Western Telematic Network Card MT5634 User Manual

WTI Part No. 13513  
Rev. A  
MT5634  
Internal Modem  
AT Command Set  
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Table of Contents  
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
2. AT Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
3. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1  
3.1 Escape AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16  
4. S-Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1  
5. Result Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1  
6. Remote Configuration and Country Code Configuration . . . . . . . . . . . . . . . . . . . . . 6-1  
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  
i
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MT5634 Modem; AT Command Set  
ii  
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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 ATXn, where X is the command  
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.  
1-1  
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MT5634 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.  
1-2  
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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  
AT  
Description  
Attention Code  
A
Answer  
A/  
Repeat Last Command  
Communication Standard Setting  
Dial  
Bn  
Ds  
DS=y  
En  
Dial Stored Telephone Number  
Echo Command Mode Characters  
Echo Online Data Characters  
Hook Control  
Fn  
Hn  
In  
Information Request  
Mn  
Monitor Speaker Mode  
Modulation Handshake  
Return Online to Data Mode  
Pulse Dialing  
Nn  
On  
P
Qn  
Result Codes Enable/Disable  
Set Register Value  
Sr=n  
Sr?  
T
Read Register Value  
Tone Dialing  
Vn  
Result Code Format  
Wn  
Xn  
Result Code Options  
Result Code Selection  
Modem Reset  
Zn  
&Cn  
&Dn  
&En  
&Fn  
&Gn  
&Kn  
&Ln  
&Pn  
&Qn  
&Sn  
&Tn  
&V  
Data Carrier Detect (DCD) Control  
Data Terminal Ready (DTR) Control  
XON/XOFF Pass-Through  
Load Factory Settings  
V.22bis Guard Tone Control  
Flow Control Selection  
Leased Line Operation  
Pulse Dial Make-to-Break Ratio Selection  
Asynchronous Communications Mode  
Data Set Ready (DSR) Control  
Loopback Test (V.54 Test) Commands  
Display Current Settings  
Store Current Configuration  
Store Dialing Command  
Select Maximum MNP Block Size  
&Wn  
&Zy=x  
\An  
2-1  
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MT5634 Modem; AT Command Set  
Command  
\Bn  
Description  
Transmit Break  
\Kn  
Break Control  
\Nn  
Error Correction Mode Selection  
Flow Control Selection  
Inactivity Timer  
\Qn  
\Tn  
\Vn  
Protocol Result Code  
Data Calling Tone  
-Cn  
%An  
Adaptive Answer Result Code Enable  
View Numbers in Blacklist  
Data Compression Control  
AT Command Control  
Fallback and Fall Forward Control  
Direct Connect Enable  
Cisco Configuration  
%B  
%Cn  
%DCn  
%En  
%Hn  
%Rn  
%Sn  
Command Speed Response  
Asynchronous Word Length  
DTR Dialing  
$EBn  
$Dn  
$MBn  
$SBn  
#CBAn  
#CBDn  
# CBF?  
# CBFR  
# CBIn  
# CBNy=n  
# CBPn  
# CBRy  
# CBSn  
#Pn  
Online BPS Speed  
Serial Port Baud Rate  
Callback Attempts  
Callback Delay  
Callback Failed Attempts Display  
Callback Failed Attempts Reset  
Local Callback Inactivity Timer  
Store Callback Password  
Callback Parity  
Callback Security Reset  
Callback Enable/Disable  
Set 11-bit Parity  
#Sx  
Enter Setup Password  
#S=x  
Store Setup Password  
+VDR=x, y  
Distinctive Ring Report  
Escape Sequence  
+++AT<CR>  
%%%ATMTSMODEM<CR>  
Remote Configuration Escape Sequence  
2-2  
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3. AT Commands  
Command: AT  
Values:  
Attention Code  
N/A  
Description:  
The attention code precedes all command lines except A/,  
A: and escape sequences.  
Command:  
Values:  
[Enter] Key  
N/A  
Description:  
Press the [Enter] (RETURN) key to execute most  
commands.  
Command:  
Values:  
A
Answer  
N/A  
Description:  
Answer call before final ring.  
Command: A/  
Values:  
Repeat Last Command  
N/A  
Description:  
Repeat the last command string. Do not precede this  
command with AT. Do not press [Enter] to execute.  
Command: Bn  
Values:  
Communication Standard Setting  
n = 0–3, 15, 16  
Default:  
0 and 15  
Description:  
B0  
B1  
B2  
B3  
B15  
B16  
Select ITU-T V.22 mode when modem is at 1200 bps.  
Select Bell 212A when modem is at 1200 bps.  
Deselect V.23 reverse channel (same as B3).  
Deselect V.23 reverse channel (same as B2).  
Select V.21 when the modem is at 300 bps.  
Select Bell 103J when the modem is at 300 bps.  
3-1  
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MT5634 Modem; AT Command Set  
Command: Ds  
Values:  
Dial  
s = dial string (phone number and dial modifiers)  
Default:  
none  
Description:  
Dial telephone number s, where s may up to 40 characters long  
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.)  
P
T
V
Pulse-dial following numbers in command.  
Tone-dial following numbers in command (default).  
Switch to speakerphone mode and dial the following  
number. Use ATH command to hang up.  
Wait for a new dial tone before continuing to dial.  
(X2, X4, X5, X6, or X7 must be selected.)  
Pause during dialing for time set in register S8.  
Return to command mode after dialing. (Place at end  
of dial string.)  
W
,
;
!
Hook flash. Causes the modem to go on-hook for  
one-half second, then off-hook again.  
