Compaq Armada 7300, Armada 7400, Armada 7700, ARMADA 7000 Series Command Manual

:
+,7(
3
$3(5
October 1997 Prepared By
Computer Corporation
ONTENTS
C
chapter 1 Using Modem
Commands.............. 3
chapter 2 Basics of Cellular Phone
Use .......................... 7
chapter 3 Basics of Digital Simultaneous Voice and Data
(DSVD)..................... 8
chapter 4
AT Commands....... 11
chapter 5
S Registers............. 33
chapter 6
Dial Modifiers......... 47
chapter 7 Hexadecimal to ASCII Conversion
Table..................... 49
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C
RMADA
A
ERSONAL
P
M
ODEM
OMMANDS
7000 F
OF
OMPUTER
C
AMILY
S
:
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(cont.)
.
OTICE
N
. . . .
The information in this document is subject to change without notice.
. .
COMPAQ COMPUTER COR POR AT I ON SHAL L NOT BE LIABLE FOR TECHNICAL OR
.
EDITORIAL E R R ORS OR OMI SSIONS C ONT AI NE D HEREIN; NOR FOR INCIDENT AL OR
.
CONSEQUENTIAL DAMAGES RESULTING FROM THE FUR NISHI NG, PERFORMANCE,
.
OR USE OF THIS MATERIAL.
. .
This document 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 LTE are registered in the U. S. Patent and Trademark Office.
. .
Armada is a trademark of Compaq Computer Corporation.
.
Microsoft and Windows are registered trademarks of Microsoft Corporation.
. .
The software described in this document 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.
.
©1997 Compaq Computer Corporation. All rights reserved. Printed in the U.S.A
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Modem Commands Document
.
Armada 7000 Family of Personal Computer
. .
First Edition (October 1997)
.
ECG056.1097
.
s
. . . .
:
+,7(3$3(5
(cont.)
OTE
N
:
The modem ignores al l characters that precede AT .
OTE
N
:
A maximum of 255 char acters can follow t he AT command. The modem doesn't count t he AT prefix or carri age r eturn (<cr>) character. It does count, but doesn't act on, punctuation such as quotation mar k s and tildes. If a command sequence exceeds the 255-character maxim um , the modem does not execute any part of the command line and returns an error message after the <cr>. If this occurs, reentering the command withi n the 255­character limit executes the command.
OTE
N
:
Punctuation in the telephone number does take up space set aside for command storage.
OTE
N
:
Word codes are preceded and followed by the characters set in registers S3 and S4, which are typically the factory defaults: a carriage return and a line feed (LF) cont r ol character, respectively.
.
CHAPTER 1— U
.
SING MODEM COMMANDS
. . .
Entering a Command
. .
Use the following guidelines when issuing modem commands:
.
xWhen 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.Compaq Hardware
xType commands following the AT prefix in uppercase or lowercase letters or a combination
of both.
xAlways type the AT prefix in the same case (not At or aT).
.
xEnter 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
.
process the command line.)
.
Enter
key. (Pressing the
Enter
key tells the modem to
. . .
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
.
the default, or of one
.
equivalent of
.
ATH0
(H1);
plus the
however, if the parameter is missing,
Enter
key. This rule does not apply to the D (dial) command.
ATH
plus the
H0),
(
Enter
which is
key is the
. .
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
. .
press the
Enter
key when repeating this command.
Enter
key function, you are not requi re d to e nt er t he AT prefi x or
. .
The last previously entered command 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.
. . .
Understanding Result Codes
. .
A result code is modem response to a command and 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 (default) for words.
. . . .
OTE
N
:
Numeric characters are followed by a carriage return.
OTE
N
:
The word modem comes from the process of MOdulation/ DEModulation.
OTE
N
:
The escape code sequence (+++) must be typed wi thin one second, or as defined in t he Escape Code Guard Time found in S12.
NOTE:
To hang up the modem,
type ATH0 and pres s
Enter.
:
+,7(3$3(5
(cont.)
. . . . .
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:
. .
Press and hold the
. .
An OK result code is displayed.
. .
Enter modem commands as needed.
. .
Resume online session by entering AT0 command or terminate the connection with the ATH0
.
command.
.
Shift
key and type +++
. .
