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US Robotics Mobile Communications Customer Support ============================================================================= AT Command Set Reference Document Title : Rockwell V.32/V.32bis AT Command Set Reference Revision Date : 27 Dec 95 See Also : Technical Bulletin 3008 Product Scope : XJ3144, CC6144, XJ2144, XJ1144, CC3144, CC4144, XJEM1144, CCEM1144, EM1144, XJ196FM, CC396FM, XJ124FM, CC324FM, P2144 (9V), P296FMV (9V), A2144, AR196FM ----------------------------------------------------------------------------- 1.0 Basic AT Commands 2.0 AT& Commands 3.0 AT% Commands 4.0 AT\ Commands 5.0 Error Detection And Data Compression Commands 6.0 MNP 10 Commands 7.0 W-Class Commands 8.0 S Register Summary 9.0 XJ3144 and CC6144 Commands 10.0 S Register Definitions 1.0 Basic AT Commands ============================================================================= The modem will respond to the commands detailed below. Parameters applicable to each command are listed with the command description. The defaults shown for each configuration are those used in the Rockwell stored profile 0. A/ Repeat Last Command The modem behaves as though the last command line had been re-sent by the DTE. "A/" will repeat all the commands in the command buffer. The principle application of this command is to place another call (using the Dial command) that failed to connect due to a busy line or no answer. This command must appear alone on a command line and must be terminated by the "/" character. This command should not be terminated by a carriage return. A Answer The modem will go off-hook and attempt to answer an incoming call if correct conditions are met. Upon successful completion of answer handshake, the modem will go on-line in answer mode. This command may be affected by the state of Line Current Sense, if enabled (Most countries do not require Line Current Sense). Operation is also dependent upon +FCLASS command and country specific requirements. If +FCLASS=0 is selected, the modem will enter the connect state after exchanging carrier with the remote modem. If no carrier is detected within a period specified in register S7, the modem hangs up. Any character entered during the connect sequence will abort the connection attempt. If +FCLASS=1 or 2 is selected, the modem will go off-hook in V.21 answer mode. It will generate the V.21 2100 Hz answer tone for 3 ▒ 0.5 seconds and, following a delay of 70 mS, will proceed as if the +FTH=3 command were issued. At any stage up to (but excluding) the +FTH=3 command state, any character will abort the communication. (See the description of the +FTH command for details) Bn CCITT or Bell Modulation When the modem is configured to allow either option, the modem will select Bell or CCITT modulation for a line speed connection of 300 or 1200 bps according to the parameter supplied. Any other line speed will use a CCITT modulation standard. The parameter value, if valid, is written to S27 bit 6 (Also, see ATFn command). B0 Selects CCITT operation at 300 or 1200 bps during Call Establishment and a subsequent connection. (default for W-class models) B1 Selects BELL operation at 300 or 1200 bps during Call Establishment and a subsequent connection. (default for US models) Dn Dial This command directs the modem to go on-line, dial according to the string entered and attempt to establish a connection. If no dial string is supplied, the modem will go on-line and attempt handshake in originate mode. In W-class models, the action of going off-hook is affected by the status of the Line Current Sense input, if the line current sensing is enabled, and by the blacklist and delayed list. NOTE: If the ATD command is issued before the S1 register has cleared, the modem will respond with the NO CONNECT result code. If +FCLASS=0 is selected, the modem will behave as a data modem and will attempt to connect to another data modem. The modem will have up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake. If this time expires before the modem can complete the handshake, the modem will go on-hook with the NO CARRIER response. This command will be aborted in progress upon receipt of any DTE character before completion of the handshake. If +FCLASS=1 or 2 is selected, the modem will behave as a facsimile modem and attempt to connect to a facsimile machine (or modem) by entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been issued). This command will be aborted upon receipt of any DTE character if the modem has not finished dialing. In this case, the modem will go on-hook and return to command mode after displaying the NO CARRIER message. If the modem has finished dialing, it proceeds as if the +FRH=3 command has been issued (Refer to the +FRH command to determine how the modem behaves following this stage). The valid dial string parameters are described below. Punctuation characters may be used for clarity, with parentheses, hyphen, and spaces being ignored. 0-9 DTMF digits 0 to 9. * The "star" digit (tone dialing only). # The "gate" digit (tone dialing only). A-D DTMF digits A, B, C, and D. J Perform MNP 10 link negotiation at the highest supported speed for this call only. K Enable power level adjustment during MNP 10 link negotiation for this call only. L Re-dial last number: The modem will re-dial the last valid telephone number. This command must be immediately after the "D" with all the following characters ignored. P Select pulse dialing: Pulse dial the numbers that follow until a "T" is encountered. Affects current and subsequent dialing. T Select tone dialing: Tone dial the numbers that follow until a "P" is encountered. Affects current and subsequent dialing. R This command will cause the modem to wait 10 seconds after dialing then go into answer mode. This command must be placed at the end of the dial string. S=n Dial the number stored in the directory (n = 0 to 19). (See &Z) ! Flash. The modem will go on-hook for a time defined by the value of S29. W Wait for dial tone: The modem will wait for a dial tone before dialing the digits following "W". If no dial tone is detected within the time specified by S6, the modem will abort the rest of the sequence, return on-hook, and generate an error message. @ Wait for silence: The modem will wait for at least 5 seconds of silence in the call progress frequency band before continuing with the next dial string parameter. If the modem does not detect these 5 seconds of silence before the expiration of the call abort timer (S7), the modem will terminate the call attempt with a NO ANSWER message. If busy detection is enabled, the modem may terminate the call with the BUSY result code. If answer tone arrives during execution of this parameter, the modem handshakes. , Dial pause: The modem will pause for a time specified by S8 before dialing the digits following ",". ; Return to command state: Added to the end of a dial string, this causes the modem to return to the command state