WTI Part No. 13513 Rev.
Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 2. AT Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 3. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.1 Escape AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MT5634 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.
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.
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).
MT5634 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 Leng
3. AT Commands Command: AT Attention Code Values: Description: N/A The attention code precedes all command lines except A/, A: and escape sequences. Command: [Enter] Key Command: A Answer Command: A/ Repeat Last Command Command: Bn Communication Standard Setting Values: Description: Values: Description: Values: Description: Values: Default: Description: N/A Press the [Enter] (RETURN) key to execute most commands. N/A Answer call before final ring. N/A Repeat the last command string.
MT5634 Modem; AT Command Set Command: Ds Dial Command: DS=y Dial Stored Telephone Number Command: En Echo Command Mode Characters Command: Fn Echo Online Data Characters Values: Default: Description: Values: Default: Description: Values: Default: Description: Values: Default: 3-2 s = dial string (phone number and dial modifiers) none 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 (
AT Commands Command: Hn Hook Control Command: In Information Request Command: Mn Monitor Speaker Mode Command: Nn Modulation Handshake Command: On Return Online to Data Mode Values: Default: Description: Values: Default: Description: Values: Default: Description: Values: Default: Description: Values: Default: Description: n = 0 or 1 0 H0 Go on-hook (hang up). H1 Go off-hook (make the phone line busy). n = 0–5, 9, 11 None I0 Display default speed and controller firmware version.
MT5634 Modem; AT Command Set Command: P Pulse Dialing Values: Default: Description: P, T T Configures the modem for pulse (non-touch-tone) dialing. Dialed digits are pulsed until a T command or dial modifier is received. Command: Qn Result Codes Enable/Disable Command: Sr=n Set Register Value Command: Sr? Read Register Value Values: Default: Description: Values: Default: Description: Values: Default: Description: Command: T n = 0 or 1 0 Q0 Enable result codes. Q1 Disable result codes.
AT Commands Command: Wn Result Code Options Command: Xn Result Code Selection Command: Zn Modem Reset Command: &Cn Data Carrier Detect (DCD) Control Values: Default: Description: Values: Default: Description: Values: Default: Description: Values: Default: Description: n = 0, 1, or 2 2 W0 CONNECT result code reports serial port speed, disables protocol result codes. W1 CONNECT result code reports serial port speed, enables protocol result codes.
MT5634 Modem; AT Command Set Command: &Dn Data Terminal Ready (DTR) Control Command: &En XON/XOFF Pacing Control Command: &Fn Load Factory Settings Values: Default: Description: Values: Default: Description: Values: Default: Description: n = 0, 1, 2, or 3 2 &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.
AT Commands Command: &Ln Leased Line Operation Command: &Pn Pulse Dial Make-to-Break Ratio Selection Command: &Qn Asynchronous Communications Mode Command: &Sn Data Set Ready (DSR) Control Values: Defaults: Description: Values: Default: Description: Values: Default: Description: Values: Default: Description: n = 0, 1, or 2 0 &L0 The modem is set for standard dial-up operation. &L1 The modem is set for leased line operation in originate mode.
MT5634 Modem; AT Command Set Command: &Tn Loopback Test (V.54 Test) Commands Command: &V Display Current Settings Command: &Wn Store Current Configuration Values: Default: Description: Values: Description: Values: Default: Description: n = 0, 1, 3, 6 None The modem can perform selected test and diagnostic functions. A test can be run only when the modem is operating in non-errorcorrection mode (normal or direct mode). For tests 3 and 6, a connection between the two modems must be established.
AT Commands Command: \An Values: Default: Description: Command: \Bn Values: Default: Description: Command: \Kn Values: Default: Description: Select Maximum MNP Block Size n = 0, 1, 2, or 3 3 \A0 64-character maximum \A1 128-character maximum \A2 192-character maximum \A3 256-character maximum Transmit Break n = 0–9 in 100 ms units 3 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.
MT5634 Modem; AT Command Set Command: \Nn Values: Default: Description: Command: \Qn Values: Default: Description: Command: \Tn Error Correction Mode Selection n = 0–5, or 7 3 \N0 Non-error correction mode with data buffering (buffer mode; same as &Q6). \N1 Direct mode. \N2 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.
AT Commands Command: \Xn Values: Default: Description: XON/XOFF Pass-Through n = 0 or 1 0 \X0 Modem responds to and discards XON/XOFF characters. \X1 Modem responds to and passes XON/XOFF characters. Note: This is also controlled via &E6 and &E7.
MT5634 Modem; AT Command Set Command: %DCn AT Command Control Values: Default: Description: n = 0 or 1 0 %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.
AT Commands Command: $EBn Asynchronous Word Length Command: $MBn Online BPS Speed Command: $RPn Ring Priority vs. AT Command Priority Command: $SBn Serial Port Baud Rate Values: Default: Description: Values: Default: Description: Values: Default: Description: Values: Default: Description: n = 0 or 1 0 $EB0 Enables 10-bit mode. $EB1 Enables 11-bit mode. n = speed in bits per second 28,800 $MB75 Selects CCITT V.
MT5634 Modem; AT Command Set Command: +VDR=x, y Values: Default: Description: Distinctive Ring Report x = 0, 1 Distinctive Ring report control. See description. y = 0–255 Minimum ring interval in 100 ms units. See description. 0, 0 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.
AT Commands Command: #CBF? Callback Failed Attempts Display Values: Default: Description: N/A N/A 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: Default: Description: N/A N/A Resets the number of failed callback passwords to 0. This does not reset the number stored in nonvolatile memory.
MT5634 Modem; AT Command Set Command: #CBSn Callback Enable/Disable Values: Default: Description: n = 0, 1, 2, or 3 0 #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.
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 1 ring 0–255 0 Counts the rings that have occurred. S2 decimal 0–127 128–255 43 (+) Sets ASCII code for the escape sequence character.
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.
S-Registers Register Unit Range Default Description S48 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.
MT5634 Modem; AT Command Set 4-4
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.
MT5634 Modem; AT Command Set Terse Verbose Description 80 81 82 83 84 86 87 88 89 90 91 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 CONNECT 52000 CONNECT 54000 CONNECT 56000 CONNECT 58000 CONNECT 60000 CONNECT 16800 CONNECT 115200 DELAYED 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 CONNEC
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.
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].
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.
MT5634 Modem; AT Command Set 6-4
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