Creating a Command Mode Shortcut
. .
An easy way to issue commands to the modem is via HyperTerminal, included with Windows 95
.
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.Click File==>Create Shortcut
. . . . . .
or Click the right mouse button.
A Command Mode Shortcut icon is displayed.
4.Click and drag the shortcut icon to the desktop.
.
5.To quit HyperTerminal, click File==>Exit.
. . . . . . . . . . . . . .
NOTE:
The internal m odem us es the COM2 port in the system.
NOTE:
To hang up the modem, type ATH0 and press
Enter.
:
+,7(3$3(5
(cont.)
. . .
Creating a Command Mode Icon
.
To create a command mode icon using HyperTerminal:
. .
1.Click Start==>Programs==>Accessories ==> HyperTerminal.
. .
2.Double-click the Hypertrm.exe icon.
. . . .
The Connection Description dialog box is displayed.
3.Type Command in the Name option.
.
4.Click OK.
. . . . . . . . . . . . . . . . . .
The Phone Number dialog box is displayed.
5.Click Connect Using==>Direct to Com 2.
6.Click OK. The Modem Port Settings dialog box displayed.
7.Click OK. The command mode scre e n is displa ye d with a bl inki ng c ursor in the uppe r-le ft corne r.
Commands can now be sent to the m ode m, a nd t he m ode m re sponds with a re sult c ode .
8.Click File, then Save to save the session.
9.Click File, then Exit to quit. A command mode icon is displa ye d in t he HyperTe rm ina l dia l og box.
. . .
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.
. . .
Modifying an S Register
. .
You can modify or change the value of an S register from Command Mode (Terminal Mode) or
.
from a standard data or fax communication application. For example:
. .
xType
. . . .
xIf you then enter AT = 95. it resets S11 to a value of 95, since the modem remembered that
. .
xIf you enter an S = command with no parameter (value), the register number defaults to zero
. . . .
ATS11=70
This sets S11 to a value of 70.
S11 was the last register referenced.
and the modem changes the value of
ATS0 = 3 and ATS = 3.
then press
Enter.
S0.
Therefore, the following commands are equivalent:
. . . . . .
:
+,7(3$3(5
(cont.)
.
Reading an S Register
. .
To read the contents of a given S register in the terminal mode (command mode), type ATSn?
.
(where “n” is the number of the re giste r) t hen pre ss Enter.
. .
When modifying a register, the modem also remembers the location of the last inquiry. For
.
example, the following sequence of commands display the contents of the S11 register.
. .
ATS11?
. .
AT?
. .
When you use an S? with no value, the re giste r num ber de fa ult s to z ero a nd t he m ode m re sponds
.
with the value of S0 (for exampl e
.
This
This command also displays the value of S11.
command d isplays the value of S11.
ATS?
).
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE:
Use Windows HyperTerminal to enter Command M ode and register the phone w ith the modem.
NOTE: $M3
is not support e d by this
modem.
:
+,7(3$3(5
(cont.)
. . .
CHAPTER 2— B
.
ASICS OF CELLULAR PHONE USE
. . .
Connecting the Modem to a Cellular Phone
.
The internal modem installed in the Armada 7000 Family of Personal Computers allows you to
. .
connect a cellular phone in North America to your computer using an optional cable and the 25-
.
pin connector on the computer. There are AT commands associated with setting up and
.
optimizing a cellular connection.
. . . . . . . .
CAUTION:
modem. Contact your Compaq authori zed dealer , r esel l er , or s ervi ce provider for inform ati on on pur chasi ng a cel lul ar cabl e desi gned f or t hi s modem. For a list of phone cabl es that ar e compat i bl e with your m odem, refer to “Compatible Cell ul ar Phones with Compaq Cables ” i n the Online Reference Guide that is preinstalled on your com puter .
Using the wrong cable could cause permanent dam age t o the
. .
Choosing Cellular Direct Components
. .
If you are using a cellular phone, you need to purchase the following items separately:
. . . . . . .
One of the models of cellular phones supported by this modem.
x
Cellular phone connection cable. (Contact your Compaq authorized reseller or service
x
provider.) Cellular airtime. (Contact a cellular carrier in your area.)
x
. . .
Registering the Phone with the Modem
. .
