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Compaq 244100-005 - Deskpro 2000 - 16 MB RAM White Paper

Integrated modem commands
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Download this manual See also: Maintenance and Service Manual, Service Reference Manual
White Paper
December 1998
ECG021/1298
Prepared by
Portable Marketing Services
Compaq Computer Corporation
Contents
Entering a Command ................3
Command.................................3
Command Line .........................3
Repeating a Command .............3
Using Online Mode ...................4
Mode ........................................4
Shortcut....................................4
Icon ..........................................4
AT Command Set .......................6
Summary..................................6
Result Code Summary ..............7
S Registers ...............................29
Values ....................................29
Reading an S Register ............29
S-Register Summary...............30
AT FAX Command Set..............39
Summary................................39
Descriptions............................40
V.25ter AT Commands............45
V.80 AT Command Set .............46
V.80 AT Commands................46
Compaq V.90
Integrated Modem Commands
Abstract: This document includes comprehensive coverage of the
following topics:
AT command set and S registers used to control modem
functionality at an advanced level
AT FAX command set to control fax communications

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  • Page 1: Table Of Contents

    Compaq V.90 December 1998 ECG021/1298 Integrated Modem Commands Prepared by Portable Marketing Services Compaq Computer Corporation Abstract: This document includes comprehensive coverage of the following topics: Contents AT command set and S registers used to control modem Using Modem Commands ..3 Entering a Command ....3...
  • Page 2 This guide contains information protected by copyright. No part of this guide may be photocopied or reproduced in any form without prior written consent from Compaq Computer Corporation. , and LTE are registered in the U.S. Patent and Trademark Office.

  • Page 3: Using Modem Commands

    Compaq V.90 Integrated Modem Commands Using Modem Commands Entering a Command Use the following guidelines when issuing modem commands: When using AT commands, start every command line (except the A/ and +++ commands) with the attention (AT) code characters; otherwise, the modem will not execute the command.

  • Page 4: Using Online Mode

    Compaq V.90 Integrated Modem Commands Using Online Mode In the online mode, the transmitting modem receives characters from the computer, converts the data to analog signals, then transmits these signals over the telephone line. The process of altering a signal for transmission is called modulation. The receiving modem receives analog signals from the telephone when in the online mode and converts or demodulates the signal, returning it to the digital form that can be used by the computer.
  • Page 5 Compaq V.90 Integrated Modem Commands The Phone Number dialog box is displayed. 5. Select Connect UsingêDirect to Com 2. 6. Click OK. The Modem Port Settings dialog box is displayed. 7. Click OK. The command mode screen is displayed with a blinking cursor in the upper-left corner.

  • Page 6: At Command Set

    Compaq V.90 Integrated Modem Commands AT Command Set AT Data Command Set Summary Command Description Command Description Repeat last command &J Auxiliary relay options Answer command &K Local flow control selection Communication standard setting &M Asynchronous communications mode Carrier control &Q...

  • Page 7: Result Code Summary

    Compaq V.90 Integrated Modem Commands Result Code Summary Result Code Numeric Description Command executed CONNECT Modem connected to line RING A ring signal has been detected NO CARRIER Modem lost carrier signal, or does not detect carrier signal, or does not detect answer tone...
  • Page 8 Compaq V.90 Integrated Modem Commands Result Code Summary continued Result Code Numeric Description CONNECT 44000 EC* Connection at 44000 bits / s (K56flex mode) or V.90 CONNECT 46000 EC* Connection at 46000 bits / s (K56flex mode) CONNECT 48000 EC* Connection at 48000 bits / s (K56flex mode) or V.90...