@
Wait for quiet answer. Causes modem to wait for a  
ringback, then 5 seconds of silence, before  
processing next part of command. If silence is not  
detected, the modem returns a NO ANSWER code.  
Disable data calling tone transmission.  
Detect AT&T call card “bong” tone. The character should  
follow the phone number and precede the user’s call card  
number: ATDT1028806127853500$123456789  
^
$
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 y by the  
&Zy=x command. Example: ATDS=2  
Command: En  
Values:  
Echo Command Mode Characters  
n = 0 or 1  
Default:  
1
Description:  
E0  
E1  
Do not echo keyboard input to the terminal.  
Do echo keyboard input to the terminal.  
Command: Fn  
Values:  
Echo Online Data Characters  
n = 1  
Default:  
1
F0  
F1  
Enable online data character echo. (Not supported.)  
Disable online data character echo (included for  
backward compatibility with some software).  
3-2  
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AT Commands  
Command: Hn  
Values:  
Hook Control  
n = 0 or 1  
Default:  
0
Description:  
H0  
H1  
Go on-hook (hang up).  
Go off-hook (make the phone line busy).  
Command: In  
Values:  
Default:  
Information Request  
n = 0–5, 9, 11  
None  
Description:  
I0  
I1  
I2  
Display default speed and controller firmware version.  
Calculate and display ROM checksum (e.g., 12AB).  
Check ROM and verify the checksum, displaying OK  
or ERROR.  
I3  
I4  
I5  
Display default speed and controller firmware version.  
Display firmware version for data pump (e.g., 94).  
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.  
Command: Mn  
Values:  
Monitor Speaker Mode  
n = 0, 1, 2, or 3  
Default:  
1
Description:  
M0  
M1  
M2  
M3  
Speaker always off.  
Speaker on until carrier signal detected.  
Speaker always on when modem is off-hook.  
Speaker on until carrier is detected, except while dialing.  
Command: Nn  
Values:  
Modulation Handshake  
n = 0 or 1  
Default:  
1
Description:  
N0  
N1  
Modem performs handshake only at communication  
standard specified by S37 and the B command.  
Modem begins handshake at communication standard  
specified by S37 and the B command. During handshake,  
fallback to a lower speed can occur.  
Command: On  
Values:  
Return Online to Data Mode  
n = 0, 1, 3  
Default:  
None  
Description:  
O0  
Exit online command mode and return to data mode  
(see +++AT<CR> escape sequence).  
O1  
O3  
Issue a retrain and return to online data mode.  
Issue a rate renegotiations and return to data mode.  
3-3  
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MT5634 Modem; AT Command Set  
Command:  
Values:  
P
Pulse Dialing  
P, T  
Default:  
T
Description:  
Configures the modem for pulse (non-touch-tone) dialing. Dialed  
digits are pulsed until a T command or dial modifier is received.  
Command: Qn  
Values:  
Result Codes Enable/Disable  
n = 0 or 1  
Default:  
0
Description:  
Q0  
Q1  
Q2  
Enable result codes.  
Disable result codes.  
Returns an OK for backward compatibility with  
some software.  
Command: Sr=n  
Values:  
Set Register Value  
r = S-register number; n varies  
Default:  
None  
Description:  
Set value of register Sr to value of n, where n is entered in  
decimal format (e.g., S0=1).  
Command: Sr?  
Values:  
Read Register Value  
r = S-register number  
Default:  
None  
Description:  
Read value of register Sr and display it in 3-digit decimal form  
(e.g., S2? gives the response 043).  
Command:  
Values:  
T
Tone Dialing  
P, T  
Default:  
T
Description:  
Configures the modem for DTMF (touch-tone) dialing. Dialed  
digits are tone dialed until a P command or dial modifier  
is received.  
Command: Vn  
Values:  
Result Code Format  
n = 0 or 1  
Default:  
1
Description:  
V0  
V1  
Displays result codes as digits (terse response).  
Displays result codes as words (verbose response).  
3-4  
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AT Commands  
Command: Wn  
Values:  
Result Code Options  
n = 0, 1, or 2  
Default:  
2
Description:  
W0  
W1  
W2  
CONNECT result code reports serial port speed, disables  
protocol result codes.  
CONNECT result code reports serial port speed, enables  
protocol result codes.  
CONNECT result code reports line speed, enables  
protocol result codes.  
Command: Xn  
Values:  
Result Code Selection  
n = 0–7  
Default:  
4
Description:  
X0  
X1  
X2  
X3  
Basic result codes (CONNECT); does not look for dial  
tone or busy signal.  
Extended result codes (CONNECT 46000 V42bis); does  
not look for dial tone or busy signal.  
Extended result codes with NO DIALTONE; does not  
look for busy signal.  
Extended result codes with BUSY; does not look for  
dial tone.  
X4  
X5  
X6  
X7  
Extended result codes with NO DIALTONE and BUSY.  
Extended result codes with NO DIALTONE and BUSY.  
Extended result codes with NO DIALTONE and BUSY.  
Basic result codes with NO DIALTONE and BUSY.  
Command: Zn  
Values:  
Default:  
Modem Reset  
n = 0 or 1  
None  
Description:  
Z0  
Z1  
Reset modem to profile saved by the last &W command.  
Same as Z0.  
Command: &Cn  
Values:  
Data Carrier Detect (DCD) Control  
n = 0, 1, 2  
Default:  
1
Description:  
&C0 Forces the DCD circuit to be always ON.  
