Intel 537EX Disconnecting, Modem sends at least 4 seconds of silence before hanging up, Carrier

Page 44

Data Mode AT COMMANDS

Table 18. Data Mode Command Descriptions (Continued)

Command

Default

 

Description

 

 

 

 

 

Long Space Disconnect: This command determines whether the modem disconnects after receiving

 

 

1.6 seconds of silence and whether the modem sends a period of silence to the remote modem before

 

 

disconnecting.

Yn

0

n = 0*

Disables long space disconnect

 

 

n = 1

Enables long space disconnect. The modem disconnects after receiving 1.6 seconds of

 

 

 

silence from the remote modem. Additionally, after receiving an ATH0 command, the

 

 

 

modem sends at least 4 seconds of silence before hanging up.

 

 

 

 

 

Reset Modem/Recall Stored Profile: This command causes the modem to go on-hook (hang-up),

 

 

perform a warm reset, and load user-configuration profile ‘n’ (previously stored in the NVRAM) into the

Zn

0

active profile. The Zn command must be the last command in command string, as it causes all

subsequent commands to be ignored.

 

 

n = 0*

Resets the modem and recalls user profile 0

 

 

n = 1

Resets the modem and recalls user profile 1

 

 

 

 

 

DCD (Data Carrier Detect) Option: This command controls how the modem functions in relation to the

 

 

DCD or RLSD signal.

&Cn

1

n = 0

State of carrier from remote modem is ignored. DCD is always on.

 

 

n = 1*

State of carrier from remote modem is tracked. DCD reflects the state of the received

 

 

 

carrier.

 

 

 

 

 

DTR (Data Terminal Ready) Option: This command controls how the modem responds to DTR. After

 

 

toggling DTR, the host should wait 200 ms before modifying the UART registers or sending a new

 

 

command to the modem. This is done because the modem does not send an ‘OK’ message to indicate it

 

 

has performed the requested function.

 

 

n = 0

In asynchronous mode (&Q0), the modem ignores DTR.

&Dn

2

n = 1

The modem switches from data mode to command mode when an on-to-off transition of

 

DTR occurs.

 

 

 

 

 

n = 2*

An on-to-off transition of DTR causes the modem to go on-hook (hang up). While DTR is

 

 

 

off, auto-answer is disabled.

 

 

n = 3

An on-to-off transition of DTR re-initializes the modem. The re-initialize procedure performs

 

 

 

the same function as a power-up reset, except that the UART registers are not

 

 

 

reconfigured.

 

 

 

&F

none

Load Factory Defaults: This command loads command defaults and S-register factory defaults into the

active configuration and configures the modem for data mode.

 

 

 

 

 

 

 

Guard Tone Option: This command controls whether the modem sends out guard tones while

 

 

connected to a remote modem (for ITU-T V.22 bis [1200 bps] and V.22 bis [2400 bps] connections only).

 

 

Guard tones may be required in some countries but are not needed in the United States. Guard tones are

&Gn

0

sent by the answer modem to disable Central Office echo cancelers.

n = 0*

Guard tone disabled

 

 

 

 

n = 1

550 Hz guard tone enabled

 

 

n = 2

1800 Hz guard tone enabled

 

 

 

 

 

Select Serial Port Flow Control: This command specifies the DTE-to-modem flow control. Software

 

 

flow control uses the characters XOFF (13h) and XON (11h) to stop and start data transmission,

 

 

respectively, both to and from the DTE. Bidirectional hardware flow control uses RTS/CTS to stop and

&Kn

3

start data from the modem.

n = 0

Disables flow control

 

 

 

 

n = 3*

Bidirectional hardware flow control—RTS/CTS

 

 

n = 4

XON/XOFF software flow control

 

 

 

 

NOTE: An asterisk (*) denotes the factory-default setting.