after it processes the portion of the dial string preceding the ";". This allows the user to issue additional AT commands while remaining off-hook. The additional AT commands may be placed in the original command line following the";" and/or may be entered on subsequent command lines. The modem will enter call progress only after an additional dial command is issued without the ";" terminator. Use "H" to abort the dial in progress, and go back on-hook. ^ Enable calling tone: Applicable to current dial attempt only. The calling tone is a 1800 Hz tone every 3-4 seconds that alerts recipient of automatic calling equipment (as defined in CCITT V.25). > If enabled by country specific parameter, the modem will generate a grounding pulse on the EARTH relay output. En Command Echo The modem enables or disables the echo of characters to the DTE according to the parameter supplied. The parameter value, if valid, is written to S14 bit 1. E0 Disables command echo. E1 Enables command echo. Default. Fn Select Line Modulation This command selects the line modulation according to the parameter supplied. The line modulation is fixed unless automode is selected. This command interacts with the S37 and the "N" command. The parameter value, if valid, is written to S37 bit 0-3. To select line modulation, it is recommended that either the "F" command, or a combination of the S37 and the "N" command, be used, but not both. F0 Selects auto-detect mode. Sets N1 and sets S31 bit 1. In this mode, the modem configures for auto mode operation. All connect speeds are possible according the remote modem's preference. The contents of S37 are ignored as is the sensed DTE speed. Default F1 Selects V.21 or Bell 103 according to the "B" setting as the only acceptable line speed resulting in a subsequent connection. Sets N0, sets S37 to 1, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=1. F2 Not supported (other products use this setting for 600 bps). F3 Selects V.23 as the only acceptable line modulation for a subsequent connection. Originator is at 75 bps and answerer is at 1200 bps. Sets N0, sets S37 to 7, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=7. F4 Selects V.22 1200 bps or Bell 212A according to the "B" command setting as the only acceptable line speed for a subsequent connection. Sets N0, sets S37 to 5, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=5. F5 Selects V.22bis as the only acceptable line modulation for a subsequent connection. Sets N0, sets S37 to 6, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=6. F6 Select V.32bis 4800 bps or V.32 4800 bps as the only acceptable line modulation for a subsequent connection. Sets N0, sets S37 to 8, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=8. F7 Selects V.32bis 7200 bps as the only acceptable line modulation for a subsequent connection. Sets N0, sets S37 to 12, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=12. F8 Selects V.32bis 9600 bps or V.32 9600 bps as the only acceptable line modulation for a subsequent connection. Sets N0, sets S37 to 9, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=9. F9 Selects V.32bis 12000 bps as the only acceptable line modulation for a subsequent connection. Sets N0, sets S37 to 10, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=10. F10 Selects V.32bis 14400 bps as the only acceptable line modulation for a subsequent connection. Sets N0, sets S37 to 11, and clears S31 bit 1. This command is equivalent to the command string: ATN0S37=11. Hn Disconnect (Hangup) This command initiates a hang up sequence. This command may not be available for some countries due to PTT restrictions. H0 The modem will release the line if the modem is currently on-line, and will terminate any test (AT&T) that is in progress. Country specific, modulation specific, and error correction protocol specific (S38) processing is handled outside of the H0 command. H1 If on-hook, the modem will go off-hook and enter command mode. The modem will return on-hook after a period of time determined by S7. In Identification The modem reports to the DTE the requested result according to the command parameter. I0 Reports product code. I1 Reports pre-computed checksum from ROM. I2 The modem will respond OK. I3 Reports firmware revision. I4 Reports modem identifier string. Mfr=MEGAHERTZ CmdSet=MHZR Mod=V.32bis Fax=1, 2 ErrC=V.42bis, MNP5, MNP10 I5 Reports Country Code parameter (e.g., "022"). I6 Reports modem data pump model and internal code revision Ln Speaker Volume The modem sets the speaker volume control according to the parameter supplied. The parameter value, if valid, is written to S22 bits 0 and 1. L0 Low speaker volume (Not supported defaults to medium). L1 Low speaker volume (Not supported defaults to medium). L2 Medium speaker volume Default. L3 High speaker volume (Not supported defaults to medium). Mn Speaker Control This command selects when the speaker will be on or off. The parameter value, if valid, is written to S22 bits 2 and 3. M0 Speaker is always off. M1 Speaker is on during call establishment, but off when receiving carrier. Default M2 Speaker is always on. M3 Speaker is off when receiving carrier and during dialing, but on during answering. Nn Automode Enable This command enables or disables automode detection. The parameter value, if valid, is written to S31 bit 1. N0 Automode detection is disabled. A subsequent handshake will be conducted according to the contents of S37 or, if S37 is 0, according to the most recently sensed DTE speed. N1 Automode detection is enabled. A subsequent handshake will be conducted according to the automode algorithm supported by the modem. This command is equivalent to F0. Default On Return to On-Line Data Mode: This command determines how the modem will enter the on-line data mode. If the modem is in the on-line command mode, it enters the on-line data mode with or without a retrain. If the modem is in the off-line command mode (no connection), ERROR is reported. O0 Enters on-line data mode without a retrain. Handling Is determined by the Call Establishment task. Generally, if a connection exists, this command connects the DTE back to the remote modem after an escape (+++). O1 Enters on-line data mode with a retrain before returning to on-line data mode. P Set Pulse Dial Default This command forces pulse dialing until the next "T" dial modifier or "T" command is received. Sets S14 bit 5. As soon as a dial command is executed which explicitly specifies the dialing mode for that particular call (e.g., ATDT...), this command is overridden so that all future dialing will be tone dialed. Qn Quiet Results Codes Control This command enables or disables the sending of result codes to the DTE according to the parameter supplied. The parameter value, if valid, is written to S14 bit 2. Q0 Enables result codes to the DTE. Default. Q1 Disables result codes to the DTE. Sn Read/Write S Registers: The modem selects an S Register, performs an S Register read or write function, or reports