Cardinal AT Command Quick Reference ================================ ISSUING COMMANDS TO YOUR MODEM ============================== Your modem is always in either command mode or online mode. The modem starts up in command mode when it is turned on. Commands are only accepted by the modem in command mode. When connection to a remote system is established, your modem is in online mode. Commands entered while the modem is in on-line mode are treated as data, not as commands. Command Line Prefix ------------------- The AT prefix (also known as the ATtention Code) alerts the modem that one or more commands are to follow. The letters AT-the command line prefix-can be typed as either uppercase or lowercase characters. Both the A and T, however, must be in the same case. All commands, except two, must begin with the characters AT and end with a carriage return. The two exceptions are the escape sequence (+++) and the repeat command (A/). The carriage return character is produced when you press Enter. The modem stores your command line in a 255-character buffer. The AT prefix, the carriage return, and the linefeed characters (if any) do not go into the buffer and are not included as part of the character limitation. Spaces added between commands are not included as part of the total. If you attempt to put more than 255 characters in the buffer, an ERROR result code will be sent by the modem, and the command line will be ignored. Note: If your monitor screen displays AATT instead of AT, you may disable the command echo feature by typing in the ATE0 (zero) command. Resetting the Modem ------------------- The ATZ command resets the modem to the configuration profile stored in nonvolatile memory location 0. The ATZ1 command resets the modem to the configuration profile stored in non-volatile memory location 1. Dialing with AT Commands ------------------------ To dial the modem with AT commands, type ATDT 9 W 555-1234. This command means (AT)tention modem, (D)ial using (T)one dialing, dial a 9 to access an outside line, (W)ait for a dial tone, dial 5551234 and wait for an answer. Saving a Phone Number --------------------- To save a phone number, type AT&Z1=T9 W 555-1234. This command line causes the modem to store T9W5551234 in telephone number location 1 of nonvolatile memory. There are four locations set aside in the modem’s nonvolatile memory in which you can store frequently-dialed telephone numbers or other often- used numerical sequences. The modem transfers the number stored in the specified telephone number location to the command buffer-as if you typed it from the keyboard. The command to dial a stored number is issued in the form: Dialing a Saved a Phone Number ------------------------------ To dial a saved phone number, type ATDS=1. The above command dials the numerical sequence found in the telephone number storage location 1 of nonvolatile memory. Redialing the Last Number ------------------------- The ATDL command allows you to have the modem redial the last number called during the current session. Although the numbers or dial strings stored with the AT&Zn=x command remain in memory from one session to the next, numbers used by the ATDL command do not. Automatic Answering ------------------- The modem can be set to pick up the telephone automatically after a predetermined number of rings. To set the modem to answer the telephone after n rings, type ATS0=n. The variable n is a value between 1 and 255. You can turn off the auto answer function with the command ATS0=0. AT COMMANDS =========== A Manual Answer: goes off hook in answer mode. Pressing any key aborts the operations. A/ Re-executes the last issued command. This does not require the AT prefix or a Carriage Return. Any key Aborts off-hook dial/answer operation and hangs up. AT Required command prefix, except with A/ and +++. Use alone to test for OK result code. Bn