When the modem was installed at the factory, it was not programmed to automatically expect a
.
cellular phone connection. If you anticipate using a cellular phone with the modem, proceed as
.
follows to register or setup the cellular phone with the modem.
. . . . . .
Use
x
Use
x
Use
x
if you are using a Motorola, JVC, or Pionee r phone
$M1
if you are using a Nokia, Technophone, AT&T (selected models), or Tandy phone
$M2
if you are using a GE or Ericsson phone
$M4
.
.
.
This command needs be to issued only once; thereafter, the modem checks for the presence of
.
the phone. If a cellular phone is connected, the modem dials through the cellular phone;
. .
otherwise, it uses a standard (RJ-11) telephone connector.
. . . . . . . . . . . . . . . .
.
:
+,7(3$3(5
(cont.)
. . .
CHAPTER 3— B
. .
(DSVD)
.
ASICS OF DIGITAL SIMULTANEOUS VOICE AND DATA
. .
Digital Simultaneous Voice and Data Using AT Commands
. .
The internal modem is equipped for digital simultaneous voice and data (DSVD) connections
.
with oth e r DSVD c o m p atible modems, as well as for voice-only and data-only calls. Using
.
DSVD technology, and the computer’s speakerphone capability, a voice call can be added during
. .
a data transfer, or computer information can be sent during a voice conversation, all over a single
.
phone line.
. .
The speakerphone must be enabled for you to hear the voice portion of a DSVD voice and data
.
call. The speakerphone is automatically turned on when the following applications are started:
. .
xWindows HyperTerminal
.
xMicrosoft NetMeeting
. .
xIntel ProShare
. . .
Using Windows or DSVD Application Software
. .
The following instructions appl y when you a re using m ode m dri ve rs from Wi ndows to
.
communicate with the modem. If you are using a communications application other than
. .
Windows to initiate a DSVD call, refer to the software documentation for instructions on
.
manually entering AT commands.
. .
If you are running Windows:
.
1.Click Start==>Settings==>Control Panel==>double-click Modems.
. .
2.Click Properties from the General Tab.
.
3.Click Advanced from the Connection Tab.
. .
4.In the Extra Settings option, type
.
5.Click OK==>OK==>Close, to exit.
. .
The command typed a bove has four part s:
. . . . . . . . .
1)-SSE=1 ena b l e s DSVD o p e r ation.
2)-SSE-AC tells the modem to automatically establish a DSVD session upon connection
to anot h e r DSVD-enabled mode m .
3)-SSE-FN sets the modem to enable a full-duplex speakerphone operation after a DSVD
connection occurs.
4)S0=1 sets the modem to answer on the first incoming ring.
AT-SSE=1-SSE-AC-SSE-FNS0=1
. . . . . . . . . . . .
NOTE: Start==>Programs==>Accessor ies==>HyperTerminal.
NOTE:
When -SSE=1 and s peaker phone are active, the D com m and caus es an automatic change from +FCLASS=8 to + FCLASS=0.
NOTE:
When -SSE=1 and s peaker phone are active, the D com m and caus es an automatic change from +FCLASS=8 to + FCLASS=0.
NOTE:
When -SSE=1 and s peaker phone are active, the D com m and caus es an automatic change from +FCLASS=8 to + FCLASS=0.
NOTE:
When -SSE=1 and s peaker phone are active, the D com m and caus es an automatic change from +FCLASS=8 to + FCLASS=0.
:
+,7(3$3(5
(cont.)
. . .
Using the Command Mode of Windows HyperTerminal
.
xStarting with a Voice Connection
. . . . . . . . . . . . . . . . . . . . .
From the Command Mode of Windows HyperTerminal, follow these instructions. To initiate a voice call:
1.Type
2.Type
3.Type To answer a voice call:
1.Type
2.If the modem is ringing, type
3.Type
AT-SSE=1
The modem responds OK.
AT+FCLASS=8;DTXXXXXXX Enter.
press
ATD
AT-SSE=1
The modem responds OK.
The modem is now in speakerphone mode and you can enter AT commands.
ATD
then press
then press
then press
then press
Enter
to ena ble DSVD operation.
(where X = each digit of the phone number) then
Enter
to ena ble DSVD mode.
