*ESOM Ericsson Settings Own Melody Melody 1 4. Default setting AT*EXVC=? 17 AT*EXVCAT*EXVC? ATM=? 18 ATM Monitor Speaker ControlModem and is only included for compatibility ATM? 152 AT+CBST=? Select Bearer Service TypeData CSD/HSCSD AT+CBST? Name Description AT+CRLP=? Radio Link ProtocolAT+CRLP? +CRLP AT+CRLP? +CRLP 61,61,48,6,0 +CRLP 120,120,48,6,2,3 +CGACT=? Data GprsAT+CGACT PDP Context Activate or Deactivate +CGACT? +CGATT=? AT+CGATT Gprs Attach or Detach+CGATT? +CGDATA=? AT+CGDATA Enter Data State +CGDCONT=? AT+CGDCONT Define PDP Context+CGDCONT? CRLF+CGDCONT APN +CGEREP=? AT+CGEREP Gprs Event Reporting+CGEREP? +CGPADDR=? AT+CGPADDR Show PDP Address+CGPADDR CRLF+CGPAD +CGQMIN=? AT+CGQMIN Quality of Service Profile Minimum Acceptable+CGQMIN? 165 +CGQREQ=? AT+CGQREQ Quality of Service Profile Requested+CGQREQ? 167 GM47/GM48 INTEGRATOR’S Manual AT+CGREG=? AT+CGREG Gprs Network Registration StatusAT+CGREG? +CGSMS=? 10 AT+CGSMS Select Service for MO SMS Messages+CGSMS? AT+CHSC=? Data HscsdHscsd Current Call Parameters AT+CHSC AT+CHSD=? Hscsd Device ParametersAT+CHSD AT+CHSN=? Hscsd Non Transparent Call ConfigurationAT+CHSN? AT+CHSR=? Hscsd Parameters ReportAT+CHSR? AT+CHSU=? Hscsd Automatic User Initiated UpgradingItermediate Result Codes +CHSR rx,tx,aiur,coding AT+CHSU? 176 AT*EENMEA? AT*EENMEA Nmea GPS Mode on UART2GPS Interoperability Uart AT*E2NMPR=? AT*E2NMPR Ericsson M2M Set Nmea GPS Port RateAT*E2NMPR=? *E2NMPR=0-10 Port rate currently set AT*E2NMPR? Set GPS/NMEA port rate to 4800 baud 180 AT*E2FAX? FaxAT*E2FAX Ericsson M2M Fax Comm. Baud Rate Modification E2FAX= Sets default RS232 setting to 9600 baud Low Level Fax CommandsE2FAX Current default setting is 19200 baud 10.1 AT 10.2 AT&F Set to Factory Defined ConfigurationSupports AT commands, it returns an OK final result code Identification 10.6 AT+CGMM Read MS Model Identification 10.4 AT List all Supported AT CommandsLists all the commands supported by the MS 10.5 AT+CGMI Read MS Manufacturer Identification AT+CGMR 10.7 AT+CGMR Read MS Revision IdentificationBVGM47 About the software version 10.9 AT+GMI 10.8 AT+CGSN Read MS Product Serial Number Identification R2A009prgCXC1122112 10.10 AT+GMM Read Model Identification10.11 AT+GMR Read Revision Identification +CGACT 1,0 Configuration Settings on Channel 0 &C10.12 ATI Identification Information CXC1122112 189 190 AT*E2IO=? Input/Output11.1 AT*E2IO Ericsson M2M Input/Output Read/Write 192 Read False Unsolicited Result Codes *E2IO source, io, valReading an I/O Writing in an Output Checking an I/O status Configuring an I/O Checking an Input Trigger Triggering an Input Determines the behaviour of the carrier detect Interface12.3 AT&D Circuit 108 DTR Response 12.4 AT&S Circuit 107 DSR Response Phone 12.5 AT+WS46 Mode Selection12.6 ATE Command Echo Determines the behaviour of the data set ready signal List of result codes 12.7 ATV DCE Response Format 12.9 AT+CMUX Switch to 07.10 Multiplex Protocol 12.8 ATZ Reset to Default Configuration 201 Result code, if this is not automatically determined Not 12.10 AT+CRES Restore SMS SettingsParameters, cannot be restored 12.11 AT+ICF Cable Interface Character Format AT+IFC=? 12.12 AT+IFC DTE-DCE Local Flow Control+ICF 3,3 AT+IFC? Transmitted 12.14 AT+IPR Cable Interface Port Command12.13 AT+ILRR Cable Interface Local Rate Reporting Specifies whether or not the extended-format +ILRRrate AT*E2SPI=? 