&C1 DCD goes ON when the remote modem’s carrier signal  
is detected, and goes OFF when the carrier signal is  
not detected.  
&C2 DCD turns OFF upon disconnect for time set by S18. It  
then goes high again (for some PBX phone systems).  
3-5  
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MT5634 Modem; AT Command Set  
Command: &Dn  
Values:  
Data Terminal Ready (DTR) Control  
n = 0, 1, 2, or 3  
Default:  
2
Description:  
&D0 Modem ignores true status of DTR signal and responds  
as if it is always on.  
&D1 If DTR drops while in online data mode, the modem  
enters command mode, issues an OK, and  
remains connected.  
&D2 If DTR drops while in online data mode, the modem  
hangs up. If the signal is not present, the modem will not  
answer or dial.  
&D3 If DTR drops, modem hangs up and resets as if ATZ  
command were issued.  
Command: &En  
Values:  
XON/XOFF Pacing Control  
n = 12 or 13  
Default:  
12  
Description:  
&E12 Disables XON/XOFF pacing.  
&E13 Enables XON/XOFF pacing.  
Command: &Fn  
Values:  
Load Factory Settings  
n = 0  
Default:  
None  
Description:  
&F0 Load factory settings as active configuration.  
Note: See also the Z command.  
Command: &Gn  
Values:  
V.22bis Guard Tone Control  
n = 0, 1, or 2  
Default:  
0
Description:  
&G0 Disable guard tone.  
&G1 Set guard tone to 550 Hz.  
&G2 Set guard tone to 1800 Hz.  
Note: The &G command is not used in North America.  
Command: &Kn  
Values:  
Flow Control Selection  
n = 0, 3, or 4  
Defaults:  
3
Description:  
&K0 Disable flow control.  
&K3 Enable CTS/RTS hardware flow control.  
&K4 Enable XON/XOFF software flow control.  
3-6  
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AT Commands  
Command: &Ln  
Values:  
Leased Line Operation  
n = 0, 1, or 2  
Defaults:  
0
Description:  
&L0 The modem is set for standard dial-up operation.  
&L1 The modem is set for leased line operation in  
originate mode.  
&L2 The modem is set for leased line operation in  
answer mode.  
Note: For &L1 and &L2, there is a 30-second window between  
power up and the starting of the leased line handshake. During  
this time, you can turn off the command, if desired.  
Command: &Pn  
Values:  
Pulse Dial Make-to-Break Ratio Selection  
n = 0, 1, or 2  
Default:  
0
Description:  
&P0 60/40 make-to-break ratio  
&P1 67/33 make-to-break ratio  
&P2 20 pulses per second  
Note: The &P2 command is available only if the country code is  
set to Japan.  
Command: &Qn  
Values:  
Asynchronous Communications Mode  
n = 0, 5, 6, 8, or 9  
Default:  
5
Description:  
&Q0 Asynchronous with data buffering. Same as \N0.  
&Q5 Error control with data buffering. Same as \N3.  
&Q6 Asynchronous with data buffering. Same as \N0.  
&Q8 MNP error control mode. If MNP error control is not  
established, the modem falls back according to the  
setting in S36.  
&Q9 V.42 or MNP error control mode. If neither error control  
is established, the modem falls back according to the  
setting in S36.  
Command: &Sn  
Values:  
Data Set Ready (DSR) Control  
n = 0 or 1  
Default:  
0
Description:  
&S0 DSR is always ON.  
&S1 DSR goes ON only during a connection.  
3-7  
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MT5634 Modem; AT Command Set  
Command: &Tn  
Values:  
Loopback Test (V.54 Test) Commands  
n = 0, 1, 3, 6  
Default:  
None  
Description:  
The modem can perform selected test and diagnostic functions. A  
test can be run only when the modem is operating in non-error-  
correction mode (normal or direct mode). For tests 3 and 6, a  
connection between the two modems must be established. To  
terminate a test in progress, the escape sequence (+++AT) must  
be entered.  
&T0 Stops any test in progress.  
&T1 Starts a local analog loopback, V.54 Loop 3, test. If a  
connection exists when this command is issued, the  
modem hangs up. When the test starts, a CONNECT  
message is displayed.  
&T3 Starts local digital loopback, V.54 Loop 2, test. If no  
connection exists, ERROR is returned.  
&T6 Initiates a remote digital loopback, V.54 Loop 2, test  
without self-test. If no connection exists, ERROR  
is returned.  
Command: &V  
Values:  
Display Current Settings  
N/A  
Description:  
Displays the active modem settings.  
Command: &Wn Store Current Configuration  
Values:  
n = 0 or 1  
Default:  
1
Description:  
&W0 Stores current modem settings in non-volatile memory  
and causes them to be loaded at power-on or following  
the ATZ command instead of the factory defaults.  
See &F command.  
&W1 Clears user default settings from non-volatile memory  
and causes the factory defaults to be loaded at power-on  
or following the ATZ command.  
Command: &Zy=x Store Dialing Command  
Values:  
y = 0–2 (0–1SMI-Parallel {internal})  
x = Dialing command  
Default:  
None  
Description:  
Stores dialing command x in memory location y. Dial the stored  
number using the command ATDS=y. See Also the #CBS  
command, a callback security command.  
3-8  
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AT Commands  
Command: \An  
Values:  
Select Maximum MNP Block Size  
n = 0, 1, 2, or 3  
Default:  
3
Description:  
\A0  
\A1  
\A2  
\A3  
64-character maximum  
128-character maximum  
192-character maximum  
256-character maximum  
Command: \Bn  
Values:  
Transmit Break  
n = 0–9 in 100 ms units  
Default:  
3
Description:  
In non-error-correction mode only, sends a break signal of the  
specified length to a remote modem. Works in conjunction with  
the \K command.  