Enter
to ena ble DSVD operation.
AT+FCLASS=8;+VLS
Enter
to ena ble DSVD mode.
then press
.
xStarting with a Data Connection
. . . . . . . . . . . . . .
From the Command Mode of Windows HyperTerminal, follow these instructions: To initiate a data call:
1.Type
2.Type
3.Escape to Command Mode by typi ng
4.Type
AT-SSE=1
The modem responds OK.
ATDTXXXXXXX
The modem is now in data mode and you can enter AT commands.
AT+VLS=7;O
then press
then press
Enter
to ena ble DSVD operation.
(where X = each digit of the phone number) then press
Shift+++
Enter
to ena ble DSVD mode.
wait for OK.
. . . . . . . . . . . . . . . .
To answer a data call:
1.Type
2.If the modem is ringing, type
3.Escape to Command Mode by typi ng
4.Type
xChanging from a DSVD Connection to a Data Connection
From the Command Mode of Windows HyperTermi na l:
AT-SSE=1
The modem responds OK. The modem is now in data mode and you can enter AT commands.
The modem is now in data mode and you can enter AT commands.
AT+VLS=7;O
then press
then press
Enter
to ena ble DSVD operation.
ATA
then press
Shift+++
Enter
to ena ble DSVD mode.
Enter.
then wait for OK.
. . . . .
1.Escape to Command Mode by typi ng
2.Type
AT+VLS=0;O
The modem responds OK and is now in data mode.
then press Enter.
Shift+++
then wait for OK.
. . .
Enter.
Enter.
:
+,7(3$3(5
(cont.)
NOTE:
The H command automatically sets FCLASS=0.
. . .
xChanging from a DSVD Connection to a Speakerphone Connection
. . . . . . .
While in DSVD mode from Windows HyperTe rm i na l :
1.Escape to Command Mode by typi ng S hif t+++ then wait for OK.
2.Type AT+VNH=2;H then press Enter.
The modem responds OK and is now in speakerphone mode.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NOTE:
Any command that f ollows the A command on the same command line is ignored.
:
+,7(3$3(5
(cont.)
. . .
CHAPTER 4—AT C
. . . .
Basic AT Commands
. . .
Answer Command (A)
. . . . . . .
This 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. When this command is entered, the modem will attempt to register with a cellular phone (if selected) to receive incoming calls.
Parameters: none
. . .
Attention Code (AT)
. . . .
This command is the command line prefix that tells the modem a command or sequence of commands is being entered. It precedes all commands except the A/ (repeat) and +++ (escape) commands.
. . .
Entered alone, AT causes the modem to respond with OK or 0 if it is ready to receive commands.
. .
Parameters: none
. .
Bell/ITU Mode Selection (B)
. . . .
This command sets the modem to either Bell or ITU mode (1200 bps, 300 bps). Parameters: 0, 1, 2-3, 15, 16
. . . . . . . . . . . .
n = 0 ITU V.22 mode; al so c aus e s B 15 to be pe rformed. n = 1 Bell 212A mode; al so c ause s B16 to be performed
(Default).
n = 2 or 3 V.23 R1200/T75 when modem i s originating; V.23
T1200/R75 when modem i s answering. n = 15 ITU V.21 mode. n = 16 Bell 103 mode.
.
Character Echo (E)
. . . . . . . . . . .
This command disables or enables the local echo of entered characters while the modem is in the command (terminal) mode.
Parameters: n = 0, 1
n = 0 Disables local echo. n = 1 Enables local echo
(Default).
. . . . .

OMMANDS
NOTE:
In pulse dialing, characters A, B, C, D, and # are ignored.
:
+,7(3$3(5
(cont.)
. .
Determine Data Rate Negotiation (N)
. . . . . .
This command determines if the modem performs rate negotiated handshake with remote modem at connection
Parameters: 0, 1
. . . . . . . . . .
n = 0 Automode disabled; handshake only at the rate
specified by the DTE rate. S37, *H, and the J dial
modifier. n = 1 Automode enabled; handshake at or below the rate
specified by the DTE rate. S37, *H, and the J dial
modifier
(Default).
. .
Dial Command (D)
. .
This command causes the modem to dial the number that follows D in the command line.
. .
Identification/Checksum Option (I)
. . . . .
