Western Telematic MT5634, MT9234 User Manual

WTI Part No. 13513

Rev. B

MT5634/MT9234

Internal Modem

AT Command Set

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

2. AT Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Escape AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

4. S-Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Result Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Remote Configuration and Country Code Configuration

6.1. Remote Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.1.1. Basic Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.1.2. Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.1.2.1. Changing the Setup Password . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

6.1.2.2. Changing the Remote Escape Character . . . . . . . . . . . . . . . . . . 6-2

6.2. Country Code Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

. . . . . . . . . . . . . . . . . . . . . 6-1

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i

MT5634/MT9234 Modem; AT Command Set

ii

1. Introduction

The AT commands are used to control the operation of your modem. They are
called AT commands because the characters AT must precede each command
to get the ATtention of the modem.

AT commands can be issued only when the modem is in command mode or
online command mode.

• The modem is in command mode whenever it is not connected to another
modem.

• The modem is in data mode whenever it is connected to another modem
and ready to exchange data. Online command mode is a temporary state in
which you can issue commands to the modem while connected to another
modem.

• To put the modem into online command mode from data mode, you
must issue an escape sequence (+++) followed immediately by the AT
characters and the command, e.g., +++ATH to hang up the modem. To
return to data mode from online command mode, you must issue the
command ATO.

To send AT commands to the modem you must use a communications
program, such as the HyperTerminal applet in Windows 98 and NT 4.0, or
some other available terminal program. You can issue commands to the modem
either directly, by typing them in the terminal window of the communications
program, or indirectly, by configuring the operating system or communications
program to send the commands automatically. Fortunately, communications
programs make daily operation of modems effortless by hiding the commands
from the user. Most users, therefore, need to use AT commands only when
reconfiguring the modem, e.g., to turn auto answer on or off.

The format for entering an AT command is AT
and n is the specific value for the command, sometimes called the command
parameter. The value is always a number. If the value is zero, you can omit it
from the command; thus, AT&W is equivalent to AT&W0. Most commands
have a default value, which is the value that is set at the factory. The default
values are shown in Section 3.

You must press [Enter] (it could be some other key depending on the terminal
program) to send the command to the modem. Any time the modem receives a
command, it sends a response known as a result code. The most common result
codes are OK, ERROR, and the CONNECT messages that the modem sends
to the computer when it is connecting to another modem. See a table of valid
result codes at the end of this chapter.

Xn, where X is the command

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MT5634/MT9234 Modem; AT Command Set

You can issue several commands in one line, in what is called a command
string. The command string begins with AT and ends when you press [Enter].

Spaces to separate the commands are optional; the command interpreter
ignores them. The most familiar command string is the

initialization string,
which is used to configure the modem when it is turned on or reset, or when
your communications software calls another modem.

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2. AT Command Summary

Organization of AT Commands on the following pages: 1st, by the initial
command character (&, +, %), 2nd, alphabetized by the second command
character (Except for listing of AT).

Command Description

AT Attention Code
A Answer
A/ Repeat Last Command
Bn Communication Standard Setting
Ds Dial
DS=y Dial Stored Telephone Number
En Echo Command Mode Characters
Fn Echo Online Data Characters
Hn Hook Control
In Information Request
Mn Monitor Speaker Mode
Nn Modulation Handshake
On Return Online to Data Mode
P Pulse Dialing
Qn Result Codes Enable/Disable
Sr=n Set Register Value
Sr? Read Register Value
T Tone Dialing
Vn Result Code Format
Wn Result Code Options
Xn Result Code Selection
Zn Modem Reset
&Cn Data Carrier Detect (DCD) Control
&Dn Data Terminal Ready (DTR) Control
&En XON/XOFF Pass-Through
&Fn Load Factory Settings
&Gn V.22bis Guard Tone Control
&Kn Flow Control Selection
&Ln Leased Line Operation
&Pn Pulse Dial Make-to-Break Ratio Selection
&Qn Asynchronous Communications Mode
&Sn Data Set Ready (DSR) Control
&Tn Loopback Test (V.54 Test) Commands
&V Display Current Settings
&Wn Store Current Configuration
&Zy=x Store Dialing Command
\An Select Maximum MNP Block Size

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MT5634/MT9234 Modem; AT Command Set

Command Description

\Bn Transmit Break
\Kn Break Control
\Nn Error Correction Mode Selection
\Qn Flow Control Selection
\Tn Inactivity Timer
\Vn Protocol Result Code

-Cn Data Calling Tone
%An Adaptive Answer Result Code Enable
%B View Numbers in Blacklist
%Cn Data Compression Control
%DCn AT Command Control
%En Fallback and Fall Forward Control
%Hn Direct Connect Enable
%Rn Cisco Configuration
%Sn Command Speed Response
$EBn Asynchronous Word Length
$Dn DTR Dialing
$MBn Online BPS Speed
$SBn Serial Port Baud Rate
#CBAn Callback Attempts
#CBDn Callback Delay
# CBF? Callback Failed Attempts Display
# CBFR Callback Failed Attempts Reset
# CBIn Local Callback Inactivity Timer

# CBNy=n Store Callback Password
# CBPn Callback Parity
# CBRy Callback Security Reset
# CBSn Callback Enable/Disable
#Pn Set 11-bit Parity

#Sx Enter Setup Password

#S=x Store Setup Password

+VDR=x, y Distinctive Ring Report
+++AT<CR>
%%%ATMTSMODEM<CR> Remote Configuration Escape Sequence

Escape Sequence

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3. AT Commands

Command: AT Attention Code

Values: N/A
Description: The attention code precedes all command lines except

A: and escape sequences.