the value of an S Register. n=v Sets S Register "n" to the value "v". n? Reports the value of S Register "n". The parameter "n" can be omitted, in which case S0 will be assumed. The "S" can be omitted in which case the last S Register accessed (default register) will be assumed. T Set Tone Dial Default This command forces DTMF dialing until the next "P" dial modifier or "P" command is received. The modem will set an S Register bit to indicate that all subsequent dialing should be conducted in tone mode. Note that the "DP" command will override this command. Clears S14 bit 5. This command may not be permitted in some countries. Vn Result Code Form This command selects the sending of short-form or long-form result codes to the DTE. The parameter, if valid, is written to S14 bit 3. V0 Enables short-form (terse) result codes. Line feed is not issued before a short-form result code. V1 Enables long-form (verbose) result codes. Default Wn Error Correction Message Control This command controls the format of CONNECT messages. The parameter value, if valid, is written to S31 bits 2 and 3. (Also, see S95 description) W0 Upon connection, the modem reports only the DTE speed (e.g, CONNECT 9600). Subsequent responses are disabled. Default W1 Upon connection, the modem reports the line speed, the error correction protocol, and the DTE speed, respectively. Subsequent responses are disabled. W2 Upon connection, the modem reports the DCE speed (e.g, CONNECT 2400). Subsequent responses are disabled. Xn Extended Result Codes This command selects which subset of the result messages will be used by the modem to inform the DTE of the results of commands. Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial tone detection, a "W" can be placed in the dial string (see "D" command). Table VI indicates the messages which are enabled for each "X" value. If the modem is in facsimile mode (+FCLASS=1 or 2), the only message sent to indicate a connection is CONNECT without a speed indication. X0 Disables monitoring of busy tones unless forced by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, and NO ANSWER result codes. Blind dialing is enabled/disabled by country parameters. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported. If dial tone detection is enforced or selected and dial tone is not detected, NO CARRIER will be reported instead of NO DIAL TONE. The value 000b is written to S22 bits 6, 5, and 4, respectively. X1 Disables monitoring of busy tones unless forced by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX (XXXX = rate). Blind dialing is enabled/ disabled by country parameters. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is enforced or selected and dial tone is not detected, NO CARRIER will be reported instead of NO DIAL TONE. The value 100b is written to S22 bits 6, 5, and 4, respectively. X2 Disables monitoring of busy tones unless forced by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIAL TONE, NO ANSWER, and CONNECT XXXX. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is enforced or selected and dial tone is not detected, NO DIAL TONE will be reported instead of NO CARRIER. The value 101b is written to S22 bits 6, 5, and 4, respectively. X3 Enables monitoring of busy tones; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, CONNECT XXXX and BUSY. Blind dialing is enabled/disabled by country parameters. If dial tone detection is enforced and dial tone is not detected, NO CARRIER will be reported. The value 110b is written to S22 bits 6, 5, and 4, respectively. X4 Enables monitoring of busy tones; send all messages. The value 111b is written to S22 bits 6, 5, and 4, respectively. Default TABLE VI. AT Command Result Codes NOTE: In the chart below, the "*" indicates which Xn command is supported. A numeral indicates which result code will display in place of that message. For example, the "BUSY" message (result code 7) will be returned when an ATX3DT<number> or an ATX4DT<number> is issued, but a "NO CARRIER" (result code 3) will be returned when ATX1DT<number> or ATX2DT<number> is issued. Furthermore, no result at all is returned when an ATX0DT is issued. Short Long n Value in ATXn Command 0 1 2 3 4 ----- ---------------------- ----------------------- 0 OK * * * * * 1 CONNECT * * * * * 2 RING * * * * * 3 NO CARRIER * * * * * 4 ERROR * * * * * 5 CONNECT 1200 1 * * * * 6 NO DIALTONE * 7 BUSY 3 3 * * 8 NO ANSWER * * * * * 9 CONNECT 0600 1 * * * * 10 CONNECT 2400 1 * * * * 11 CONNECT 4800 1 * * * * 12 CONNECT 9600 1 * * * * 13 CONNECT 7200 1 * * * * 14 CONNECT 12000 1 * * * * 15 CONNECT 14400 1 * * * * 16 CONNECT 19200 1 * * * * 17 CONNECT 38400 1 * * * * 18 CONNECT 57600 1 * * * * 22 CONNECT 1200TX/75RX 1 * * * * 23 CONNECT 75TX/1200RX 1 * * * * 24 DELAYED 4 4 4 4 * 32 BLACKLISTED * 35 DATA * * * * * 40 CARRIER 300 * 44 CARRIER 1200/75 * 45 CARRIER 75/1200 * 46 CARRIER 1200 * 47 CARRIER 2400 * 48 CARRIER 4800 * 49 CARRIER 7200 * 50 CARRIER 9600 * 51 CARRIER 12000 * 52 CARRIER 14400 * 66 COMPRESSION: CLASS 5 * 67 COMPRESSION: V.42bis * 69 COMPRESSION: NONE * 76 PROTOCOL: NONE * 77 PROTOCOL: LAPM * 80 PROTOCOL: ALT * 81 PROTOCOL: ALT-CELLULAR * 33 FAX * * * * * Yn Long Space Disconnect This command enables/disables the generation and response to long space (a break signal greater than 1.6 seconds)disconnect. The parameter value, if valid, is written to S21 bit 7. Y0 Disables long space disconnect. Default Y1 Enables long space disconnect. In non-error correction mode, the modem will send a long space of four seconds prior to going on-hook. In error correction mode, the modem will respond to the receipt of a long space by going on-hook. Zn Soft Reset and Restore Profile The modem performs a soft reset and restores (recalls) the configuration profile according to the parameter supplied. If no parameter is specified, zero is assumed. Z0 Soft reset and restore stored profile 0. Z1 Soft reset and restore stored profile 1. 2.0 AT& COMMANDS: ============================================================================= &Cn RLSD (DCD) Option The modem controls the RLSD output in accordance with the parameter supplied. The parameter value, if valid, is written to S21 bit 5. &C0 RLSD remains ON at all times. Default. &C1 RLSD follows the state of the carrier. &Dn DTR Option This command interprets the ON to OFF transition of the DTR signal from the DTE in accordance with the parameter supplied. The parameter value, if valid, is written to S21 bits 3 and 4. &D0 DTR drop is interpreted according to the current &Q setting as follows. Default. &Q0,5,6 DTR is ignored (assumed ON). Allows operation with DTE's which don't provide DTR. &Q1,4 DTR drop causes the modem to hang up. Auto-answer is not affected. &Q2,3 DTR drop causes the modem to hang up. Auto-answer is inhibited. &D1 DTR drop is interpreted according to the current &Q setting as follows: &Q0,1,4,5,6 DTR drop is interpreted by the modem as if the asynchronous escape sequence had been entered. The modem returns to