HP Compaq Presario Bedienungsanleitung

White Paper

July 1999

0203-0799-A

Prepared by

Portable Marketing Services

Compaq Computer Corporation

Contents

Using Modem Commands ..........3

Entering a Command.................3

Editing and Executing a

Command...............................3

Omitting a Parameter in a

Command Line.......................3

Repeating a Command..............3

Understanding Result Codes.....4

Using Online Mode....................4

Escaping from an Online

Session to the Command

Mode......................................4

Creating a Command Mode

Shortcut..................................4

Creating a Command Mode

Icon ........................................4

AT Command Set ........................6

AT Data Command Set

Summary................................6

Result Code Summary...............7

AT Command Descriptions........9

S Registers.................................24

Setting S Register Default

Values..................................24

Modifying an S Register...........24

Reading an S Register.............24

S-Register Summary ...............25

S-Register Descriptions...........26

Compaq Global Mini PCI 56k (V.90)

Modem by 3Com

Compaq Global Mini PCI 10/100

LAN + 56k (V.90) Modem by 3Com

Modem Commands

Abstract: This document includes comprehensive coverage of the

following topics:

• AT command set used to control modem functionality at an

advanced level

• S-registers used to control modem functionality at and advanced

level

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Notice

The information in this guide is subject to change without notice.

COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR

EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN; NOR FOR INCIDENTAL OR

CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR USE

OF THIS MATERIAL.

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.

COMPAQ and ARMADA are registered in the U.S. Patent and Trademark Office.

Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation.

The software described in this guide is furnished under a license agreement or nondisclosure agreement.

The software may be used or copied only in accordance with the terms of the agreement.

Product names mentioned herein may be trademarks and/or registered trademarks of their respective

companies.

Modem Commands Document

Compaq V.90 Integrated Modem Commands

White Paper prepared by Portable Marketing Services

First Edition (July 1999)

Document Number 0203-0799-A

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0203-0799-A

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/, A>, and +++

commands) with the attention (AT) code characters; otherwise, the modem will not execute

the command.

• Type commands following the AT prefix in uppercase or lowercase letters or a combination

of both.

• Always type the AT prefix in the same case (not At or aT).

• Enter telephone numbers with or without punctuation; for example,

(123) 456-7890 or 1234567890

Editing and Executing a Command

If you make an error while typing a command, simply backspace over the mistake, then retype.

You cannot backspace over the AT prefix because it is interpreted immediately after it is typed.

To execute a command line, press the Enter key. (Pressing the Enter key tells the modem to

process the command line.)

Omitting a Parameter in a Command Line

If you enter a command that normally includes a numeric parameter, such as ATHn, without the

numeric parameter, the missing parameter is assumed to be the default parameter.

For example, the Hn (hang-up) command can have a numeric parameter of zero (H0),which is the

default, or of one (H1);however, if the parameter is missing, ATH plus the Enter key is the

equivalent of ATH0 plus the Enter key. This rule does not apply to the D (dial) command.

Repeating a Command

You can repeat the last command line issued by entering the A/ command. Because it also repeats

the AT prefix and the Enter key function, you are not required to enter the AT prefix or press the

Enter key when repeating this command.

The last command entered remains in the command buffer until the modem is reset or power to

the modem is turned off. Both actions clear the buffer and make the A/ command invalid since

there is no command for the modem to repeat.

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Understanding Result Codes

A result code is the modem response to a command. It may be issued in either of two possible

formats: words (the long form, also known as verbose) or numeric characters (the short form,

represented by digits). The result code format is set using the Vn command:

• V1 for words (default)

• V0 for numeric characters

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.

Escaping from an Online Session to the Command Mode

Use the following steps to break out of a data transfer session (online mode) and return to

command mode:

1. Press and hold the Shift key and type +++.

2. An OK result code is displayed.

3. Enter modem commands as needed.

4. Resume online session by entering AT0 command or terminate the connection with the

ATH0 command.