Command: \Kn  
Values:  
Break Control  
n = 0–5  
Default:  
5
Description:  
Controls the modem’s response to a break received from:  
computer, remote modem, or \B command. Response is different  
for each of three different states.  
Data mode. Modem receives break from computer:  
\K0  
Enter online command mode, no break sent to the  
remote modem.  
\K1  
\K2  
\K3  
\K4  
\K5  
Clear data buffers and send break to the remote modem.  
Same as \K0.  
Send break immediately to the remote modem.  
Same as \K0.  
Send break to the remote modem in sequence with the  
transmitted data.  
Data mode. Modem receives break from remote modem:  
\K0  
\K1  
\K2  
\K3  
\K4  
Clear data buffers and send break to the computer.  
Same as \K0.  
Send break immediately to the computer.  
Same as \K2.  
Send break to the computer in sequence with the  
received data.  
\K5  
Same as \K4.  
Online command mode. Modem receives \Bn command from  
the computer:  
\K0  
\K1  
\K2  
\K3  
\K4  
Clear data buffers and send break to the remote modem.  
Same as \K0.  
Send break immediately to the remote modem.  
Same as \K2.  
Send break to the remote modem in sequence with the  
transmitted data.  
\K5  
Same as \K4.  
3-9  
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MT5634 Modem; AT Command Set  
Command: \Nn  
Values:  
Error Correction Mode Selection  
n = 0–5, or 7  
Default:  
3
Description:  
\N0  
Non-error correction mode with data buffering  
(buffer mode; same as &Q6).  
\N1  
\N2  
Direct mode.  
MNP reliable mode. If the modem cannot make an  
MNP connection, it disconnects.  
\N3  
V.42/MNP auto-reliable mode. The modem attempts first  
to connect in V.42 error correction mode, then in MNP  
mode, and finally in non-error correction (buffer) mode  
with continued operation.  
\N4  
V.42 reliable mode. If the modem cannot make a V.42  
connection, it disconnects.  
\N5  
\N7  
V.42, MNP, or non-error correction (same as \ N3).  
V.42, MNP, or non-error correction (same as \ N3).  
Command: \Qn  
Values:  
Flow Control Selection  
n = 0, 1, or 3  
Default:  
3
Description:  
\Q0  
\Q1  
\Q2  
\Q3  
Disable flow control (same as &K0).  
XON/XOFF software flow control (same as &K4).  
CTS-only flow control. Not supported.  
RTS/CTS hardware flow control (same as &K3).  
Command: \Tn  
Values:  
Inactivity Timer  
n = 0, 1–255  
Default:  
0
Description:  
Sets the time (in minutes) after the last character is sent or  
received that the modem waits before disconnecting. A value of  
zero disables the timer. Applies only in buffer mode.  
Note: You can also set the inactivity timer by changing the  
value of S30.  
Command: \Vn  
Values:  
Protocol Result Code  
n = 0, 1, or 2  
Default:  
1
Description:  
\V0  
\V1  
\V2  
Disables the appending of the protocol result code to  
the DCE speed.  
Enables the appending of the protocol result code to  
the DCE speed.  
Same as \V1.  
3-10  
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AT Commands  
Command: \Xn  
Values:  
XON/XOFF Pass-Through  
n = 0 or 1  
Default:  
0
Description:  
\X0  
\X1  
Modem responds to and discards XON/XOFF characters.  
Modem responds to and passes XON/XOFF characters.  
Note: This is also controlled via &E6 and &E7.  
Command: -Cn  
Values:  
Data Calling Tone  
n = 0 or 1  
Defaults:  
1
Description:  
-C0  
-C1  
Disable V.25 data calling tone to deny remote  
data/fax/voice discrimination.  
Enable V.25 data calling tone to allow remote  
data/fax/voice discrimination.  
Command: %An  
Values:  
Adaptive Answer Result Code Enable  
n = 0 or 1  
Default:  
0
Description:  
The %A command controls whether the DATA or FAX result  
codes will be sent by the modem. The modem must be in fax  
mode for this command to work. Also, the modem must be set  
to +FAA=1, which enables the modem to distinguish between  
a fax and a data call. When these commands are enabled, the  
modem sends DATA to the computer when it detects data tones  
and FAX when it detects fax tones. These strings are used by  
some servers to select the appropriate communication program.  
%A0 Disables adaptive answer result codes.  
%A1 Enables adaptive answer result codes.  
Command: %B  
Values:  
View Numbers in Blacklist  
N/A  
Description:  
If blacklisting is in effect, AT%B displays the numbers for  
which the last call attempted in the previous two hours failed.  
In countries that do not require blacklisting, the ERROR  
result code appears.  
Command: %Cn  
Values:  
Data Compression Control  
n = 0 or 1  
Default:  
1
Description:  
%C0 Disable V.42bis/MNP 5 data compression.  
%C1 Enable V.42bis/MNP 5 data compression.  
3-11  
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MT5634 Modem; AT Command Set  
Command: %DCn AT Command Control  
Values:  
n = 0 or 1  
Default:  
0
Description:  
%DC0 The modem responds to AT commands.  
%DC1 The modem ignores AT commands.  
Note: The modem will respond to AT%DC for 10 seconds  
after power-up.  
Command: %En  
Values:  
Fallback and Fall Forward Control  
n = 0, 1, or 2  
Default:  
2
Description:  
%E0 Disable fallback and fall forward.  