asynchronous command state without disconnecting. &Q2,3 DTR drop causes the modem to hang up. Auto-answer is inhibited. &D2 DTR drop is interpreted according to the current &Q setting as follows: &Q0..6 DTR drop causes the modem to hang up. Auto-answer is inhibited. &D3 DTR drop is interpreted according to the current &Q setting as follows: &Q0,1,4,5,6 DTR drop causes the modem to perform a soft reset as if the "Z" command were received. The &Y setting determines which profile is loaded. &Q2,3 DTR drop causes the modem to hang up. Auto-answer is inhibited. &Fn Restore Factory Configuration (Profile) The modem loads a factory default configuration profile. Two different factory profiles are available. After issuing an AT&F1 or AT&F0, you can view the profile's defaults by issuing an AT&V. A configuration profile consists of a subset of S Registers. &F0 Restore factory configuration 0 &F1 Restore factory configuration 1 &Gn Select Guard Tone The modem generates the guard tone selected by this command according to the parameter supplied (DPSK modulation modes only). This command may not be permitted in some countries. The parameter value, if valid, is written to S23 bits 6 and 7. &G0 Disables Guard Tone. Default. &G1 Disables Guard Tone. &G2 Selects 1800 Hz guard tone. &Kn Flow Control This command defines the DTE/DCE (terminal/modem) flow control mechanism. The parameter value, if valid, is written to S39 bits 0, 1, and 2. &K0 Disables flow control. &K3 Enables RTS/CTS flow control. (default for data modem modes) &K4 Enables XON/XOFF flow control. &K5 Enables transparent XON/XOFF flow control. &K6 Enables both RTS/CTS and XON/XOFF flow control. &Mn Asynchronous/Synchronous Mode Selection This command determines the DTR operating mode. The modem treats the &M command as a subset of the &Q command. &M0 Selects direct asynchronous operation. Note that the command sequence &M\N0 selects normal buffered mode, but the command sequence \N0&M0 selects the direct mode. This is because the \N0 command is analogous to the &Q6 command. The value 000b is written to S27 bits 3, 1, and 0 respectively. (See &Q) &M1 (This command is not supported and will return "OK" but will cause unknown results.)Selects synchronous connect mode with async off-line command mode. The value 001b is written to S27 bits 3, 1, and 0, respectively. &M2 (This command is not supported and will return "OK" but will cause unknown results.) Selects synchronous connect mode with async off-line command mode. Same as &M1 except &M2 enables DTR dialing of directory slot 0. The modem will disconnect if DTR is OFF for more than the period in S25 ( in units of hundredths of a second): The data connection will be synchronous. The value 010b is written to S27 bits 3, 1, and 0, respectively. &M3 (This command is not supported and will return "OK" but will cause unknown results.) Selects synchronous connect mode. This mode allows DTR to act as a talk/data switch. The call is manually initiated while DTR is inactive. When DTR becomes active, the handshake proceeds in originate or answer mode according to S14 bit 7. The value 011b is written to S27 bits 3, 1, and 0, respectively. &Qn Sync/Async Mode This command is an extension of the &M command and is used to control the connection modes permitted. It is used in conjunction with S36 and S48. NOTE: When the &Q0 to &Q4 command is issued to select the mode, the subsequent connect message will report the DCE speed regardless of the W command and S95 settings. &Q0 Selects direct asynchronous operation. The value 000b is written to S27 bits 3, 1, and 0 respectively. (See &M0) &Q1 Selects synchronous connect mode with async off-line command mode. The value 001b is written to S27 bits 3, 1, and 0, respectively. (See &M1) (This command is not supported and will return "OK" but will cause unknown results.) &Q2 Selects synchronous connect mode with async off-line command mode. The value 010b is written to S27 bits 3, 1, and 0, respectively. (See &M2) (This command is not supported and will return "OK" but will cause unknown results.) &Q3 Selects synchronous connect mode. This mode allows DTR to act as a talk/data switch. The call is manually initiated while DTR is inactive. When DTR becomes active, the handshake proceeds in originate or answer mode according to S14 bit 7. The value 011b is written to S27 bits 3, 1, and 0, respectively. (This command is not supported and will return "OK" but will cause unknown results.) &Q4 Select AutoSync operation. AutoSync operation, when used in conjunction with the Hayes Synchronous Interface (HSI) capability in the DTE, provides synchronous communication capability from an asynchronous terminal. Writes 100b to S27 bits 3, 1, and 0, respectively. Starting AutoSync. Set registers S19, S20, and S25 to the desired values before selecting AutoSync operation with &Q4. After the CONNECT message is issued, the modem waits the period of time specified by S25 before examining DTR. If DTR is on, the modem enters the synchronous operating state; if DTR is off, the modem terminates the line connection and returns to the asynchronous command state. Stopping AutoSync. AutoSync operation is stopped upon loss of carrier or the ON-to-OFF transition of DTR. Loss of carrier will cause the modem to return to the asynchronous command state. An ON-to-OFF transition of DTR will cause the modem to return to the asynchronous command state and either not terminate the line connection (&D1 active) or terminate the line connection (any other &Dn command active). &Q5 The modem will try to negotiate an error-corrected link. The modem can be configured using S36 to determine whether a failure will result in the modem returning on-hook or will result in fallback to an asynchronous connection. The value 101b is written to S27 bits 3, 1,and 0, respectively. Default &Q6 Selects asynchronous operation in normal mode (speed buffering). The value 110b is written to S27 bits 3, 1, and 0, respectively. &Rn RTS/CTS Option This selects how the modem controls CTS. CTS operation is modified if hardware flow control is selected The parameter value, if valid, is written to S21 bit 2. (see &K command) &R0 In sync mode, CTS tracks the state of RTS; the RTS-to-CTS delay is defined by S26. In Async mode, CTS acts according to V.25bis handshake. &R1 In sync mode, CTS is always ON (RTS transitions are ignored). In Async, CTS will drop only if required by flow control. Default. &Sn DSR Override This command selects how the modem will control DSR. The parameter value, if valid, is written to S21 bit 6. &S0 DSR will remain ON at all times. Default &S1 DSR will become active after answer tone has been detected and inactive after the carrier has been lost. &Tn Test and Diagnostics The modem will perform selected test and diagnostic functions according to the parameter supplied. A test can be run only when in an asynchronous operation in non-error-correction mode (normal or direct mode). To terminate a test in progress, the