Recovering AT Commands | Paradyne 3830 instruction

2. Model 3830 Modem Installation

To establish a connection with a remote modem, use the D (Dial) command. Refer to Chapter 4, AT Commands and S-Registers, for more information.

Recovering AT Commands

AT commands are issued from asynchronous terminals and personal computers. Certain dialing methods, such as V.25bis and synchronous operation, disable the use of AT commands and place the modem into a state known as Dumb mode. The Model 3830 is capable of normal operation when in Dumb mode. However, if the setting of a configuration option must be changed, it can only be accomplished using an AT command.

The AT Recovery command (AT***) places the modem into a temporary state that restores AT commands. When in this state, the modem's previous settings are retained except for the following configuration options:

•The DTE Dialer Type configuration option (&M and &Q) is set to AT

•The Async/Sync Mode configuration option (&M and &Q) is set to Async

•The DSR Control configuration option (&S) is set to Forced On

•The LSD Control configuration option (&C) is set to Forced On

If these settings are not appropriate, then change them to a setting compatible with your current application.

The procedures for an AT recovery using an asynchronous terminal or personal computer are listed in the following section. Read through these procedures before performing a recovery:

1.Turn the modem Off and then ON. The modem performs a power-up self-test in which all LEDs light. While this is running, repeatedly press the A key of your DTE's keyboard (or keep the key depressed if your keyboard automatically repeats characters that way). Keep doing this until A's (or a's) appear on your DTE screen. (You may use all uppercase or all lowercase characters.)

At least three consecutive A's must be entered within a 2-second time interval.