U.S./ITU-T answer sequence. B0 ITU-T answer sequence (the default) B1 U.S. answer tone Dn Dials the specified phone number. Includes the following: L Dials the last dialed number. P Pulse (rotary) dial R Originates call using answer (reverse) frequencies. Sn Dials the phone number string stored in NVRAM at position n (n = 0 to 3). Phone numbers are stored with the &Zn=s command. T Tone dial , (Comma) Pause, See S8 definition; which it’s linked to. ; (Semicolon) Return to Command mode after dialing. " Dials the letters that follow (in an alphabetical phone number). ! (Exclamation point) Flashes the switch hook. / Delays for 125 ms. before proceeding with dial string. W Wait for second dial tone (X2 or X4); linked to S6 register. @ Dials, waits for quiet answer, and continues (X3 or higher). $ Displays a list of Dial commands. En Sets local echo. E0 Echo OFF E1 Modem displays keyboard commands (the default) Fn Sets online local echo of transmitted data ON/OFF. F0 Local echo ON. Modem sends a copy of data it sends to the remote system to your screen. F1 Local echo OFF. Receiving system may send a remote echo of data it receives. (the default) Hn Controls ON/OFF hook. H0 Hangs up (goes on hook). H1 Goes off hook. In Displays the following information. I0 Four-digit product code I1 Results of ROM checksum I2 Results of RAM checksum I3 Product type I4 Current modem settings I5 Nonvolatile memory (NVRAM) settings I6 Link diagnostics I7 Product configuration Ln Controls speaker volume (for internal models only). L0 Low volume L1 Low volume L2 Medium volume (the default) L3 High volumer Mn Operates speaker. M0 Speaker always OFF. M1 Speaker ON until CONNECT. (the default) M2 Speaker always ON. M3 Speaker ON after dial, until CONNECT. On Returns online. O0 Returns online. O1 Returns online and retrains. P Sets pulse dial (for phone lines that don’t support touch-tone dialing). Qn Displays/suppresses result codes. Q0 Displays result codes. (the default) Q1 Quiet mode; no result codes. Q2 Displays result codes only in Originate mode. Sr.b=n Sets bit .b of register r to n (0/OFF or 1/ON). Sr=n Sets register r to n. Sr? Displays contents of S-Register r. S$ Displays a list of the S-Registers. T Sets tone dial. Vn Displays verbal/numeric result codes. V0 Numeric codes V1 Verbal codes (the default) Xn Sets result code displayed. Default is X4. Xn Setting Result Codes X0 X1 X2 X3 X4 0/OK · · · · · 1/CONNECT · · · · · 2/RING · · · · · 3/NO CARRIER · · · · · 4/ERROR* · · · · · 5/CONNECT 1200 · · · · 6/NO DIAL TONE · · 7/BUSY · · 8/NO ANSWER** · · 9/Reserved 10/CONNECT 2400 · · · · 11/RINGING · 13/CONNECT 9600 · · · · 18/CONNECT 4800 · · · · 20/CONNECT 7200 · · · · 21/CONNECT 12000 · · · · 25/CONNECT 14400 · · · · 43/CONNECT 16800 · · · · 85/CONNECT 19200 · · · · 91/CONNECT 21600 · · · · 99/CONNECT 24000 · · · · 103/CONNECT 26400 · · · · 107/CONNECT 28800 · · · · 151/CONNECT 31200 · · · · 155/CONNECT 33600 · · · · · 180/CONNECT 33333 · · · · · 184/CONNECT 37333 · · · · · 188/CONNECT 41333 · · · · · 192/CONNECT 42666 · · · · · 196/CONNECT 44000 · · · · · 200/CONNECT 45333 · · · · · 204/CONNECT 46666 · · · · · 208/CONNECT 48000 · · · · · 212/CONNECT 49333 · · · · · 216/CONNECT 50666 · · · · · 220/CONNECT 52000 · · · · · 224/CONNECT 53333 · · · · · 228/CONNECT 54666 · · · · · 232/CONNECT 56000 · · · · · 236/CONNECT 57333 · · · · · Adaptive Dialing · · · Wait for 2nd Dial Tone (W) · · Wait for Answer (@) · · Fast Dial · · **Requires @ in dial string; replaces NO CARRIER Yn Selects power-on/reset default configuration. Y0 Default is profile 0 setting in NVRAM (the default) Y1 Default is profile 1 setting in NVRAM Z Resets modem. Z0 Resets modem to NVRAM profile selected by Y command or dip 7. Z1 Resets modem to NVRAM profile 0 Z2 Resets modem to NVRAM profile 1 Z3 Resets modem to factory default profile 0 (&F0) Z4 Resets modem to factory default