escape sequence (+++) must be entered first, except for parameters 7, and 8. If S18 is non-zero, a test will terminate automatically after the time specified by S18 and display the OK message. NOTE: The DTE must be less than or equal to the DCE. &T0 Terminates test in progress. Clears S16. &T1 Initiates local analog loopback, V.54 Loop 3. Sets S16 bit 0. If a connection exists when this command is issued, the modem hangs up. The CONNECT XXXX message is displayed upon the start of the test. &T2 Returns ERROR. &T3 Initiates local digital loopback, V.54 Loop 2. Sets S16 bit 2. If no connection exists, ERROR is returned. Sets S16 bit 4 when the test is in progress. &T4 Enables digital loopback acknowledgement for remote request, i.e., an RDL request from a remote modem is allowed. Sets S23 bit 0. Default &T5 Disables digital loopback acknowledgement for remote request, i.e., an RDL (remote digital loopback) request from a remote modem is denied. Clears S23 bit 0. &T8 Initiates local analog loopback, V.54 Loop 3, with self test. (In self test, a test pattern is looped back and checked by the modem.) If a connection exists, the modem hangs up before the test is initiated. When the test is terminated either via expiration of S18, or via the &T0 or "H" command, the number of detected errors is reported to the DTE. Sets S16 bit 6 when the test is in progress. This command may not be available in some countries due to PTT restrictions. &V Display Current Configuration and Stored Profiles Reports the current (active) configuration, the stored (user) profiles, and the four stored telephone numbers. The stored profiles and telephone numbers are not displayed if the NVRAM is not installed or is not operational as detected by the NVRAM test during reset processing. &Wn Store Current Configuration Saves the current (active) configuration (profile), including S Registers, in one of the two user profiles in NVRAM as denoted by the parameter value. This command will yield an ERROR message if the NVRAM is not installed or is not operational as detected by the NVRAM test. The current configuration is comprised of a list of storable parameters illustrated in the &V command. These settings are restored to the active configuration upon receiving an Zn command or at power up. (see &Yn command) &W0 Store the current configuration as profile 0. &W1 Store the current configuration as profile 1. &Yn Designate a Default Reset Profile Selects which user profile will be used after a hard reset. When &Yn is changed (e.g. &Y1 command) the parameter is automatically written to NVRAM. &Y0 The modem will use profile 0. &Y1 The modem will use profile 1. &Zn=x Store Telephone Number The modem can store up to 4 telephone numbers. Each dial string can contain a maximum of 42 digits. &Zn=x (n = 0 to 3, and x = dial string) (requires 256-byte NVRAM) 8.4 AT% COMMANDS: %En Enable/Disable Line Quality Monitor and Auto-Retrain Fallback/Fall Forward: Controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1 and %E3) or fall back when line quality is insufficient or fall forward when line quality is sufficient (%E2). Applies to dialup line only. The parameter value, if valid, is written to S41 bits 2 and 6. If enabled, the modem attempts to retrain for a maximum of 30 seconds. %E0 Disable line quality monitor and auto-retrain. Default. %E1 Enable line quality monitor and auto-retrain. %E2 Enable line quality monitor and fallback/fall forward. %E3 Enable line quality monitor and auto-retrain, but hang-up immediately when EQM reaches hang-up threshold. AKA Fast Hangup. When %E2 is active, the modem monitors the line quality (EQM). When line quality is insufficient, the modem will initiate a rate renegotiation to a lower speed within the V.32bis/V.32 modulation speeds. The modem will keep falling back if necessary until the speed reaches 4800 bps. Below this rate, the modem will do retrains only if EQM thresholds are exceeded. If the EQM is sufficient for at least one minute, the modem will initiate a rate renegotiation to a higher speed within the V.32/V.32bis modulation speeds. The rate renegotiation will be done without a retrain if a V.32bis connection is established. Speeds attempted during fallback/fall forward are those shown to be available in the rate sequences exchanged during the initial connection. Fallback/fall forward is available in error correction and normal modes, but not in direct mode or synchronous mode with external clocks. 8.4.2 %L-Line Signal Level: Returns a value which indicates the received signal level. The value returned is a direct indication (DAA dependent) of the receive level at the MDP, NOT at the telephone line connector. For example, 009 = -9 dbm, 043 = -43 dbm, and so on. 8.4.3 %Q - Line Signal Quality: Reports the line signal quality (DAA dependent). Returns the higher order byte of the EQM value. Based on the EQM value, retrain or fallback/fall forward may be initiated if enabled by %E1, %E2 or %E3. Example: AT%Q 015 8.4.4 %TTn - PTT Testing Utilities: Facilitates PTT testing of signal levels by providing continuous signals regardless of whether the modem is connected or not. The signal transmitted is in accordance with the parameter provided. This is a range of commands that allow the user to initiate a series of signals that are necessary for PTT approval. The signals emitted include answer tone, modulation, carriers, and other pertinent signals. A test is initiated on the receipt of an %TT ("T" is a password), and the test is aborted when any keyboard character is entered. The modem will continuously transmit the tone or carrier according to the parameter supplied. %TT00-%TT09 DTMF tone dial digits 0 to 9. %TT0A DTMF digit *. %TT0B DTMF digit A. %TT0C DTMF digit B. %TT0D DTMF digit C. %TT0E DTMF digit #. %TT0F DTMF digit D. %TT10 V.21 channel no. 1 mark (originate) symbol. %TT11 V.21 channel no. 2 mark symbol. %TT12 V.23 backward channel mark symbol. %TT13 V.23 forward channel mark symbol. %TT14 (NotSupported) V.22 originate (call mark) signalling at 600 bps. %TT15 V.22 originate (call mark) signalling at 1200 bps. %TT16 V.22bis originate (call mark) signalling at 2400 bps. %TT17 V.22 answer signalling (guard tone if PTT required). %TT18 V.22bis answer signalling (guard tone if required). %TT19 V.21 channel no. 1 space symbol. %TT20 V.32 9600 bps. %TT21 V.32bis 14400 bps. %TT1A V.21 channel no. 2 space symbol. %TT1B V.23 backward channel space symbol. %TT1C V.23 forward channel space symbol. %TT30 Silence (on-line), i.e., go off-hook. %TT31 V.25 answer tone. %TT32 1800 Hz guard tone. %TT33 V.25 calling tone (1300 Hz). %TT34 Fax calling tone (1100 Hz). %TT40 V.21 channel 2. %TT41 V.27ter 2400 bps. %TT42 V.27ter 4800 bps. %TT43 V.29 7200 bps. %TT44 V.29 9600 bps. %TT45 V.17 7200 bps long train. %TT46 V.17 7200 bps short train. %TT47 V.17 9600 bps long train. %TT48 V.17 9600 bps short train. %TT49 V.17 12000 bps long train. %TT4A V.17 12000 bps short train. %TT4B V.17 14400 bps long train. %TT4C V.17 14400 bps short train. To permit output signal spectra measurement, it is possible to transmit data in the absence of a received signal by setting S10 equal to 255. 