This command interrogates the modem for its product code, checksum, or ROM revision code.
Parameters: 0, 1, 2, 3, 9
. . . . . . . . . . . . . . . . . . . . .
n = 0 n = 1 Requests control firmware checksum (8 bit). n = 2 Verifies control firmware checksum; responds OK or
n = 3 Requests ROM revis i on c ode f ormatt e d as: XXXXXX
n = 9 Requests ROM revision and c o untry code. For
Requests product code
ERROR result code.
NNN PASS (data pump date and revision code)
XXXXXX NNN PASS (ASIC date and revision c o de )
XXXXXX NNN PASS (control firmware date and revision
code). The date codes are i n yymmdd format, and
the revision codes are 3-digit numbers.
example, Compaq N. NN US A w here N. NN de fi nes the
revision code fo r t he ROM and report s the selected
DAA.
. .
Long Space Discon nect (Y)
. . . . . . . .
This command enables/disables the generation and response to long space disconnect. Parameters: 0, 1
n = 0 n = 1 Enables long s p ac e disconnect.
Disables long space disconnect
. . . .

.
(Default)
.
(Default)
.
:
+,7(3$3(5
(cont.)
. .
Negotiation Progress Result Code (W)
. . . . . . . . . . . . . . . . . . . .
This command determines whether or not to return negotiation progress result codes. Parameters: 0, 1, 2
n = 0 DTE speed on CONNECT; CARRIER and PROTOCOL
disabled n = 1 DTE speed on CONNECT; CARRIER and PROTOCOL
enabled. n = 2 DCE speed on CONNECT; CARRIER and PROTOCOL
disabled.
Online Data Mode (O)
This command forces the modem to the online data mode. Use this command to return to the online mode after "escaping" to the command mode.
Parameters: 0, 1, 3
(Default)
. . . .
n = 0 Enters online data mode. n = 1 Enters online data m o de w i th a retrai n.
. .
n = 3 Enters online dat a m o de w ith a rate renegotiation.
. .
Read/Write an S Register (S)
. . . . . . . . . .
This command sets the register r to the specified value n. The Sr? command reads (displays) the value in register r. Parameters:
Range (r): 0-110 Range (n): register specific
.
Recall St ored Profile (Z)
. . . . . . . . . . . .
This command resets the modem, recalls the specified user profile from nonvolatile memory (NVRAM), and places it in the active configuration area.
Parameters: 0, 1
n = 0 Reset modem and recall parameters stored in user
profile 0. n = 1 Reset modem and recall parameters stored in user
profile 1.
.
Repeat Last Command (A/)-
. . . . . . . .
This 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.
. .

.
:
+,7(3$3(5
(cont.)
. .
Parameters: none
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

:
+,7(3$3(5
(cont.)
. .
Result Code (X)
. . . . . . . . . . . .
This command selects the result code set and dialing functions. Parameters: 0, 1, 2, 3, 4, 9
n = 0 Basic result code set
(codes 0-4). The m ode m waits for the period set in register S6 and blind dials. Dial tone and busy tone detection are disabled.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
n = 1 Extended result code set
(codes 0-5, 10-14, 86, and
87). Other features are the same as those for X0, plus CONNECT result codes are enabled.
n = 2 Result c ode s 0-6, 10-14, 86,
and 87. The features are the same as those for X0 and X1 except dial tone detection is enabled. Disconnect occurs and the NO DIAL TONE resul t code is sent if a minimum, 1-second duration dial tone is not detected within 5 se c onds a ft e r going off-hook or after the end of the wait period. Busy tone detection is disabled.
. .
Result Code Display (Q)
. . . . . . . .
This command enables the modem to send result codes. Parameters: 0, 1
n = 0 n = 1 Disa b les return of re s u lt codes.
.
Result Code Form (V)
. . . . . . . .
This command determines the type of result code. The Vn command determines if the result code is sent as words or numbers.
Parameters: 0, 1
n = 0 Resu lt co de is sen t a s n u mbers.
. .