%E1 Enable fallback, disable fall forward.  
%E2 Enable fallback and fall forward.  
Command: %Hn Direct Connect Enable  
Values:  
n = 0, 1  
Default:  
0
Description:  
%H0 Sets callback security to normal operation.  
%H1 All callback security calls will be direct connect  
regardless of whether the password or phone number  
has the - character.  
Command: %Rn  
Values:  
Cisco Configuration  
n = 0, 1  
Default:  
0
Description:  
%R0 Disables Cisco configuration.  
%R1 Sets E0, Q1, &D0, \N0, $SB9600, and %S1 for  
operation with a Cisco router.  
Command: %Sn  
Values:  
Command Speed Response  
n = 0, 1  
Default:  
0
Description:  
%S0 Sets modem to respond to AT commands at all  
normal speeds.  
%S1 AT commands accepted at 115200 bps only.  
Commands at other speeds are ignored.  
Command: $Dn  
Values:  
Default:  
DTR Dialing  
n = 0 or 1  
0
Description:  
$D0  
$D1  
Disables DTR dialing.  
Dials the number in memory location 0 when  
DTR goes high.  
3-12  
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AT Commands  
Command: $EBn Asynchronous Word Length  
Values:  
n = 0 or 1  
Default:  
0
Description:  
$EB0 Enables 10-bit mode.  
$EB1 Enables 11-bit mode.  
Command: $MBn Online BPS Speed  
Values:  
n = speed in bits per second  
Default:  
28,800  
Description:  
$MB75  
$MB300  
Selects CCITT V.23 mode  
Selects 300 bps on-line  
Selects 1200 bps on-line  
Selects 2400 bps on-line  
Selects 4800 bps on-line  
Selects 9600 bps on-line  
Selects 14400 bps on-line  
Selects 19200 bps on-line  
Selects 28800 bps on-line  
Selects 33600 bps on-line  
$MB1200  
$MB2400  
$MB4800  
$MB9600  
$MB14400  
$MB19200  
$MB28800  
$MB33600  
Command: $RPn Ring Priority vs. AT Command Priority  
Values:  
n = 0 or 1  
Default:  
1
Description:  
$RP0 The AT command will have priority over the ring. S1 will  
be reset to 0 if an AT command is received. This  
command is storable to memory.  
$RP1 The ring will have priority over the AT command. S1 will  
increment even if an AT command and ring are received  
together and the incoming call will be answered when S1  
is equal to S0.  
Note: SocketModems do not detect ring cadence of TelTone  
telephone line simulators as a valid ring.  
Command: $SBn  
Values:  
Default:  
Serial Port Baud Rate  
n= speed in bits per second  
57600  
Description:  
$SB300  
Sets serial port to 300 bps  
Sets serial port to 1200 bps  
Sets serial port to 2400 bps  
Sets serial port to 4800 bps  
Sets serial port to 9600 bps  
Sets serial port to 19200 bps  
Sets serial port to 38400 bps  
Sets serial port to 57600 bps  
Sets serial port to 115200 bps  
Sets serial port to 230400 bps  
$SB1200  
$SB2400  
$SB4800  
$SB9600  
$SB19200  
$SB38400  
$SB57600  
$SB115200  
$SB230400  
3-13  
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MT5634 Modem; AT Command Set  
Command: +VDR=x, y  
Values:  
Distinctive Ring Report  
x = 0, 1  
Distinctive Ring report control.  
See description.  
y = 0–255 Minimum ring interval in 100 ms units.  
See description.  
Default:  
0, 0  
Description:  
Enables reporting of ring cadence information to the  
DTE and specifies the minimum ring cadence that will  
be reported. The report format is one line per silence  
period and one line per ring period. The length of the  
silence period is in the form DROF=number in units of  
100 ms<CR><LF>, and the length of the ring is in the  
form DRON=number in units of 100 ms<CR> <LF>.  
The modem may produce a Ring event code after the  
DRON message if enabled by the y parameter. The y  
parameter must be set to a value equal to or smaller than  
the expected ring cadence in order to pass the report to  
the DTE.  
+VDR=0, N/A Disables Distinctive Ring  
cadence reporting.  
+VDR=1, 0  
Enables Distinctive Ring cadence  
reporting. Other call progress result  
codes (including RING) are reported  
as normal.  
+VDR=1, >0 Enables Distinctive Ring cadence  
reporting. The RING result code is  
reported after the falling edge of the  
ring pulse (i.e., after the DRON report).  
+VDR=?  
+VDR?  
Displays the allowed values.  
Displays the current value.  
Command: #CBAn Callback Attempts  
Values:  
n = 1–255  
Default:  
4
Description:  
Sets the number of callback attempts that are allowed after  
passwords have been exchanged between modems.  
Command: #CBDn Callback Delay  
Values:  
n = 0–255  
Default:  
15  
Description:  
Sets the length of time (in seconds) that the modem waits  
before calling back the remote modem.  
3-14  
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AT Commands  
Command: #CBF? Callback Failed Attempts Display  
Values:  
N/A  
Default:  
N/A  
Description:  
Requests the number of failed callback passwords since reset  
or power-up. This number can be stored to nonvolatile memory  
using the &W command.  
Command: #CBFR Callback Failed Attempts Reset  
Values:  
N/A  
Default:  
N/A  
Description:  
Resets the number of failed callback passwords to 0. This does  
not reset the number stored in nonvolatile memory.  