8.5 AT\ COMMANDS: 8.6.2.1 \An - Select Maximum MNP Block Size: The modem will operate an MNP error corrected link using a maximum block size controlled by the parameter supplied. The parameter value, if valid, is written to S40 bits 6 and 7. \A0 64 characters \A1 128 characters Default \A2 192 characters \A3 256 characters 8.6.2.2 \Bn - Transmit Break to Remote: In non-error correction mode, the modem will transmit a break signal to the remote modem with a length in multiples of 100 mS according to parameter specified. If a number in excess of 9 is entered, 9 is used. The command works in conjunction with the \K command. In error correction mode, the modem will signal break through the active error correction protocol, giving no indication of the length. \B1-\B9 Break length in 100 mS units. (default = 3) (Non-error corrected mode only) NOTE: When the modem receives a break from the remote modem, break is passed to the DTE as follows: In non-error correction mode, the length is passed. 8.6.2.3 \Ln - MNP Block/Stream Mode Select: At connection time, this command controls the selection between block and stream modes of operation in MNP. The parameter value, if valid, is written to S41 bit 4. \L0 Use stream mode for MNP connection. Default \L1 Use interactive block mode for MNP connection. This command will accept block mode but implement stream mode. 8.5.1 \Gn - Modem-to-Modem Flow Control (XON/XOFF): In non-error correction mode, the modem enables or disables the generation or recognition of modem-to-modem XON/XOFF flow control according to the parameter supplied. The parameter value, if valid, is written to S41 bit 3. In error correction mode, the setting of modem-to-modem XON/XOFF flow control is ignored. However, the serial port flow control settings (AT&K) remain active during a reliable link. Due to the buffering system used in the modem, modem-to-modem flow control is normally disabled. \G0 Disables modem-to-modem XON/XOFF flow control. Default \G1 Enables modem-to-modem XON/XOFF flow control. 8.5.2 \Kn - Break Control: Controls the response of the modem to a break received from the DTE or the remote modem or the \B command according to the parameter supplied. The parameter value, if valid, is written to S40 bits 3, 4, and 5. The response is different for three separate states. The first state is where the modem receives a break from the DTE when the modem is operating in data transfer mode: \K0 Enter on-line command mode, no break sent to the remote modem. \K1 Clear data buffers and send break to remote modem. \K2 Same as 0. \K3 Send break to remote modem immediately. \K4 Same as 0. \K5 Send break to remote modem in sequence with transmitted data. Default. The second state is where the modem is in the on-line command state (waiting for AT commands) during a data connection, and the \B is received in order to send a break to the remote modem: \K0 Clear data buffers and send break to remote modem. \K1 Clear data buffers and send break to remote modem. (Same as 0) \K2 Send break to remote modem immediately. \K3 Send break to remote modem immediately. (Same as 2) \K4 Send break to remote modem in sequence with data. \K5 Send break to remote modem in sequence with data. (Same as 4) Default The third state is where a break is received from a remote modem during a non-error corrected connection: \K0 Clears data buffers and sends break to the DTE. \K1 Clears data buffers and sends break to the DTE. (Same as 0) \K2 Send a break immediately to DTE. \K3 Send a break immediately to DTE. (Same as 2) \K4 Send a break in sequence with received data to DTE. \K5 Send a break in sequence with received data to DTE. (Same as 4) Default Note: When S82 is modified, the modem converts the Hayes specific value to the \K format and updates S40 to match. 8.5.3 \Nn - Operating Mode: This command controls the preferred error correcting mode to be negotiated in a subsequent data connection. This command is affected by the firmware configuration. \N0 Selects normal speed buffered mode (disables error-correction mode) (Forces &Q6) \N1 Serial interface selected - selects direct mode and is equivalent to &M0, &Q0 mode of operation. (forces &Q0) Parallel interface selected - Same as \N0. \N2 Selects reliable (error-correction) mode. The modem will first attempt an LAPM connection and then an MNP connection. Failure to make a reliable connection results in the modem hanging up. (Forces &Q5, S36=4, and S48=7) \N3 Selects auto reliable mode. This operates the same as \N2 except failure to make a reliable connection results in the modem falling back to the speed buffered normal mode. (Forces &Q5, S36=7, and S48=7) Default \N4 Selects LAPM error-correction mode. Failure to make a LAPM error- correction connection results in the modem hanging up. (Forces &Q5 and S48=0) NOTE: The -K1 command can override the \N4 command. \N5 Selects MNP error-correction mode. Failure to make an MNP error- correction connection results in the modem hanging up. (Forces &Q5, S36=4, and S48=128) 8.8.3.2 \S - Report Active Configuration (Not supported on all modems) The modem reports the current (active) configuration for display. 8.6.1 AT% Commands: 8.6.1.1 %C - Enable/Disable Data Compression: Enables or disables data compression negotiation. The modem can perform data compression only on an error corrected link. The parameter value, if valid, is written to S41 bits 0 and 1. %C0 Disables data compression. Resets S46 bit 1. %C1 Enables MNP 5 data compression negotiation. Resets S46 bit 1. %C2 Enables V.42bis data compression. Sets S46 bit 1. %C3 Enables both V.42bis and MNP 5 data compression. Sets S46 bit 1. Default 8.7 MNP 10 COMMANDS: (Applies only to XJ2144, CC4144, and EM1144T models.) 8.7.1 AT) Commands: 8.7.1.1 )Mn - Enable Cellular Power Level Adjustment: Enables or disables automatic adjustment of the transmit power level during link negotiation for reliable links to accommodate the signaling requirements of cellular telephone equipment. The parameter value, if valid, is written to S40 bit 2. Note that the @Mn command sets the initial transmit level. )M0 Disables power level adjustment during MNP 10 link negotiation. Default )M1 Enables power level adjustment during MNP 10 link negotiation. 8.7.2 AT* and AT- Commands: 8.7.2.1 *Hn - Link Negotiation Speed: This command controls the connection speed for link negotiations before upshift occurs between two MNP Class 10 modems. The parameter value, if valid, is written to S28 bits 6 and 7. *H0 Link negotiation occurs at the highest supported speed. Default *H1 Link negotiation occurs at 1200 bps. *H2 Link negotiation occurs at 4800 bps. 8.7.2.2 -Kn - MNP Extended Services: Enables or disables conversion of a V.42 LAPM connection to an MNP 10 connection. The parameter value, if valid, is written to S40 bit 0. -K0 Disables V.42 LAPM to MNP 10 conversion. Default -K1 Enables V.42 LAPM to MNP 10 conversion. -K2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended Services initiation during V.42 LAPM answer mode detection phase. 