Creating a Command Mode Shortcut

An easy way to issue commands to the modem is via HyperTerminal, included with Windows 95,

Windows 98, and Windows NT. You can create a shortcut for accessing HyperTerminal and

sending commands to the modem. To create a command mode shortcut on the Windows desktop:

1. Create a Command Mode icon.

2. From the HyperTerminal dialog box, click the Command icon.

3. Select File ➪Create Shortcut

Click the right mouse button.

4. A Command Mode Shortcut icon is displayed.

5. Select and drag the shortcut icon to the desktop.

6. To quit HyperTerminal, Select File ➪Exit.

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Creating a Command Mode Icon

To create a command mode icon using HyperTerminal:

1. If you are using Windows 95 or Windows NT:

select Start ➪Programs ➪Accessories ➪HyperTerminal.

If you are using Windows 98:

select Start ➪Programs ➪Accessories ➪Communications ➪HyperTerminal.

2. Double-click the Hypertrm.exe icon.

3. The Connection Description dialog box is displayed.

4. Type Command in the Name option.

5. Click OK.

6. The Phone Number dialog box is displayed.

7. Select Connect Using

➪Direct to COM2.

8. Click OK.

9. The Modem Port Settings dialog box is displayed.

10. Click OK.

11. The command mode screen is displayed with a blinking cursor in the upper-left corner.

Commands can now be sent to the modem, and the modem responds with a result code.

12. Click File, then Save to save the session.

13. Click File, then Exit to quit.

14. A command mode icon is displayed in the HyperTerminal dialog box.

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AT Command Set

AT Data Command Set Summary

Command Description Command Description

$ Display online command list &$ Display online help for & command

+++ Escape to online command mode &A Result code control

/ Pause &B DTE speed

A/ Repeat last command &C Data Carrier Detect (DCD) control

A> Continuously repeat last command &D Data Terminal Ready (DTR)

control

A Answer command &F Set factory profiles

B U.S./ITU-T Answer Sequence &G Guard tone control

D Dial command &H Flow control for transmitted data

E Character echo command &I Flow control for received data

F Online echo command &K Data compression control

H Hook control &M Error correction control

I Identification/checksum option &N Link speed control

L Speaker volume &R RTS control

M Speaker control &S Data Set Ready (DSR) option

O Return to online data mode &U Link rate control

Q Result code control &W Store active profile

S Read/write an S-Register &Y Set break handling

S$ Display online help &Z Store telephone number

V Result code form

X Result code selection and

functions

Y Select power-on/reset default

configuration

Z Reset and recall stored profile

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Result Code Summary

Result Code Numeric Description

OK 0 Command executed

CONNECT 1 Modem connected to line

RING 2 A ring signal has been detected

NO CARRIER 3 Modem lost carrier signal, or does not detect carrier signal,

or does not detect answer tone

ERROR 4 Invalid command

CONNECT 1200 EC* 5 Connection at 1200 bits/s

NO DIALTONE 6 No dial tone detected

BUSY 7 Busy signal detected

NO ANSWER 8 Remote end never answered

CONNECT 2400 10 Connection at 2400 bits/s

CONNECT 9600 13 Connection at 9600 bits/s

CONNECT 4800 18 Connection at 4800 bits/s

CONNECT 7200 20 Connection at 7200 bits/s

CONNECT 12000 21 Connection at 12000 bits/s

CONNECT 14400 25 Connection at 14400 bits/s

CONNECT 16800 43 Connection at 16800 bits/s

CONNECT 19200 85 Connection at 19200 bits/s

CONNECT 21600 91 Connection at 21600 bits/s

CONNECT 24000 99 Connection at 24000 bits/s

CONNECT 26400 103 Connection at 26400 bits/s

CONNECT 28800 107 Connection at 28800 bits/s

CONNECT 31200 151 Connection at 31200 bits/s

CONNECT 33600 155 Connection at 33600 bits/s

CONNECT 33333 182 Connection at 33333 bits/s

Continued

*EC only appears when the extended result codes configuration option is enabled. EC is replaced by one of the

following symbols, depending upon the error control method used:

• V.42bis—V.42 error control and V.42bis data compression

• V42—V.42 error control only

•

MNP

5—

MNP

class 4 error control and

MNP

class 5 data compression

•

MNP

4—

MNP

class 4 error control only

• NoEC—No error control protocol

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Result Code Summary

continued

Result Code Numeric Description

CONNECT 37333 186 Connection at 37333 bits/s

CONNECT 41333 190 Connection at 41333 bits/s

CONNECT 42666 194 Connection at 42666 bits/s

CONNECT 44000 198 Connection at 44000 bits/s

CONNECT 45333 202 Connection at 45333 bits/s

CONNECT 46666 206 Connection at 46666 bits/s

CONNECT 48000 210 Connection at 48000 bits/s

CONNECT 49333 214 Connection at 49333 bits/s

CONNECT 50666 218 Connection at 50666 bits/s

CONNECT 52000 222 Connection at 52000 bits/s

CONNECT 53333 226 Connection at 53333 bits/s

CONNECT 54666 230 Connection at 54666 bits/s

CONNECT 56000 234 Connection at 56000 bits/s

CONNECT 57333 238 Connection at 57333 bits/s

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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.

A pause, the length of which is set by the Escape Guard Time (S12), must be used after

an escape sequence is issued. This pause prevents the modem from interpreting the

escape sequence as data.

The value of the escape sequence character may be changed using Register S2.

$ Display AT Command List

Displays a basic AT command list as well as online Help.

A/ Repeat Last Command

Causes the modem immediately to repeat the previous command such as redialing a

telephone number. The previously executed command remains in the command buffer

until AT is entered or power is turned off. Both actions clear the buffer and make the A/

command invalid since there is no command to repeat. It is not necessary to enter either a

<cr> or AT.

A> Repeat Last Command

Causes the modem to continuously repeat the previous command such as redialing a

telephone number. It is not necessary to enter either a <cr> or AT.

A Answer Command

Causes the modem to answer a call without waiting for a ring. This is useful in manually

answering a call or when making a direct connection with another modem.

Bn Communication Standard Setting

This command is used to answer certain types of calls. A setting of "0" causes the

modem to use the standard ITU-T answer sequence. This is required to answer all V.34

type calls, as well as calls from overseas. A setting of "1" is commonly used to answer

legacy HST-type calls. It should not be used to answer V.34 calls.

B0 ITU-T V.34 answer sequence (default).

B1 U.S answer tone.

Result Codes:

OK n = 0, 1.

ERROR Otherwise.

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Dn Dial

This is the standard Dial command, which is commonly appended with "T" or "P" for

tone or pulse dialing, respectively.

The following may be used as dial string modifiers:

n Phone number, 0 through 9.

L Redials last number. Should be the first character following ATD, ignored

otherwise.

P Pulse dialing.

T Touch-Tone dialing.

R Call an originate-only modem.

, Pause during dialing. Pause for time specified in Register S8 before processing

the next character in the dial string.

W Wait for dial tone. Modem waits for a second dial tone before processing the dial

string.

@ Wait for answer.

! Hook flash. Causes the modem to go on-hook for 0.5 second and then return to

off-hook.

# Auxiliary tone dial digit.

* Auxiliary tone dial digit.

; Return to command mode. Causes the modem to return to command mode after

dialing the number without disconnecting the call.

S=n Dial a telephone number previously stored using the &Zn=x command (see the

&Zn=x Store Telephone Number command for further information). The range

of n is 0 - 3.

& Wait for credit card bong.

$ Display list of dial commands.

En Character Echo Command

This command controls whether the characters entered from your computer keyboard are

echoed back to your monitor while the modem is in command mode.

E0 Turn command echo off..

E1 Turn command echo on (default).

Result Codes:

OK n = 0, 1.

ERROR Otherwise.

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