12.15 AT*E2SPI Serial Peripheral InterfaceE2SPI AT*E2SPI? AT*E2SPI=0 AT*E2ESC=? 12.16 AT*E2ESC M2M Escape Sequence Guard TimeAT*E2ESC? 208 AT*E2CD=? Network13.1 AT*E2CD Ericsson M2M Cell Description AT*E2CD? According to GSM 04.18 V8.6.0, the coding of the timing 13.2 AT*E2EMM Ericsson M2M Engineering Monitoring Mode AT*E2EMM=1 AT*E2EMM=7 Responses. Default value is 215 216 SIM 13.3 AT*E2SPN M2M Service Provider Indication13.4 AT*EALS Ericsson Request ALS Status AT*ECSP=? 13.5 AT*ECSP Ericsson Customer Service ProfileSIM AT*EPNR=? 13.6 AT*EPNR Ericsson Read SIM Preferred Network AT*EPNW=? 13.7 AT*EPNW Ericsson Write SIM Preferred NetworkEpnr 10,27801 SSN 13.8 AT*E2SSN Ericsson M2M SIM Serial NumberAT*E2SSN? AT*E2SSN=? AT*ESLN=? 13.9 AT*ESLN Ericsson Set Line NameSets the name tag for a selected line AT*ESLN? Esln 234157411545420 13.10 AT+CIMI Subscriber Identification13.11 AT+CLCK Attached to the ME Baoc bar all outgoing calls LF+CNUM 13.12 AT+CNUM Subscriber Number+CPWD AT+CNUM AT+COLP=? 13.13 AT+COLP Connected Line Identification PresentationUDI AT+COLP? Disable AT+COPS=? 13.14 AT+COPS Operator SelectionAT+COPS? AT+CREG=? 13.15 AT+CREG Network RegistrationAT+CREG? AT*ECPI=? 13.16 AT*ECPI Ciphering Indicator+CREG 0,1 AT*ECPI? 231 AT*E2NBTS=? 13.17 AT*E2NBTS Ericsson M2M Neighbour BTSAT*E2NBTS? 233 234 14.2 AT*ESAG Ericsson Add to Group Phonebook14.1 AT*E2PBCS Ericsson M2M Phonebook Check Sum AT*ESCG=? 14.3 AT*ESCG Ericsson Create Group AT*ESCN=? 14.4 AT*ESCN 238 14.6 AT*ESDI Ericsson Delete Group Item 14.5 AT*ESDG Ericsson Delete Group AT*ESGR=? 14.7 AT*ESGR Ericsson Group Read14.8 AT*EGIR Ericsson Group Item Read AT*ESGR AT*ESIL=? 14.9 AT*ESIL Ericsson Silence CommandIs in silent mode, all sounds from the MS are prevented AT*ESIL? AT*ESNU=? 14.10 AT*ESNU Ericsson Settings NumberAT*ESNU? +CPBF=? 14.11 AT+CPBF Phonebook Find14.12 AT+CPBR Phonebook Read +CPBF 244 AT+CPBS=? 14.13 AT+CPBS Phone StorageAT+CPBS? AT+CPBW=? 14.14 AT+CPBW Phonebook Write AT*ECAW=? 14.15 AT*ECAW Ericsson Callers Allowed Write AT*ECAR=? 14.16 AT*ECAR Ericsson Callers Allowed ReadCluid AT*ECAR= If listing fails in a ME +CME Error err is returned 250 15.3 AT+CPMS Preferred Message Storage Short Message Services Point to Point15.2 AT+CGSMS Select Service for MO SMS Messages 15.1 AT+CPIN PIN Control +CPMS ME,0,40,SM,1,15,ME,0,40 +CPMS ME,SM,ME,SM,ME,SM AT+CSCA=? 15.4 AT+CSCA Service Centre AddressAT+CPMS=sm,sm,sm +CPMS 1,15,1,15,1,15 AT+CSCA? AT+CMGF=? 15.5 AT+CMGF Message Format+CSCA 44385016005,145 AT+CMGF? AT+CMGW=? 15.6 AT+CMGW Write Message to Memory ESC Text Mode AT+CMGS=? ESC Error15.7 AT+CMGS Send Message 258 259 AT+CMSS=? 15.8 AT+CMSS Send From StorageAT+CSMP=17,167,0,0 AT+CMGS=+447747008670 Test SMS +CMGS Command is AT+CMGC=? 15.9 AT+CMGC Send Command+CMGC Text is entered ctrl-Z/ESC AT+CNMI=? 15.10 AT+CNMI New Message Indications to TEAT+CNMI? Unsolicited Result codes 266 +CBM AT+CMGR=? 15.11 AT+CMGR Read MessageDisplay cell broadcast messages AT+CNMI=3,0,2,0,0 AT+CMGR= 269 Successful and CBM storage +CMGR 271 272 Compressed text not supported AT+CMGL=? 15.12 AT+CMGL List MessageR1A100 CXC1122112 +CMGL 275 AT+CMGL? AT+CMGL 277 278 279 AT+CSDH? 15.14 AT+CSDH Show Text Mode Parameters15.13 AT+CMGD Delete Message AT+CMGD=? AT+CSMP=? 15.15 AT+CSMP Set Text Mode ParametersAT+CSMP? 15.16 AT+CSCS Select Character Set AT+CSMS=? 15.17 AT+CSMS Select Message Service+CSMS AT+CSMS? AT*E2SMSRI=? 