8.7.2.3 -Qn - Enable Fallback to V.22 bis/V.22: Enables or disables fallback from MNP 10 to V.22 bis/V.22. The parameter value, if valid, is written to S41 bit 7. -Q0 Disables fallback to 2400 bps (V.22bis) and 1200 bps (V.22). Fallback is enabled only to 4800 bps. -Q1 Enables fallback to 2400 bps (V.22bis) and 1200 bps (V.22). Default 8.7.2.4 @Mn - Initial Cellular Power Level Setting: Sets the initial transmit power level for upshift at connect until line conditions can be determined. @M0 corresponds to -26 dBm, @M1 corresponds to -30 dBm, @M2 through @M10 correspond to -10 dBm, and @M11 through @M31 correspond to -11 dBm to -31 dBm , respectively. The parameter value, if valid, is written to S201 bit 0-4. @M0 -26 dBm @M1 -30 dBm @M2 -10 dBm @M3 - @M10 -10 dBm @M11 -11 dBm @M12 -12 dBm @M13 -13 dBm @M14 -14 dBm @M15 -15 dBm @M16 -16 dBm @M17 -17 dBm @M18 -18 dBm @M19 -19 dBm @M20 -20 dBm @M21 -21 dBm @M22 -22 dBm @M23 -23 dBm @M24 -24 dBm @M25 -25 dBm @M26 -26 dBm Default @M27 -27 dBm @M28 -28 dBm @M29 -29 dBm @M30 -30 dBm @M31 -31 dBm 8.7.2.5 :E - Compromise Equalizer Enable: Enables or disables the V.32 compromise equalizer. The parameter value, if valid, is written to S201 bit 5. This command can be used when the modem is attached to either a flat line or a cellular connection. :E0 Disables the equalizer. :E1 Enables the equalizer. Default 8.13 REGISTER SUMMARY: How S Registers work -------------------- Your Megahertz modem has storage spaces called registers which can hold a user-specified range of values. To set all registers to their default values issue an AT&F <enter> in the terminal mode of a communications package. To set the value of a specific register, issue an ATSn=xxx <enter >, where n is the register number, and xxx is the decimal (base 10) value. For example, to change register 8 to wait for 3 seconds when a comma is encountered in the dialing string, you would type in ATS8=3 <enter> in terminal mode. The "Save?" column indicates if the register's contents are saved in a user profile when an AT&W or AT&W1 is issued to the modem. Registers not specifically listed are reserved or unsupported. Register Function Range Units Default -------- ----------------------------------- ------ ------------ ------- S0 Rings to Auto-Answer 0-255 Rings 0 S1 Ring Counter 0-255 Rings 0 S2 Escape Character 0-255 ASCII 43 S3 Carriage Return Character 0-127 ASCII 13 S4 Line Feed Character 0-127 ASCII 10 S5 Backspace Character 0-255 ASCII 8 S6 Wait Time for Dial Tone 2-255 seconds 4 S7 Wait for Carrier 1-255 seconds 50 S8 Pause Time for (,) Comma 0-255 seconds 2 S9 Carrier Detect Response Time 1-255 1/10 sec 6 S10 Carrier Loss Disconnect Time 1-255 1/10 sec 14 S11 Touch Tone (DTMF) Duration 50-255 1/1000 sec 95 S12 Escape Code Guard Time 0-255 2/100sec 50 S14 General Bit Mapped Options 138 (8ah) S16 Test Mode Bit Mapped Options (&T) 0 S18 Test Timer 0-255 seconds S21 V.24/General Bit Mapped Options-- 4 (04h) S22 Speaker/Results Bit Mapped Options-- 117 (75h) S23 General Bit Mapped Options-- 55 (37h) S24 Sleep Inactivity Timer 0-255 seconds 0 S25 Delay to DTR off 0-255 1/100 sec 5 S26 RTS-to-CTS Delay 0-255 1/100 sec 1 S27 General Bit Mapped Options-- 73 (49h) S28 General Bit Mapped Options-- 0 S29 Flash Dial Modifier Time 0-255 10 ms 0 S30 Disconnect Activity Timer 0-255 10 sec 0 S31 General Bit Mapped Options-- 2 S32 XON Character 0-255 ASCII 17 (11h) S33 XOFF Character 0-255 ASCII 19 (13h) S36 LAPM Failure Control-- 7 S37 Line Connection Speed-- 0 S38 Delay Before Forced Hangup 0-255 seconds 20 S39 Flow Control-- 3 S40 General Bit Mapped Options-- 105 (69h) No MNP 10. 107 (6Bh) MNP 10 S41 General Bit Mapped Options-- 3 S46 Data Compression Control-- 138 S48 V.42 Negotiation Control-- 7 S80 Soft Switch Functions-- 0 S82 LAPM Break Control-- 128 (40h) S86 Call Failure Reason Code 0-255 S91 PSTN Transmit Attenuation Level l0-15 dBm 10 S92 Fax Transmit Attenuation Level l0-15 dBm 10 S95 Result Code Messages Control-- 0 S99 Leased Line Transmit Level 0-15 dBm 10 S201 Cellular Transmit Leve l0-63 58 S202 Remote Access Escape Character 0-255 ASCII 170 9.0 XJ3144 and CC6144 Commands ============================================================================= The commands listed below apply only to the XJ3144 and CC6144. Dn Dial ------------ In addition to the dial modifiers listed under the Dn command hading in Section 1.0, the following modifiers are available on the XJ3144 and CC6144. J Perform MNP10 link negotiation at highest speed for this call only. K Enable power level adjustment during MNP10 link for this call only. R Wait 10 seconds after dialing and go into answer mode. Must appear at end of dial string. & Wait for credit card bong. In Product Identification ------------------------------ In addition to the product identification commands listed in Section 1.0, I7 can be used to report which cellular cable is attached, if any. &Fn Restore Factory Profile ------------------------------- When an &F is issued, -SEC is set to 0, disabling MNP10EC. &F1 sets -SEC to 1, enabling MNP10EC. See -SEC below. -SDR=n Distinctive Ring Reporting ---------------------------------- -SDR=1 Type 1 Distinctive Ring Detect -SDR=2 Type 2 Distinctive Ring Detect -SDR=3 Type 1 and Type 2 Distinctive Ring Detect -SDR=4 Type 3 Distinctive Ring Detect -SDR=5 Type 1 and Type 3 Distinctive Ring Detect -SDR=6 Type 2 and Type 3 Distinctive Ring Detect -SDR=7 Types 1, 2, and 3 Distinctive Ring Detect Distinctive Ring Types Type On Off On Off On Off Sound ------------------------------------------------------------------------- 1 2.0 4.0 Rinnnnnnnnnng 2 0.8 0.4 0.8 4.0 Ring Ring 3 0.4 0.2 0.4 0.2 0.8 4.0 Ring Ring Rinnng -SEC=n LAPM and MNP Link Control --------------------------------- -SEC=0 Disable LAPM or MNP10. EC transmit level set in register S91. -SEC=1,0..30 Enable LAPM or MNP10. EC transmit level set to value after comma (0 to 30). ~Dn Factory Configured Operating Profile -------------------------------------------- ~D0 Disable (No Error Correction, No Data Compression) ~D1 MNP4 ~D2 MNP5 ~D3 V.42 ~D4 V.42bis $H Help Screen ------------------- Sending the $H command causes the modem to return the following help screen: Type in the letters AT followed by one of the following commands (CMD), to activate the following modem features. CMD MODEM FEATURE CMD MODEM FEATURE --- ------------- --- ------------- $H Displays this help screen F0 Enable auto-mode detection &F0 Reset to Factory Defaults F5 Force 2400 connection %C0 Disable Data Compression F8 Force 9600 connection %C3 Enable Data Compression F10 Force 14400 connection &K0 Disable Flow Control M0 Set Speaker - always off &K3 Enable RTS/CTS Flow Control M1 Set Speaker - on until connect &K4 Enable XON/XOFF Flow Control L0 Set Speaker volume low X3 