profile 1 (&F1) Z5 Resets modem to factory default profile 2 (&F2) &A Displays a list of ampersand (&) commands. &An enables/disables additional result code subsets (see Xn). &A0 ARQ result codes disabled &A1 ARQ result codes enabled &A2 V.32 modulation indicator added &A3 Protocol indicators added* LAPM/MNP/NONE (error control) and V42 bis/MNP5 (data compression) (the default) &Bn Manages modem’s serial port rate. &B0 Variable, follows connection rate &B1 Fixed serial port rate (the default) &B2 Fixed in ARQ mode, variable in non-ARQ mode &Cn Controls Carrier Detect (CD) signal. &C0 CD override &C1 Normal CD operations (the default) &Dn Controls Data Terminal Ready (DTR) operations. &D0 DTR override (the default) &D1 DTR toggle causes online Command mode &D2 Normal DTR operations &D3 Resets on receipt of DTR &F1 Loads the factory configuration. &Gn Sets Guard Tone. &G0 No guard tone, U.S. and Canada (the default) &G1 550 Hz guard tone, some European countries, requires B0 setting. &G2 1800 Hz guard tone, U.K., requires B0 setting. &Hn Sets Transmit Data (TD) flow control (see also &Rn). &H0 Flow control disabled &H1 Hardware flow control, Clear to Send (CTS) (the default) &H2 Software flow control, XON/XOFF &H3 Hardware and software flow control &In Sets Receive Data (RD) software flow control (see also &Rn). &I0 Software flow control disabled (the default) &I1 XON/XOFF signals to your modem and remote system &I2 XON/XOFF signals to your modem only &Kn Enables/disables data compression. &K0 Data compression disabled &K1 Auto enable/disable (the default) &K2 Data compression enabled &K3 MNP5 compression disabled &Mn Sets Error Control (ARQ) for connections at 1200 bps and higher. &M0 Normal mode, error control disabled &M1 Reserved &M2 Reserved &M3 Reserved &M4 Normal/ARQ (the default) &M5 ARQ mode &Nn Sets connect speed. If connection cannot be established at this speed, the modem will hang up. Sets ceiling connect speed if &Un is greater than 0. See &Un. &N0 Variable rate (the default) &N1 300 bps &N2 1200 bps &N3 2400 bps &N4 4800 bps &N5 7200 bps &N6 9600 bps &N7 12,000 bps &N8 14,400 bps &N9 16,800 bps &N10 19,200 bps &N11 21,600 bps &N12 24,000 bps &N13 26,400 bps &N14 28,800 bps &N15 31,200 bps &N16 33,600 bps &N17 33,333 bps &N18 37,333 bps &N19 41,333 bps &N20 42,666 bps &N21 44,000 bps &N22 45,333 bps &N23 46,666 bps &N24 48,000 bps &N25 49,333 bps &N26 50,666 bps &N27 52,000 bps &N28 53,333 bps &N29 54,666 bps &N30 56,000 bps &N31 57,333 bps &Pn Sets pulse (rotary) dial make/break ratio. &P0 U.S./Canada ratio, 39%/61% (the default) &P1 U.K. ratio, 33%/67% &Rn Sets Receive Data (RD) hardware flow control, Request to Send (RTS) (see also &Hn). &R0 Reserved &R1 Modem ignores RTS &R2 Received Data to computer only on RTS (the default) &Sn Controls Data Set Ready (DSR) operations. &S0 DSR override; always ON (the default) &S1 Modem controls DSR &Tn Begins test modes. &T0 Ends testing &T1 Analog Loopback &T2 Reserved &T3 Local Digital Loopback &T4 Enables Remote Digital Loopback &T5 Prohibits Remote Digital Loopback (the default) &T6 Initiates Remote Digital Loopback &T7 Remote Digital with self-test and error detector &T8 Analog Loopback with self-test and error detector &Un Sets floor connect speed when &Un is set greater than 0. &Nn is the ceiling connect speed. See &Nn. &U0 Disabled (the default) &U1 300 bps &U2 1200 bps &U3 2400 bps &U4 4800 bps &U5 7200 bps &U6 9600 bps &U7 12,000 bps &U8 14,400 bps &U9 16,800 bps &U10 19,200 bps &U11 21,600 bps &U12 24,000 bps &U13 26,400 bps &U14 28,800 bps &U15 31,200 bps &U16 33,600 bps &U17 33,333 bps &U18 37,333 bps &U19 41,333 bps &U20 42,666 bps &U21 44,000 bps &U22 45,333 bps &U23 46,666 bps &U24 48,000 bps &U25 49,333 bps &U26 50,666 bps &U27 52,000 bps &U28 53,333 bps &U29 54,666 bps &U30 56,000 bps &U31 57,333 bps &Wn Writes current configuration to NVRAM