Command: [Enter] Key

Values: N/A
Description: Press the
commands.

[Enter] (RETURN) key to execute most

Command: A Answer

Values: N/A
Description: Answer call before final ring.

Command: A/ Repeat Last Command

Values: N/A
Description: Repeat the last command string. Do not precede this
command with AT. Do not press

[Enter] to execute.

Command: Bn Communication Standard Setting

Values: n = 0–3, 15, 16
Default: 0 and 15
Description: B0 Select ITU-T V.22 mode when modem is at 1200 bps.
B1 Select Bell 212A when modem is at 1200 bps.
B2 Deselect V.23 reverse channel (same as
B3 Deselect V.23 reverse channel (same as
B15 Select V.21 when the modem is at 300 bps.
B16 Select Bell 103J when the modem is at 300 bps.

A/,

B3).
B2).

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MT5634/MT9234 Modem; AT Command Set

Command: Ds Dial

Values: s = dial string (phone number and dial modifiers)
Default: none
Description: Dial telephone number
and include the 0–9, *, #, , B, C, and D characters, and the L, P, T,
V, W, S, comma (,), semicolon (;), !, @, ^ and $ dial string
modifiers.
Dial string modifiers:
L Redial last number. (Must be placed immediately
after ATD

number. Use ATH

(X2, X4, X5, X6, or X7 must be selected.)

of dial string.)

one-half second, then off-hook again.

ringback, then 5 seconds of silence, before
processing next part of command. If silence is not
detected, the modem returns a NO ANSWER code.

follow the phone number and precede the user’s call card
number: ATDT1028806127853500$123456789

P Pulse-dial following numbers in command.
T Tone-dial following numbers in command (default).
V Switch to speakerphone mode and dial the following

W Wait for a new dial tone before continuing to dial.

, Pause during dialing for time set in register S8.
; Return to command mode after dialing. (Place at end

! Hook flash. Causes the modem to go on-hook for

@ Wait for quiet answer. Causes modem to wait for a

^ Disable data calling tone transmission.
$ Detect AT&T call card “bong” tone. The character should

s, where s may up to 40 characters long

.)

command to hang up.

Command: DS=y Dial Stored Telephone Number

Values: y = 0–2 (0–1 for SMI-Parallel {internal})
Default: none
Description: Dial a number previously stored in directory number

&Zy=x command. Example: ATDS=2

y by the

Command: En Echo Command Mode Characters

Values: n = 0 or 1
Default: 1
Description: E0 Do not echo keyboard input to the terminal.
E1 Do echo keyboard input to the terminal.

Command: Fn Echo Online Data Characters

Values: n = 1
Default: 1
F0 Enable online data character echo. (Not supported.)
F1 Disable online data character echo (included for
backward compatibility with some software).

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AT Commands

Command: Hn Hook Control

Values: n = 0 or 1
Default: 0
Description: H0 Go on-hook (hang up).
H1 Go off-hook (make the phone line busy).

Command: In Information Request

Values: n = 0–5, 9, 11
Default: None
Description: I0 Display default speed and controller firmware version.
I1 Calculate and display ROM checksum (e.g., 12AB).
I2 Check ROM and verify the checksum, displaying
or
I3 Display default speed and controller firmware version.
I4 Display firmware version for data pump (e.g., 94).
I5 Display the board ID: software version, hardware
version, and country ID
I9 Display the country code.
I11 Display diagnostic information for the last modem
connection, such as link type, line speed, serial speed,
type of error correction/data compression, number
of past retrains, etc.

ERROR.

OK

Command: Mn Monitor Speaker Mode

Values: n = 0, 1, 2, or 3
Default: 1
Description: M0 Speaker always off.
M1 Speaker on until carrier signal detected.
M2 Speaker always on when modem is off-hook.
M3 Speaker on until carrier is detected, except while dialing.

Command: Nn Modulation Handshake

Values: n = 0 or 1
Default: 1
Description: N0 Modem performs handshake only at communication
standard specified by S37 and the
N1 Modem begins handshake at communication standard
specified by S37 and the
fallback to a lower speed can occur.

B command. During handshake,

B command.

Command: On Return Online to Data Mode

Values: n = 0, 1, 3
Default: None
Description: O0 Exit online command mode and return to data mode
(see +++AT<CR>
O1 Issue a retrain and return to online data mode.
O3 Issue a rate renegotiations and return to data mode.

escape sequence).

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