Command: #CBIn Local Callback Inactivity Timer  
Values:  
n = 1–255  
Default:  
20  
Description:  
Sets the time (in minutes) that the modem waits for a command  
before forcing the user to enter the setup password again.  
Command: #CBNy=x  
Store Callback Password  
y = 0–29  
Values:  
x = password  
Defaults:  
None  
Description:  
Sets the callback security password for the y memory location.  
The password must have 6 to 10 characters, and cannot include  
the + or - ¬characters.  
Command: #CBPn Callback Parity  
Values:  
n = 0, 1, or 2  
Default:  
0
Description:  
Sets parity for the callback security messages.  
#CBP0 No parity.  
#CBP1 Odd parity.  
#CBP2 Even parity.  
Command: #CBRy Callback Security Reset  
Values:  
y = 0–29  
Default:  
None  
Description:  
Clears the password and phone number in the y memory location.  
3-15  
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MT5634 Modem; AT Command Set  
Command: #CBSn Callback Enable/Disable  
Values:  
n = 0, 1, 2, or 3  
Default:  
0
Description:  
#CBS0 Disables callback security.  
#CBS1 Enables local and remote callback security.  
#CBS2 Enables remote callback security only.  
#CBS3 Disables callback security until local hang-up or reset.  
Command: #Pn  
Values:  
Set 11-bit Parity  
n = 0 or 1  
Default:  
2
Description:  
#P0  
#P1  
#P2  
No parity.  
Odd parity.  
Even parity.  
Command: #Sx  
Values:  
Enter Setup Password  
x= password (1–8 characters, case sensitive)  
Default:  
MTSMODEM  
Description:  
Enters the remote configuration setup password.  
Command: #S=x  
Values:  
Store Setup Password  
x= password (1–8 characters, case sensitive)  
Default:  
MTSMODEM  
Description:  
Stores a new remote configuration setup password.  
3.1 Escape AT Commands  
Command: +++AT<CR> Escape Sequence  
Values:  
N/A  
Description:  
Puts the modem in command mode (and optionally  
issues a command) while remaining online. Type  
+++AT and up to six optional command characters;  
then press [Enter]. Used mostly to issue the hang-up  
command: +++ATH<CR>.  
Command: %%%ATMTSMODEM<CR>  
Remote Configuration Escape Sequence  
N/A  
Values:  
Description:  
Initiates remote configuration mode while online  
with remote modem. The remote configuration  
escape character (%) is defined in register S13.  
3-16  
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4. S-Registers  
Certain modem values, or parameters, are stored in memory locations called  
S-Registers. Use the S command to read or to alter the contents of S-Registers  
(see previous section).  
Register Unit  
Range  
Default Description  
S0  
1 ring  
0, 1–255  
1
Sets the number of rings until the modem answers.  
ATS0=0 disables auto answer completely.  
S1  
S2  
1 ring  
0–255  
0
Counts the rings that have occurred.  
decimal 0–127  
128–255  
43 (+)  
Sets ASCII code for the escape sequence character.  
Values greater than 127 disable escape.  
S3  
S4  
S5  
decimal 0–127  
decimal 0–127  
13 (^M) Sets the ASCII code for the carriage return character.  
10 (^J)  
8 (^H)  
Sets the ASCII code for the line feed character.  
decimal 0–32  
33–127  
Sets the ASCII code for the backspace character.  
Values greater than 32 disable backspace.  
S6  
S7  
seconds 2–65*  
2*  
Sets the time the modem waits after it goes off-hook  
before it begins to dial the telephone number.  
seconds 35-65*  
50*  
Sets the time the modem waits for a carrier signal  
before aborting a call. Also sets the wait for silence  
time for the @ dial modifier.  
S8  
seconds 0–65  
2
Sets the length of a pause caused by a comma  
character in a dialing command.  
S9  
decimal 0, 1–127  
37 (%)  
20  
Sets ASCII code for remote configuration escape  
character. S9=0 disables remote configuration.  
S10  
100 ms  
1 ms  
1–254  
Sets how long a carrier signal must be lost before the  
modem disconnects.  
S11  
S28  
S30  
50–150*  
95*  
1
Sets spacing and duration of dialing tones.  
0 disables, 1–255 enables V.34 modulation.  
decimal 0, 1–255  
1 minute 0, 1–255  
0
Sets the length of time that the modem waits before  
disconnecting when no data is sent or received.  
A value of zero disables the timer. See also  
the \T command  
S35  
S36  
decimal 0–1  
decimal 0–7  
1
7
0 disables, 1 enables the V.25 calling tone, which  
allows remote data/fax/voice discrimination.  
Specifies the action to take in the event of a  
negotiation failure when error control is  
selected. (See S48.)  
4-1  
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MT5634 Modem; AT Command Set  
Register Unit Range Default Description  
S37 decimal 0–19 0 Sets the maximum V.34 "upstream" speed at which  
the modem attempts to connect.  
0 = maximum speed  
1 = reserved  
2 = 1200/75 bps  
3 = 300 bps  
4 = reserved  
5 = 1200 bps  
6 = 2400 bps  
7 = 4800 bps  
8 = 7200 bps  
9 = 9600 bps  
10 = 12000 bps  
11 = 14400 bps  
12 = 16800 bps  
13 = 19200 bps  
14 = 21600 bps  
15 = 24000 bps  
16 = 26400 bps  
17 = 28800 bps  
18 = 31200 bps  
19 = 33600 bps  
S38  
decimal 0–23  
1
Sets "downstream" data rate where V.90 provides  
rates of 28,000 to 56,000 bps in increments of  
1,333 bps.  