n = 3 Result c ode s 0-5, 10-14, 86,
and 87. The features are the same as those for X0 and X1 except busy tone detection is enabled. The modem disconnects and sends a BUSY result code if a busy tone is detected. Dial tone detection is disabled.
n = 4 Result c ode s 0-7, 10-14, 86,
and 87. Both busy tone and dial tone detectio n are enabled
n = 9 Result c ode s 0-7, 10-14, 25,
26, 86, 87. Both busy tone and dial tone detectio n are enabled.
Enables output of result codes
(Default)
(Default)
.
.
:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+,7(3$3(5
n = 1
(cont.)
Result code is sent as words (Default).
NOTE:
To turn off the speaker completely, us e the M0 command.
:
+,7(3$3(5
(cont.)
. .
Speaker Control (M)
. . . . . . . .
Parameters: 0, 1, 2, 3
n = 0 Always off. n = 1 n = 2 Always on.
On until carrier is de tect ed
. .
n = 3 On a ft er d ia lin g; of f wh en carrier d etect ed .
. .
Speaker Volu me (L)
. . . . .
This command has no effect on modem operation. However, it will be accepted for compatibility. Speaker volume is controlled by the host computer.
Parameters: n = 0, 1, 2, 3
. .
Switch Hook Control (H)
. . . . . . .
This command initiates a hang-up sequence. When the H1 command is entered, the modem will attempt to register with a cellular phone (if selected) to receive incoming calls. If a cellular phone is found, an ERROR result is returned since it is not possible to go off-hook with a cellular phone. While ERROR is returned, the modem is registered with the cellular phone. Ignore the ERROR result i n thi s ca se.
. .
Parameters: 0, 1
. . . . .
n = 0 n = 1 Modem will go off-hook; it will pick up the telephone
The modem will go on-hook; it will hang up
line.
. .
Tone Dial (T)
. . .
This command sets the dialing mode to tone. All calls will remain tone until pulse dialing is selected.
. .
Parameters: none
. . .
Ampersand AT& Commands
. . .
Data Carr ier Detect (&C)
. . . .
This command controls the modem's use of the DCD pin of the DTE interface. Parameters: 0, 1, 2
. . . . . . . .
n = 0 DCD always ON. n = 1
n = 2 UNIX compatible DCD control. DCD is always ON
DCD ON only when a data carrier is present
Default)
except for a short time when the carrier is lost.
. . . .

(Default)
.
.
(Default)
(Factory
.
:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+,7(3$3(5
(cont.)
:
+,7(3$3(5
(cont.)
. .
Data Set Ready (&S)
. . . . . . . . . . . . . . . . .
This command selects how the modem will control data set ready (DSR). Parameters: 0, 1, 2
n = 0 n = 1 DSR will become active after answer tone has been
n = 2 DSR will become active at the end of handshake
DSR will remain on at all times
detected and inactive at hang - up.
(before the CONNECT message is issued), and
inactive at hang-up.
Data Terminal Ready (&D)
This command controls the modem use of the DTR pin of the DTE interface.
. .
Parameters: 0, 1, 2, 3
. . . . . . . . . . . .
n = 0 The modem ig no res DTR. n = 1 The modem enters the command mode when the
DTR is turn e d O FF. n = 2 The modem enters the command mode, disables
auto-answer, and hangs up when DTR is turned OFF
(Factory Defa u l t)
n = 3 The modem resets to user-specified configuration
when the DTR is turned OFF.
. .
Error Control and Speed Buffering (&Q)
. . . .
This command selects communications modes. Parameters: 0, 5, 6
. .
n = 0
. . . . . . . . .
n = 5 n = 6 Asynchronous wi t h s p e e d b uf fe ri ng . Allows fixed DTE-
. . .
Asynchronous mode, no speed buffering.
disables all flow control (including modem-to-modem
flow control), suppresses the CARRIER and PROTOCOL
result codes, and causes the CONNECT result code to
indicate the DCE speed regardless of the W
command and register S95 settings.
Error cont ro l mode wit h speed buffe ring
DCE speed to keep applications program from
changing UART data rate to match the modem
transmission rate after connection.
. . . . . .
Reliable communications over cellular networks or other impaired channels require error control. Therefore &Q5 [jump to the Cellular ($S Register) section] should always be in effect when using cellular direct connection or when communicating over impaired noncellular phone lines.
. . . . .

(Default)
.
.
&Q0
(Default)
.
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