44

536EX Chipset Developer’s Manual

Intel Confidential

Page 43 Page 45
Image 44
Page 43 Page 45
Contents 537EX Chipset Developer’s ManualIntel Confidential Contents Figures Tables 001 Initial release Revision HistoryDate Revision Description Introduction Controllerless Modem Driver OverviewWindows 95 and Windows V.90/V.92 and V.34 Data Modes TapiUnimodem Intelsdb.VXDModem Connection Overview AT Commands Overview DTE-to-DCE Data Rates for Each ModeDCE-to-DCE Data Rates for Each Mode DCE-to-ISP Data Rates for V.90 ModeSending Commands Delayed CallDTE-Modem Data Rate Response Codes Numeric TextCommand Function AT Escape SequencesDial Modifier Dialing digitsData Mode Command Summary Command Function Default Range Reported By &VnIntel Confidential Intel Confidential Intel Confidential +EB +ESA+ESR +ETBM44/V.42/V.42 bis MNP Command Summary Processes flow control characters and passes to local Fax Identity Command Summary Fax Class 1 Command SummaryResponse Hex Code Function IS-101 Voice Command SummaryVoice DTE→DCE Character Pairs Voice DTE →DCE Character Pairs Voice DTE←DCE Character PairsDEL ESCRegister Function Default Range Units Reported by &Vn Dial ModifiersRegister Summary AsciiRegister Function Default Range Units Modem Setup Host Modem Response Command Using AT Commands to Access the S-Registers Sn?, Sn=x, ?Modem Responses and Command Echo En, Vn, Xn, Wn, Qn DTE Disable EnableData Reporting Wn Mapping Resets and then configures the modem to Nvram user profile Product Identification Information AT Commands Product InformationEstablishing a Modem Connection A, D, DS = n, S0 Modem-to-Modem Connection Data Rates Online Command Mode Escape Codes, OnHanging Up Hn, S10, Zn, &D2 Intel Confidential Modem-on-Hold Incoming Voice Call in Data Mode Modem-on-Hold Initiating a Voice Call in Data Mode Intel Confidential Supported Modulation Types Carrier DescriptionDiagnostic Testing S18, &Tn Local Analog Loopback AT&T1Local Analog Loopback With Self-Test AT&T8 Local Modem or Test ModemLicensing Requirements for Hayes Escape Sequence AT Escape SequencesTime-Independent Escape Sequence Example Hayes* Escape Sequence Data Mode Command DescriptionsCommand Default Description Previously stored in the Nvram with the AT&Zn=x command Host in either online or off-line command mode Echo disabled Echo enabledSn=x ATI2DTE Command Modem dials a telephone number touch tone dialingNumeric or verbose form Numeric formDisconnecting Subsequent commands to be ignoredResets the modem and recalls user profile DCD or Rlsd signalAT&V0 Active ProfileStored Profile Telephone NumbersS-register configurations into the Nvram user profile ‘n’ Command to see the stored telephone numberSelect profile = 0-9 a B C D # * T P R W @Command Default Indication Definition+EB CRC generation and checking disabled Nrzi encoding and decoding disabledSecondary channel operation, and vice versa 12/V.34+ESR +ETBM+GMR +GSN+IFC +ILRR=m+MS command description +MA? will display a list of enabled alternative modulations= carrier,carrier,…carrier If +MS = ,0,, no alternative modulations will be availableCarrier Description BELL103BELL212 +MS=m See ‘m’+PHSW= +PMHFValue Description +PMHRConjunction with the +PSS command Enable Short Phase 1 and Short PhaseEnable Short Phase Disable short Phase 1 and Short PhaseMode Features Operating Modes44/V.42/V.42 bis and MNP Data Modem Command Descriptions +ES Settings Answer ModemResulting +ES Connection Types +ES=1, 0 +ES=4, 4 +ES=3, 0 +ES=3, 2\Bn \Kn +DR=m Direction+DS=m Max string3768 +EFCS=mDisplay messages when +ER = Decimal value and the format is as follows+ER=m +ER LapmSetting is ignored if origrqst=6 Control during non-error control operationNon-error control operation +ES=mFax Identity Commands Fax Class 1 CommandsFax Identity Command Descriptions +FMFR?/+FMIMod Selection Table Value Modulation Speed bps30 Hdlc Frame Format Class 1 DTE-Generated Hdlc Frame Information AT+FTH=mod+FCLASS Fax Mode Command Descriptions+FCLASS? +FRH=m +FRS=m+FTH=m IS-101 Voice Mode AT Commands Relay Control Voice Mode Command DescriptionsDtmf Detection Reporting +FLO=m Enable report Function +VDR=m See ‘m’Defaults = ‘C’, BB860980, BFE63883, BB863EE0 Caller ID report Command Reserved Distinctive ringing AllEvent Description +VEM=m See ‘m’HEX Digit Location EIGHT-DIGIT HEX Code B B 8 6 3 E EEX Value BIT Value Event +VIP Local telephone, or speaker128 Nominal transmit level +VLS=m Preassigned Voice I/O LabelsLabel Primitive Code Description Voice I/O Primitive CodesRelay/Playback Control +VRX +VSD=m See ‘m’+VSM=? command to obtain supported sampling rates 141 AD3 3-bit Adaptive differential pulse code modulation+VSM=m Range 4800, 7200, 8000, and 11025 samples/secondCml SerialHard Disk CompressionFactory default is ‘0’ 100 Default value 1 second100 Range 5-255 units of 0.01 secondsDual tones may be sent using the following format +VTS=m NoneSpecified by +VTD=m This sends a 500 ms period of silenceCommand Default Description Register Command Descriptions S10 S16 Range Seconds Default 0 secondsEscape sequences S21 S22 118S25 S30Modem exits sleep mode whenever the host reads or writes to Modem or when a ring signal is detectedSleep mode is disabled by setting S33 to ‘0’ Inactive state whenCaller ID Tags for Formatted Reporting Tag DescriptionRing Uart Emulation in the Controllerless Modem Uart Emulation in Intelsdb.VxDRBR UartTHR Parallel Host Interface Uart Register Bit Assignments Modem Status Register MSR Uart Register DefinitionsScratch Register SCR Bit Framing error OE Overrun Error-Not supportedLine Status Register LSR StackIER Interrupt Enable register Procedure is as followsModem Control Register MCR Line Control Register LCRFifo Control Register FCR BitID1 ID0 Interrupt Identity Register IIRInterrupt Control Functions Interrupt Enable Register IER ID bit 2 for Fifo modeTransmitter Holding Register THR Dlab =Receiver Buffer Register RBR Divisor Latch Registers DLM and DLLProgrammable Data Rates Data Rate Divisor Number Divisor Latch HexFifo Interrupt Mode Operation Fifo Polled Mode Operation16C550A Uart Fifo Operation 102536EX Chipset Developer’s Manual 103
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