templates. &W0 Modifies the NVRAM 0 template (Y0) &W1 Modifies the NVRAM 1 template (Y1) &Yn Sets break handling. &Y0 Destructive, but doesn’t send break &Y1 Destructive, expedited (the default) &Y2 Nondestructive, expedited &Zn=s Writes phone number string s to NVRAM at position n (n = 0-3). &Zn=L Writes last executed dial string to NVRAM at position n (n = 0-3). &Zn? Displays the phone number stored at position n (n = 0-3). &ZL? Displays the last executed dial string. +++ Escapes to online-command mode. S Registers To change a setting, use the ATSr=n command, where r is the register and n is a decimal value from 0-255 (unless otherwise indicated). Register Default Function S0 0 Sets the number of rings on which to answer in Auto Answer Mode. When set to 0, Auto Answer is disabled. S1 0 Counts and stores the number of rings from an incoming call. (S0 must be greater than 0.) S2 43 Stores the ASCII decimal code for the escape code character. Default character is +. A value of 128-255 disables the escape code. S3 13 Stores the ASCII code for the Carriage Return character. Valid range is 0-127. S4 10 Stores the ASCII decimal code for the Line Feed character. Valid range is 0 - 127. S5 8 Stores the ASCII decimal code for the Backspace character. A value of 128-255 disables the Backspace key’s delete function. S6 2 Sets the number of seconds the modem waits before dialing. If Xn is set to X2 or X4, this is the time-out length if there isn’t a dial tone. S7 60 Sets the number of seconds the modem waits for a carrier. May be set for much longer duration if, for example, the modem is originating an international connection. S8 2 Sets the duration, in seconds, for the pause (,) option in the Dial command. S9 6 Sets the required duration, in tenths of a second, of the remote modem’s carrier signal before recognition by the modem. S10 14 Sets the duration, in tenths of a second, that the modem waits to hang up after loss of carrier. This guard time allows the modem to distinguish between a line disturbance from a true disconnect (hang up) by the remote modem. While we don’t recommend connecting the modem to a line with call waiting, if you have it, you may wish to adjust this setting upward to prevent the modem from misinterpreting the second call signal as a disconnect by the remote modem. A better alternative is to ask your phone company how to temporarily disable call waiting (usually *70W). For example: ATDT *70W phone number. Note: If you set S10 = 255, the modem will not hang up when carrier is lost. Dropping DTR hangs up the modem. S11 70 Sets the duration and spacing, in milliseconds, for tone dialing. S12 50 Sets the duration, in fiftieths of a second, of the guard time for the escape code sequence (+++). S13 0 Bit-mapped register. Select the bit(s) you want on and set S13 to the total of the values in the Value column. For example, ATS13 = 17 enables bit 0 (value is 1) and bit 4 (value is 16). Bit Value Result 0 1 Reset when DTR drops. 1 2 Reset non-MNP transmit buffer from 1.5K to 128 bytes.* 2 4 Set backspace key to delete. 3 8 On DTR signal, auto dial the number stored in NVRAM at position 0. 4 16 At power on/reset, Auto Dial the number stored in NVRAM at position 0. 5 32 Reserved 6 64 Reserved 7 128 Disconnect on escape code. The 1.5K-byte non-ARQ buffer allows data transfer with Xmodem- and Ymodem-type file transfer protocols without using flow control. The 128-byte option lets remote users with slower modems keep data you’re sending from scrolling off their screens. When remote users send your computer an XOFF (Ctrl-S) and you stop transmitting, the data in transit from your modem’s buffer doesn’t exceed the size of their screen. S14 0 Reserved S15 0 Bit-mapped register setup. To set the register, see instructions for S13. Bit Value Result 0 1 Disable ARQ/MNP for V.22. 1 2 Disable ARQ/MNP for V.22bis. 2 4 Disable ARQ/MNP V.32/V.32bis/V.32terbo. 