15.18 AT*E2SMSRIRing indicator for SMSSMS Error RI is disabled for incoming SMS messages. Default value 286 See 15.10, AT+CNMI New Message Indications to TE Short Message Services Cell Broadcast16.1 AT+CNMI New Message Indications to TE 16.2 AT+CSCB Select Cell Broadcast Message Type 288 AT*E2STKS=? SIM Application ToolkitSTK AT*E2STKS? AT*E2STKD=? Display Text Error17.3 AT*E2STKD M2M STK Display Text AT*E2STKG=? 17.4 AT*E2STKG M2M STK Get InkeyValues follow GSM 11.14 standard GET Inkey 292 AT*E2STKI=? 17.5 AT*E2STKI M2M STK Get InputInput Answer Description 295 AT*E2STKL=? Select Item Error17.6 AT*E2STKL M2M STK Select Item Maximum length is fixed Maximum length is fixed AT*E2STKM=? 17.7 AT*E2STKM M2M STK Set Up MenuUP Menu Error GSM default alphabet Command 17.9 AT*E2STKC M2M STK Set Up CallParameters have no default values AT*E2SKTN command. The ME answers with OK, or Error No response from user. It corresponds to ‘12’ no response ME passes the alphaid within Send Short Message 17.10 *E2STKE STK Send Short MessageUnsolicited Result Code E2STKE coding, textlength , alphaid 17.11 *E2STKP STK Send SS 17.12 *E2STKU STK Send Ussd Unsolicited Result Code 17.14 AT*E2STKTO SIM Application Toolkit SettingsE2STKR indicator 17.13 *E2STKR STK Refresh Unsolicited result code *E2STKTO command 18.2 AT+CACM Accumulated Call Meter Supplementary Services18.1 AT+CPIN PIN Control AT+CAMM=? 18.3 AT+CAMM Accumulated Call Meter MaximumAT+CAMM? AT+CAOC=? 18.4 AT+CAOC Advice of ChargeAT+CAOC? SEK 18.5 AT+CPUC Price Per Unit and Currency TableAT+CPUC? AT+CPUC=? AT*EDIF? 18.6 AT*EDIF Ericsson Divert FunctionWith the unsolicited result code *EDIF Edif AT*EIPS? 18.7 AT*EIPS Identity Presentation SetUnsolicited Result Codes *ELIPalpha tag *EOLPalpha tag AT*EIPS=ID AT*ELIN=? 18.9 AT*E2SSD M2M Supplementary Service Dispatch18.8 AT*ELIN Ericsson Line Set AT*ELIN? Refer to GSM 02.30 for Public MMI services and codes 18.10 AT*E2SSI M2M Supplementary Service Indications Ssicallbarred SsisimerrorSsinetworkproblem Ssinumbererr Multiparty BearerserviceTeleservice Bsallpadaccesscaservices BS12KBITUNRESTRICTEDDIGITAL BsallsynchronousservicesTsalldataservices Tsallteleservicesexceptsms Ssstatuspra TemporarydefaultrestrictedTemporarydefaultallowed Ssstatusprovisioned AT+CCFC=? 18.11 AT+CCFC Call Forwarding number and Conditions+CCFC Default value if ‘+’ is in sca AT+CCWA=? 18.12 AT+CCWA Call WaitingAT+CCWA? Unsolicited Result Codes +CCWA number, type, class Default value is AT+CHLD=? 18.13 AT+CHLD Call Hold and MultipartyAT+CCWA=? +CCWA Integer type equals to numbers entered before Send AT+CLIP=? 18.14 AT+CLIP Calling Line IdentificationAT+CLIP? AT+CLIR? 18.15 AT+CLIR Calling Line Identification Restriction+CLIP number,type +CLIP 07747008670,129,,,Matt L,0 Presentation indicator is used according to AT+CSSN=? 18.16 AT+CSSN Supplementary Service NotificationAT+CSSN? Enable the +CSSU result code presentation status in the TA AT+CUSD=? 18.17 AT+CUSD Unstructured Supplementary Service DataAT+CUSD? +CUSD0 OK Different alternatives are shown below AT+CUSD=1,*#100# +CUSD 0,07787154042 +CUSD0,ALARM Alphabetical Listing of AT Commands AT*E2STKS AT*E2STKLAT*E2STKM AT*E2STKN AT*ESDI AT*ESCGAT*ESCN AT*ESDG AT+CHLD AT+CGQREQAT+CGREG AT+CGSMS AT+CPBS AT+CPASAT+CPBF AT+CPBR ATA AT+IPRAT+VTS AT+WS46

Sony Ericsson GM47, GM48 12.12 AT+IFC DTE-DCE Local Flow Control, +ICF 3,3, At+Ifc?, At+Ifc=?

Models: GM47 GM48

+ICF: 3,3

12.12 AT+IFC

DTE-DCE Local Flow Control

AT+IFC?

AT+IFC=?