  • Page 9: At Command Descriptions

    Compaq V.90 Integrated Modem Commands AT Command Descriptions Escape sequence The escape sequence allows the modem to exit data mode and enter online command mode. While in online command mode, you may communicate directly to your modem using AT commands. Once you are finished, you may return to data mode using the ATO command.
  • Page 10 Compaq V.90 Integrated Modem Commands Result Codes: n = 1 ERROR Otherwise Dial This command instructs the modem to begin the dialing sequence. The dial string (n, including modifiers and the telephone number) is entered after the ATD command. A dial string can be up to 40 characters long. Any digit or symbol (0-9, *, #, A, B, C, D) may be dialed as touch-tone digits.
  • Page 11 Compaq V.90 Integrated Modem Commands Online Data Character Echo Command This command determines whether the modem will echo data from the DTE. This modem does not support the F0 version of the command. However, the modem will accept F1, which may be issued by older communication software, to assure backward compatibility.
  • Page 12 Compaq V.90 Integrated Modem Commands The ATI11 result has two pages; the user must hit a key to get the second page. Description K56flex Connection V.90 Connection Last Connection V.90 Initial Transmit Carrier Rate 28800 28800 Initial Receive Carrier Rate...
  • Page 13 Compaq V.90 Integrated Modem Commands 8. Mean-square error of received downstream signal. This is the difference between received constellation point and reference decision point. This is a dimensionless decimal number, only valid during a call. Higher numbers are worse. There is no absolute quality threshold; it depends on the downstream data rate.
  • Page 14 Compaq V.90 Integrated Modem Commands Result Codes: n = 0, 1, 2, 3 ERROR Otherwise Monitor Speaker Mode This command turns the speaker on or off. The speaker is off The speaker is on until the modem detects the carrier signal (default)
  • Page 15 Compaq V.90 Integrated Modem Commands Result Code Control Result codes are informational messages sent from the modem and displayed on your monitor. Basic result codes are OK, CONNECT, RING, NO CARRIER, and ERROR. The ATQ command allows the user to turn result codes on or off.
  • Page 16 Compaq V.90 Integrated Modem Commands Result Code Selection and Call Progress Monitoring This command enables tone detection options used in the dialing process. As these functions are chosen, the result codes of the modem chip set are also affected. Therefore, this command is frequently used to control the responses of the modem chip set.
  • Page 17 Compaq V.90 Integrated Modem Commands Result Codes: n = 0 ERROR Otherwise Recall Stored Profile This command instructs the modem chip set to go on-hook and restore the profile saved by the last &W command. Either Z0 or Z1 restores the same single profile.
  • Page 18 Compaq V.90 Integrated Modem Commands &D2: If the DTR signal is not detected while in online data mode, the modem disconnects (default). &D3: Reset on the on-to-off DTR transition. Result Codes: n = 0, 1, 2, 3 ERROR Otherwise &Fn Load Factory Settings This command loads the configuration stored and programmed at the factory.
  • Page 19 Compaq V.90 Integrated Modem Commands Result Codes: n = 0, 3, 4 ERROR Otherwise &Mn Asynchronous Communications Mode &M0: Asynchronous mode (default) &M1: Reserved &M2: Reserved &M3: Reserved &M4: Reserved Result Codes: n = 0 ERROR Otherwise &Pn Pulse Dial Make-to-Break Ration Selection &P0:...
  • Page 20 Compaq V.90 Integrated Modem Commands &Sn Data Set Ready (DSR) Option This command selects DSR action. &S0: DSR always ON (default). &S1: DSR comes on when establishing a connection and goes off when the connection ends. Result Codes: n = 0, 1...
  • Page 21 Compaq V.90 Integrated Modem Commands &V View Active Configuration and Stored Profile This command is used to display the active profiles. &V0: View active file For example: Option Selection AT Command Comm Standard Bell CommandCharEcho Enabled Speaker Volume Medium Speaker Control...
  • Page 22 Compaq V.90 Integrated Modem Commands Press any key to continue; ESC to quit. Option Selection AT Command No Carrier Disc 2000 msec DTMF Dial Speed 95 msec Escape GuardTime 1000 msec Data Calling Tone Disabled Line Rate 33600 DSVD mode...
  • Page 23 Compaq V.90 Integrated Modem Commands Select Maximum MNP Block Size The modem will operate an MNP error corrected link using a maximum block size controlled by the parameter supplied. \A0: 64 characters \A1: 128 characters \A2: 192 characters \A3: 256 characters (default)
  • Page 24 Compaq V.90 Integrated Modem Commands Break Control Controls the response of the modem to a break received from the DTE or the remote modem or the \B command. The response is different in three separate cases. The first case is where the modem receives a break from the DTE when the modem is operating...
  • Page 25 Compaq V.90 Integrated Modem Commands Error Control Mode Selection This command determines the type of error control used by the modem when sending or receiving data. \N0: Buffer mode. No error control (same as &Q6). \N1: Direct mode. \N2: MNP or disconnect mode. The modem attempts to connect using MNP 2-4 error control procedures.
  • Page 26 Compaq V.90 Integrated Modem Commands Result Codes: n = 0-255 ERROR Otherwise Protocol Result Code \V0: Disable protocol result code appended to DCE speed. \V1: Enable protocol result code appended to DCE speed (default). \V2: Same as \V1. Result Codes:...
  • Page 27 Compaq V.90 Integrated Modem Commands The table below shows the possible values of n: “AT-V90=n” Downstream Rate V.90 disabled Auto Rate (default) 28000 kbit/s 29333 kbit/s 30666 kbit/s 32000 kbit/s 33333 kbit/s 34666 kbit/s 36000 kbit/s 37333 kbit/s 38666 kbit/s...
  • Page 28 Compaq V.90 Integrated Modem Commands %En Enable/Disable Auto-Retrain and Fallback/Fall Forward Provides option for the modem to automatically monitor line quality to fall back when line quality is insufficient and to fall forward when line quality is sufficient. %E0: Disable fallback/fall forward...

  • Page 29: S Registers

    Compaq V.90 Integrated Modem Commands S Registers Setting S Register Default Values The S register default values function reliably under most circumstances. However, these values may be modified if necessary. For example, it may take an especially long time to get a dial tone in your office, so you may choose to reset S7 for a longer wait time.

  • Page 30: S-Register Summary

    Compaq V.90 Integrated Modem Commands S-Register Summary Register Default Description Automatic answer ring number Ring counter AT escape character Command line termination character Response formatting character Command line editing character Wait before dialing Connection completion time-out Comma dial modifier time...