0 = V.90 disabled  
1 = V.90 auto rate  
2 = 28,000 bps  
3 = 29,333 bps  
4 = 30,666 bps  
5 = 32,000 bps  
6 = 33,333 bps  
7 = 34,666 bps  
8 = 36,000 bps  
9 = 37,333 bps  
10 = 38,666 bps  
11 = 40,000 bps  
12 = 41,333 bps  
13 = 42,666 bps  
14 = 44,000 bps  
15 = 45,333 bps  
16 = 46,666 bps  
17 = 48,000 bps  
18 = 49,333 bps  
19 = 50,666 bps  
20 = 52,000 bps  
21 = 53,333 bps  
22 = 54,666 bps  
23 = 56,000 bps  
Upstream data rates: Upstream V.90 data rates are  
4800 to 33,600 bps in 2400 bps increments.  
S43  
decimal 0–1  
1
For testing and debugging only. Enables/disables  
V.32bis start-up auto mode operation. 0 = disable;  
1 = enable.  
4-2  
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S-Registers  
Register Unit  
Range  
Default Description  
S48  
decimal 7 or 128  
7
Enables (7) or disables (128) LAPM negotiation.  
The following table lists the S36 and S48  
configuration settings for certain types of connections.  
S48=7  
S48=128  
S36=0, 2 LAPM or hang up  
S36=1, 3 LAPM or async  
S36=4, 6 LAPM, MNP,  
or hang up  
Do not use  
Async  
MNP or hang up  
S36=5, 7 LAPM, MNP,  
or async  
MNP or async  
S89  
seconds 0, 5–255  
10  
Sets the length of time in the off-line command mode  
before the modem goes into standby mode or  
"sleep mode". A value of zero prevents standby  
mode; a value of 1–4 sets the value to 5. Standby  
mode (sleep mode or low power mode) is controlled  
by S89. It programs the number of seconds of  
inactivity before the modem will go to sleep. The  
default value is 0. A value of 0 disables standby  
mode. The modem will wake on an incoming ring  
or an AT command.  
S108  
decimal 0–3, 6, 7  
6
Selects the 56K digital loss if using the modem  
through a PBX line. The default value is -6 dB loss,  
the value used when calling from a typical POTS  
line long distance.  
0 = -0 dB digital loss, no robbed-bit signaling  
1 = -3 dB PBX digital loss  
2 = -2 dB digital loss  
3 = -3 dB digital loss  
6 = -6 dB digital loss  
7 = -0 dB digital loss with robbed-bit signaling  
4-3  
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MT5634 Modem; AT Command Set  
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5. Result Codes  
In command mode your modem can send responses called Result Codes to  
your computer. Result codes are used by communications programs and can  
also appear on your monitor.  
Terse Verbose  
Description  
0
OK  
Command executed  
1
2
CONNECT  
RING  
Modem connected to line  
Ring signal detected  
3
4
NO CARRIER  
ERROR  
Carrier signal lost or not detected  
Invalid command  
5 *  
6
7
CONNECT 1200  
NO DIALTONE  
BUSY  
Connected at 1200 bps  
No dial tone detected  
Busy signal detected  
8
9
NO ANSWER  
CONNECT 75  
No answer at remote end  
Connected at 75 bps  
10*  
11*  
12*  
13*  
14*  
18  
24*  
25*  
28  
40*  
55*  
56*  
57*  
58*  
59*  
60*  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
CONNECT 2400  
CONNECT 4800  
CONNECT 9600  
CONNECT 14400  
CONNECT 19200  
CONNECT 57600  
CONNECT 7200  
CONNECT 12000  
CONNECT 38400  
CONNECT 300  
CONNECT 21600  
CONNECT 24000  
CONNECT 26400  
CONNECT 28800  
CONNECT 31200  
CONNECT 33600  
CONNECT 32000  
CONNECT 34000  
CONNECT 36000  
CONNECT 38000  
CONNECT 40000  
CONNECT 42000  
CONNECT 44000  
CONNECT 46000  
CONNECT 48000  
CONNECT 50000  
Connected at 2400 bps  
Connected at 4800 bps  
Connected at 9600 bps  
Connected at 14400 bps  
Connected at 19200 bps  
Connected at 57600 bps  
Connected at 7200 bps  
Connected at 12000 bps  
Connected at 38400 bps  
Connected at 300 bps  
Connected at 21600 bps  
Connected at 24000 bps  
Connected at 26400 bps  
Connected at 28800 bps  
Connected at 31200 bps  
Connected at 33600 bps  
Connected at 32000 bps  
Connected at 34000 bps  
Connected at 36000 bps  
Connected at 38000 bps  
Connected at 40000 bps  
Connected at 42000 bps  
Connected at 44000 bps  
Connected at 46000 bps  
Connected at 48000 bps  
Connected at 50000 bps  
5-1  
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MT5634 Modem; AT Command Set  
Terse Verbose  
Description  
80  
81  
82  
83  
84  
86  
87  
88  
CONNECT 52000  
CONNECT 54000  
CONNECT 56000  
CONNECT 58000  
CONNECT 60000  
CONNECT 16800  
CONNECT 115200  
DELAYED  
Connected at 52000 bps  
Connected at 54000 bps  
Connected at 56000 bps  
Connected at 58000 bps  
Connected at 60000 bps  
Connected at 16800 bps  
Connected at 115200 bps  
Delay is in effect for the dialed number  
Dialed number is blacklisted  
Blacklist is full  
Connected at 230400 bps  
Connected at 28000 bps  
Connected at 29333 bps  
Connected at 30666 bps  
Connected at 33333 bps  
Connected at 34666 bps  
Connected at 37333 bps  
Connected at 38666 bps  
Connected at 41333 bps  
Connected at 42666 bps  
Connected at 45333 bps  
Connected at 46666 bps  
Connected at 49333 bps  
Connected at 50666 bps  
Connected at 53333 bps  
Connected at 54666 bps  
Connected at 25333 bps  
Connected at 26666 bps  
89  
90  
91  
BLACKLISTED  
BLACKLIST FULL  
CONNECT 230400  
CONNECT 28000  
CONNECT 29333  
CONNECT 30666  
CONNECT 33333  
CONNECT 34666  
CONNECT 37333  
CONNECT 38666  
CONNECT 41333  
CONNECT 42666  
CONNECT 45333  
CONNECT 46666  
CONNECT 49333  
CONNECT 50666  
CONNECT 53333  
CONNECT 54666  