3 8 Disable MNP handshake. 4 16 Disable MNP level 4. 5 32 Disable MNP level 3. 6 64 MNP incompatibility. 7 128 Disable V.42 operation. 136 Disable V.42 detect phase.(The sum of the values of bits 3 and 7.) S16 - S17 Reserved S18 0 Test timer for &T loopback testing. Sets the time in seconds of testing before the modem automatically times out and terminates the test. When set to 0, the timer is disabled. Valid range is 1-255. S19 0 Sets the duration, in minutes, for the inactivity timer. The timer activates when there is no data activity on the phone line; at time-out the modem hangs up. S19 = 0 disables the timer. S20 0 Reserved S21 10 Sets the length, in 10-millisecond units, of breaks sent from the modem to the computer; applies to MNP or V.42 mode only. S22 17 Stores the ASCII decimal code for the XON character. S23 19 Stores the ASCII decimal code for the XOFF character. S24 0 Reserved S25 20 Sets the duration, in hundredths of a second, that DTR must be dropped so that the modem doesn’t interpret a random glitch as a DTR loss (Most users will want to use the default; this register is useful for setting compatibility with older systems running under older operating software.) S26 0 Reserved S27 0 Bit-mapped register setup. To set the register, see instructions for S13. Bit Value Result 0 1 Enables ITU-T V.21 modulation at 300 bps for overseas calls; in V.21 mode, the modem answers both overseas and domestic (U.S. and Canada) calls, but only originates V.21 calls (Default Bell 103) 1 2 Enables unencoded (non-trellis coded) modulation in V.32 mode. 2 4 Disables V.32 modulation. 3 8 Disables 2100 Hz answer tone to allow two V.42 modems to connect faster. 4 16 Enables V.23 fallback mode. 5 32 Disables V.32bis mode. 6 64 Disables v.42 selective reject. 7 128 Software compatibility mode. This setting disables the codes and displays the 9600 code instead. The actual rate of the call can be viewed on the ATI6 screen. Used for unusual software incompatibilities. Some software may not accept 7200, 12,000, and 14,400 bps or greater result codes. S28 0 Eliminates the V.32 answer tones for a faster connection. 8 Default item, all times are in tenths of seconds. 255 Disables all connections except V.32 at 9600 bps. S29 20 Sets the duration, in tenths of a second, of the V.21 answer mode fallback timer. S30 - S31 Reserved S32 2 Bit mapped register setup. To set the register, see the instructions for S13. Bit Value Result 0 1 V.8 Call Indicate enabled. 1 2 Enables V.8 mode. 2 4 Reserved. 3 8 Disable V.34 modulation. 4 16 Disable V.34+ modulation. 5 32 Disable x2 modulation 6 64 Reserved. 7 128 Reserved. S33 0 Bit mapped register setup. To set the register, see the instructions for S13. Bit Value Result 0 1 Disable 2400 symbol rate. 1 2 Disable 2743 symbol rate. 2 4 Disable 2800 symbol rate. 3 8 Disable 3000 symbol rate. 4 16 Disable 3200 symbol rate. 5 32 Disable 3429 symbol rate. 6 64 Reserved. 7 128 Disable shaping. S34 0 Bit mapped register setup. To set registers, see instructions for S13. Bit Value Result 0 1 Disable 8S-2D trellis encoding. 1 2 Disable 16S-4D trellis encoding. 2 4 Disable 32S-2D trellis encoding. 3 8 Disable 64S-4D trellis encoding. 4 16 Disable non-linear coding. 5 32 Disable TX level deviation. 6 64 Disable Pre-emphasis. 7 128 Disable Pre-coding. S35-S37 Reserved S38 0 Sets an optional delay, in seconds, before a forced hang-up and clearing of the Transmit buffer when DTR drops during an ARQ call. This allows time for a remote modem to acknowledge receipt of all transmitted data before it is disconnected. The modem immediately hangs up when DTR drops. This option only applies to connections terminated by dropping DTR. If the modem receives the ATH command, it ignores S38 and immediately hangs up. S39-S40 ReservedDownload Driver Pack
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