3830-A2-GB91-30

August 1998

2-9

Image 31

Paradyne 3830 manual Recovering AT Commands

Contents

Comsphere 3800 Series Modems Model Series Modems Model Comsphere Trademarks Warranty, Sales, and Service Information Important Safety Instructions Safety Instructions F FC FC F CCC C FC CC FC C C United States Government Requirements and Equipment Return Comsphere 3800 Series Modems ± Model Canada Switched Telephone Network Comsphere 3800 Series Modems ± Model Table of Contents Appendices AT Command Set and S-Registers Figures List of Figures Tables List of Tables Preface How to Use this ManualObjectives and Reader Assumptions Related Documents Overview Introduction Features Model 3830 Front Panel Status Indicators LEDs Label Color Indicates Model 3830 LEDs Rate Model 3830 LEDs Label Color Indicates Comsphere 3800 Series Modems ± Model August Model 3830 Modem Package Model 3830 Modem Installation Customer- Supplied Equipment Model 3830 Installation Model 3830 Rear Panel Dial-Line Connection DTE Connection AC Power Transformer Connection Wire Leased-Line ConnectionTelephone Connection Modem Power-Up Communications Software Installation Selecting Factory Configuration Options Type AT&Fy&Wn Recovering AT Commands Press Enter 25bis Applications Initialization Strings AT&T Exclusive Dialing for Datakit Applications Synchronous Leased-Line Applications Fax Operation Fax Operation Comsphere 3800 Series Modems ± Model Operating Modes AT Command Set and S-Registers Escape Sequence and Escape Guard Time Switching Between Data Mode and Online Command Mode Command Guidelines Result Codes Result Codes Connection at 7200 bps Connection at 16,800 bps AT Command List  ITU-T/Bell Mode Model 3830 AT Commands  AT Command Recovery Mode Repeat Last Command  Answer Mode ATD9,5551234 Model 3830 AT Commands Dn  Dial DS=n  Dial Stored Number Model 3830 AT CommandsEn  Command Character Echo Hn  Hook Switch Control Mn  Speaker On/Off Model 3830 AT Commands  IdentificationLn  Speaker Volume  Return to Online or Data Mode  Tone Dial Model 3830 AT Commands Qn  Result CodesSn=r  Change S-Register Sn?  Display S-Register Extended Result Code Yn  Long Space Disconnect Zn  Reset and Load Active Model 3830 AT Commands Cn  LSD Control Fn  Select Factory Default Configuration Options Model 3830 AT Commands Dn  DTR Action Option Value G0 DisableGn  V.22bis Guard Tone Jn  Dial Transmit Type Ln  Leased Mode Comsphere 3800 Series Modems ± Model Model 3830 AT Commands Model 3830 AT Commands Sn  DSR Control Model 3830 AT Commands Tn  Tests Wn  Write Save to Memory Model 3830 AT Commands Vn  View Configuration OptionsXn  Transmit Clock Source \An  Maximum Frame Size Model 3830 AT Commands Zn=x  Store Telephone Numbers\A3 \Dn  CTS Control Model 3830 AT Commands \Cn  Error Control Negotiate Buffer\Gn Modem to Modem Flow Control Break Buffer Control \Q2 Model 3830 AT Commands Nn  Error Control Mode An  Error Control Fallback Character Model 3830 AT Commands \Tn  No Data Disconnect Timer\ Xn  XON/XOFF Passthrough Flow Control Model 3830 AT Commands Bn  Modulation and Data Rate Rn  DTE Rate Model 3830 AT Commands Cn  MNP5 Data Compression″ Hn  V.42bis Compression Model 3830 S-Registers S0  Auto-Answer Ring Number Register List S5  Backspace Character Model 3830 S-Registers S2  AT Escape CharacterS3  Carriage Return Character S4  Line Feed Character S10  No Carrier Disconnect S7  No Answer TimeoutModel 3830 S-Registers S6  Blind Dial Pause S8  ``,º Pause Time for the Dial Modifier S26  RTS-to-CTS Delay Model 3830 S-Registers S18  Test TimeoutS34  1800 Hz Training Tone S36  Rate Auto Originate Model 3830 S-Registers S35  Auto Redial Leased Line S38  DTR Cont Repeat Model 3830 S-Registers S37  Auto Redial S41  Dial-Line Rate Model 3830 S-Registers S39  Receive Buffer Disconnect Delay S44  Leased-Line Rate Model 3830 S-Registers S43  V.32bis TrainS45  Leased Line Transmit Level S47  Auto Dial Standby Model 3830 S-Registers S46  Bad Lines Auto Originate Model 3830 S-Registers S48  Leased Line Carrier On Level S49  Transmit Buffer Disconnect DelayS51  DTE Remote Loopback CT140 S53  V.54 Address S55  Access from RemoteS56  Remote Access Password Model 3830 S-Registers S52  DTE Local Loopback CT141 S61  CT111 Rate Control Model 3830 S-Registers S57  Remote Access PasswordS58  Remote Access Password S59  Remote Access Password S63  V.25bis Idle Character Model 3830 S-Registers S62  V.25bis CodingS64  V.25bis New Line Character S66  NMS Call Messages Model 3830 S-Registers S65  Line Current DisconnectS67  Directory Location 1 Callback S76  V.32bis Autorate Dial Line Model 3830 S-Registers S69  Make Busy Via DTRS74  Network Position Identification S75  Network Management Address S78  V.32bis Automode Dial Line Model 3830 S-Registers S77  DTR Alarm Reporting S82  V.32bis Autorate Leased Line S81  Leased Line Signal Quality Retrain S88  Straps When Disconnected Model 3830 S-Registers S84  AT Command ModeS85  Fast Disconnect S90  DTE Rate = VF Rate Model 3830 S-Registers S89  V.42 ARQ Window Size Increase S93  RJ11 Cellular Adapt Model 3830 S-Registers S91  Cellular Enhancements Comsphere 3800 Series Modems ± Model August Troubleshooting a Table A-1 Symptom ActionModem Health Modem ± DTE Connection Table A-2 Table A-3 Modem ± VF Connection Symptom Action Modem Ð DTE Connection Modem ± VF Connection Online Operation Table A-4 Leased-Line Operation Table A-5 Technical Specifications Technical Specifications B Compatibility Table B-1 Model 3830 Technical Specifications Description Power Error Control Table C-1 EIA-232-D Pin Assignments RS-232 Name Signal Circuit Pin Source FunctionPin Assignments C EIA-232-D Pin Assignments Signal Source Circuit Function VF Connector Pin Assignments Comsphere 3800 Series Modems ± Model Leased Center Comsphere 3800 Series Modems ± Model ITU-T V.25bis Dialing Commands Response D Call Request Commands Call Request with Number Provided CRN Call ResponseCall Request with Stored Memory Address Provided CRS Call Failure Indication CFI Call Connecting CNX Connect Incoming Call CIC Call Answer CommandsIncoming Call INC Disregard Incoming Call DIC Request List of Stored Numbers RLN Program Normal PRNList Stored Number Response LSN Valid VAL Command ResponseInvalid INV Call Request Commands List Response Comsphere 3800 Series Modems ± Model Active Operating Glossary Asynchronous CSA DCE DOC FCC ITU-T JM8 PBX Pstn Xoff Comsphere 3800 Series Modems ± Model Glossary-12 Index Symbols Index-2 Index Index-4 DTR Index-6 Index-7 Index-8 Index-9 Index-10 Index-11 Index-12