  • Page 31: S-Register Descriptions

    Compaq V.90 Integrated Modem Commands S-Register Descriptions Auto Answer Ring Number This register determines the number of rings the modem will count before automatically answering a call. Enter 0 (zero) if you do not want the modem to automatically answer at all.
  • Page 32 Compaq V.90 Integrated Modem Commands Command Line Editing Character (user defined) This register sets the character recognized as a backspace and pertains to asynchronous only. The modem will not recognize the backspace character if it is set to a value that is greater than 32 ASCII.
  • Page 33 Compaq V.90 Integrated Modem Commands Automatic Disconnect Delay This register sets the length of time, in tenths of a second, that the modem waits before hanging up after a loss of carrier. This allows for a temporary carrier loss without causing the local modem to disconnect.
  • Page 34 Compaq V.90 Integrated Modem Commands V.24/General Bit Mapped Options Status Indicates the status of command options. Only bits 3, 4, and 5 are used, read-only. Bits 3-4 DTR behavior (&Dn) &D0 selected &D1 selected &D2 selected (Default) &D3 selected Bit 5 DCD behavior (&Cn)
  • Page 35 Compaq V.90 Integrated Modem Commands V.34 Modulation Enable/Disable This register enables/disables V.34 modulation. 0 = disabled, 1-255 = enabled Range: 0-255 Default: Inactivity Timer S30 specifies the length of time (in minutes) that the modem will wait before disconnecting when no data is sent or received.
  • Page 36 Compaq V.90 Integrated Modem Commands Dial Line Rate (default 0) This register sets the maximum line data rate. In K56flex and V.90 mode, S37 controls the upstream V.34 rate. S37 = 0 auto rate S37 = 1 reserved S37 = 2...
  • Page 37 Compaq V.90 Integrated Modem Commands S38 = 6 40000 bits/s S38 = 7 42000 bits/s S38 = 8 44000 bits/s S38 = 9 46000 bits/s S38 = 10 48000 bits/s S38 = 11 50000 bits/s S38 = 12 52000 bits/s...
  • Page 38 Compaq V.90 Integrated Modem Commands LAPM Error Control and Feature Negotiation (default 7) This is a non-operational command that is included for compatibility with older programs. Use the \N command to change EC protocol behavior. S89 Timer to Control Sleep Mode This command displays the number of seconds of inactivity (no characters sent from the DTE, no RING) in the off-line command state before the modem places itself into standby mode.

  • Page 39: At Fax Command Set

    Compaq V.90 Integrated Modem Commands AT FAX Command Set Class 1 FAX Commands The Lucent Technologies HSM Data/FAX Complete Chip Set supports FAX commands conforming to EIA standard 578. These commands are given here with short descriptions; complete explanations are given in the standard, available from the Electronic Industry Association.

  • Page 40: At Fax Command Set Descriptions

    Compaq V.90 Integrated Modem Commands AT FAX Command Set Descriptions +FCLASS? Service Class Indication This command causes the modem to display the current setting. The modem can operate either as a Class 0 data modem or a class 1 FAX modem.
  • Page 41 Compaq V.90 Integrated Modem Commands +FTM=<m> Transmit FAX Data with <m> Carrier This command causes the modem to transmit data at the modulation specified by <m>. The following chart shows the values you can enter for this command and the meaning of those values.
  • Page 42 Compaq V.90 Integrated Modem Commands +FTH=<m>Transmit HDLC Data with <m> Carrier This command causes the modem to transmit data framed in the HDLC protocol at the modulation specified by <m>. Command Option Modulation Speed (bits/s) +FTH=3 V.21 Channel 2 +FTH=24 V.27ter...
  • Page 43 Compaq V.90 Integrated Modem Commands +FPR=<n> Select Fax port rate This command sets the DTE to DCE fax port rate. DTE command DCE action Description or notes +FPR = 0 Execute +IPR = 0 Select automatic rate detection +FPR = 1...
  • Page 44 Compaq V.90 Integrated Modem Commands Note: The +FAA parameter controls automatic switching only from Class 1 to Class 0 for call answering only. It does not affect call origination, switching to Class 1 from other classes, or switching to classes other than Class 0.

  • Page 45: V.25Ter At Command Set

    Compaq V.90 Integrated Modem Commands V.25ter AT Command Set These +GMx commands are required by Microsoft PC98 specifications: Manufacturer Identification (+GMI?) Version/Revision Information (+GMR?) Modem Identification (+GMM?) The chip set supports the following functionalities of the V.25ter for a H.324 call: The modified function of the ATD command when issued while the analog voice connection is established.

  • Page 46: V.80 At Command Set

    Compaq V.90 Integrated Modem Commands V.80 AT Command Set The chip set supports the Synchronous Access Mode and most of the commands specified in V.80 standards. The commands are either AT commands issued in the command mode, or in-band commands transmitted in the data stream. These in-band commands are delimited by the hexadecimal characters EM (or numerically, 19h.)

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