CONNECT 25333  
CONNECT 26666  
100  
101  
102  
103  
104  
105  
106  
107  
108  
109  
110  
111  
112  
113  
114  
115  
116  
* EC is added to these result codes when the extended result codes  
configuration option is enabled. EC is replaced by one of the following  
codes, depending on the type of error control connection:  
V42bis – V.42 error control (LAP-M) and V.42bis data compression  
V42 – V.42 error control (LAP-M) only  
MNP5 – MNP 4 error control and MNP 5 data compression  
MNP4 – MNP 4 error control only  
NoEC – No error control protocol  
5-2  
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6. Remote Configuration and  
Country Code Configuration  
6.1. Remote Configuration  
Remote configuration is a network management tool that allows you to  
configure modems anywhere in your network from one location. With  
password-protected remote configuration, you can issue AT commands to a  
remote modem for maintenance or troubleshooting as if you were on-site.  
6.1.1.  
Basic Procedure  
The following steps are valid regardless of whether the connection is  
established by the local or the remote modem.  
1. Establish a data connection with a remote modem.  
2. Send three remote configuration escape characters followed by AT and  
the setup password and press [Enter].  
• Example: %%%ATMTSMODEM.  
You have four tries to enter the correct password before being  
disconnected. If the password is correct, the remote modem responds  
with OK.  
3. You can now send AT commands to configure the remote modem.  
4. When you have finished configuring the remote modem, save the new  
configuration by typing AT&W0. Press [Enter].  
5. Type ATO. Press [Enter] to exit remote configuration. You can now  
break the connection.  
6.1.2.  
Setup  
MT5634 Modems are shipped with a default setup password (MTSMODEM).  
Because anyone who has the User Guide knows the default setup password,  
you should change the password and possibly also the remote configuration  
escape character.  
6-1  
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MT5634 Modem; AT Command Set  
6.1.2.1. Changing the Setup Password  
1. Open a data communications program such as HyperTerminal.  
2. In the terminal window, type AT#SMTSMODEM (or AT#Syyyyyy if  
you have replaced the MTSMODEM password with yyyyyy) and press  
[Enter]. The modem responds with OK if the setup password is correct  
and ERROR if it is wrong.  
3. To change the password, type AT#S=yyyyyy, where yyyyyy stands for  
the password and press [Enter]. The password can include any keyboard  
character and can be up to eight characters long. The modem responds  
with OK.  
4. The new password is saved automatically. You can now either enter more  
AT commands or exit the data communications program. The next time  
you remotely configure the modem you must use the new setup password.  
Note: You can only change the setup password locally; you cannot do  
it remotely. Also, passwords are case sensitive. The next time you enter  
the password, it must be in the same case as you set it up.  
6.1.2.2. Changing the Remote Escape Character  
To further improve security, you can change a remote modem’s remote  
configuration escape character. The remote configuration escape character is  
stored in register S9. The factory default is 37, which is the ASCII code for the  
percent character (%). Setting S9 to 0 (zero) disables remote  
configuration entirely.  
Caution: If you do this remotely, you won’t be able to change it  
back remotely!  
1. Establish a remote configuration link with the remote modem as described  
in Basic Procedure.  
Note: This command can be executed locally as well as remotely.  
2. Type ATS9=n, where n is the ASCII code for the new remote  
configuration escape character and press [Enter].  
3. Save the new value by typing AT&W and pressing [Enter].  
4. Type ATO and press [Enter] to exit remote configuration.  
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Remote Configuration and Country Code Configuration  
6.2. Country Code Configuration  
Different countries have different requirements for how modems must  
function. Therefore, before you use the modem, you must configure it to match  
the defaults of the country in which you are using it.  
If you are comfortable using AT commands, you can configure your modem  
using AT commands. You must enter these commands in your communication  
program’s terminal window.  
To configure the modem for a specific country, execute the following AT  
commands:  
1. Type AT%T19,0,nn (nn stands for country code). Press [Enter]. OK is  
displayed.  
2. Then save the changes by issuing the following command:  
AT&F&W  
3. To verify that the correct country has been configured, issue the following  
command:  
ATI9  
4. The country code is then displayed in decimal format.  
The following is an example of country, AT commands, and result codes.  
AT Command  
Country  
(Hexadecimal)  
AT%T19,0,34 (default)  
AT%T19,0,01  
Result Code (Decimal)  
Euro/NAM  
Australia  
52  
1
Czech Republic  
Japan  
AT%T19,0,25  
37  
16  
9
AT%T19,0,10  
New Zealand  
AT%T19,0,9  
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MT5634 Modem; AT Command Set  
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