Disable Dialtone detection L2 Set Speaker volume medium X4 Enable Dialtone detection L3 Set Speaker volume high ~D0 Disable error and data compression ~D1 Enable MNP4 (error correction without data compression) ~D2 Enable MNP5 (MNP4 with 2:1 data compression) ~D3 Enable V.42 (error correction) ~D4 Enable V.42bis (V.42 with 4:1 data compression) 10.0 S Register Definitions ============================================================================= 8.14.1 S0 - Number of Rings to Auto-Answer: Sets the number of the rings required before the modem automatically answers a call. Setting this register to zero disables auto-answer mode. Range: 0-255 rings Default: 0 (US models) 2 (W-Class models) 8.14.2 S1 - Ring Counter: S1 is incremented each time the modem detects ring signal on the telephone line. S1 is cleared if no rings occur over an eight second interval. Range: 0-255 rings Default: 0 8.14.3 S2 - Escape Character: S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to an ASCII "+". A value over 127 disables the escape process, i.e., no escape character will be recognized. Range: 0-255, ASCII decimal Default: 43 (+) 8.14.4 S3 - Carriage Return Character: Sets the command line and result code terminator character. Pertains to asynchronous operation only. Range: 0-127, ASCII decimal Default: 13 (Carriage Return) 8.14.5 S4 - Line Feed Character: Sets the character recognized as a line feed. Pertains to asynchronous operation only. The Line Feed control character is output after the Carriage Return control character if verbose result codes are used. Range: 0-127, ASCII decimal Default: 10 (Line Feed) 8.14.6 S5 - Backspace Character: Sets the character recognized as a backspace. Pertains to asynchronous operation only. The modem will not recognize the Backspace character if it is set to a value that is greater than 32 ASCII. This character can be used to edit a command line. When the echo command is enabled, the modem echoes back to the local DTE the Backspace character, an ASCII space character and a second Backspace character; this means a total of three characters are transmitted each time the modem processes the Backspace character. Range: 0-32, ASCII decimal Default: 8 (Backspace) 8.14.7 S6 - Wait Time for Dial Tone Before Blind Dialing, or After "W" Dial Modifier (W-Class models): 1. Sets the length of time, in seconds, the the modem will wait before starting to dial after going off-hook when blind dialing. This operation, however, may be affected by some ATX options according to country restrictions. The "Wait for Dial Tone" call progress feature (W dial modifier in the dial string) will override the value in register S6. 2. For W-Class models, S6 sets the length of time, in seconds, that the modem will wait for dial tone when encountering a "W" dial modifier before continuing with the next dial string parameter. The modem always pauses for a minimum of 2 seconds, even if the value of S6 is less than 2 seconds. Range: 2-255 seconds Default: 4 8.14.8 S7 - Wait Time For Carrier After Dial, For Silence, or For Dial Tone After "W" Dial Modifier (US Models): 1. Sets the length of time, in seconds, that the modem will wait for carrier before hanging up. The timer is started when the modem finishes dialing (originate), or 2 seconds after going off-hook (answer). In originate mode, the timer is reset upon detection of answer tone if allowed by country restrictions. 2. Sets the length of time, in seconds, that modem will wait for silence when encountering the @ dial modifier before continuing with the next dial string parameter. 3. For US Models, S7 sets the length of time, in seconds, that modem will wait for dial tone when encountering the "W" dial modifier before continuing with the next dial string parameter. Range: 1-255 seconds Default: 50 8.14.9 S8 - Pause Time For Dial Delay: Sets the time, in seconds, that the modem must pause when the "," dial modifier is encountered in the dial string. Range: 2-255 seconds Default: 2 8.14.10 S9 - Carrier Detect Response Time: Sets the time, in tenths of a second, that the carrier must be present before the modem considers it valid and turns on RLSD. As this time is increased, there is less chance to detect a false carrier due to noise from the telephone line. Range: 1-255 tenths of a second Default: 6 (0.6 second) 8.14.11 S10 - Lost Carrier To Hang Up Delay: Sets the length of time, in tenths of a second, that the modem waits before hanging up after a loss of carrier. This allows for a temporary carrier loss without causing the local modem to disconnect. When register S10 is set to 255, the modem functions as if a carrier is always present. The actual interval the modem waits before disconnecting is the value in register S10 minus the value in register S9. Therefore, the S10 value must be greater than the S9 value or else the modem disconnects before it recognizes the carrier. Range: 1-255 tenths of a second Default: 14 (1.4 seconds) 8.14.12 S11 - DTMF Tone Duration: Sets the duration of tones in DTMF dialing (US models only). This value has no effect on pulse dialing. For W-Class models, this parameter is a country parameter loaded by ConfigurACE. Range: 50-255 milliseconds Default: 95 (95 milliseconds) 8.14.13 S12 - Escape Code Guard Time: Defines the maximum period, in fiftieths of a second, allowed between consecutive asynchronous escape characters (+) for the escape sequence to be considered valid. Range: 0-255 1/50 of a second Default: 50 (1 second) 8.14.14 S13 - Reserved: 8.14.15 S14 - General Bit Mapped Options: Indicates the status of command options. Default: 138 (8Ah) (10001010b) Bit 0 - This bit is ignored. Bit 1 - Command echo (En) 0 = Disabled (E0) 1 = Enabled (E1) Default Bit 2 - Quiet mode (Qn) 0 = Send result codes (Q0) Default 1 = Do not send result codes (Q1) Bit 3 - Result codes (Vn) 0 = Numeric (V0) 1 = Verbose (V1) Default Bit 4 - Reserved Bit 5 - Tone (T)/Pulse (P) 0 = Tone (T) Default 1 = Pulse (P) Bit 6 - Reserved Bit 7 - Originate/Answer 0 = Answer 1 = Originate Default 8.14.16 S15 - Reserved: 8.14.17 S16 - General Bit Mapped Test Options: Indicates the test in progress status. Default: 0 Bit 0 - Local analog loopback 0 = Disabled Default 1 = Enabled (&T1) Bit 1 - Not used Bit 2 - Local digital loopback 0 = Disabled Default 1 = Enabled (&T3) Bit 3 - Remote digital loopback (RDL) status 0 = Modem not in RDL Default 1 = RDL in progress Bit 4 - RDL requested (AT&T6) 0 = RDL not requested Default 1 = RDL requested (&T6) Bit 5 - RDL with self test 0 = Disabled Default 1 = Enabled (&T7) Bit 6 - Local analog loopback (LAL) with self test 0 = Disabled Default 1 = Enabled (&T8) Bit 7 - Not used 8.14.18 S17 - Reserved: 8.14.19 S18 - Test Timer: Sets the length of time, in seconds, that the modem conducts a test (commanded by &Tn) before returning to the command mode. If this register value is zero, the test will not automatically terminate; the test must be terminated from the command mode by issuing an &T0 or "H" command. When S18 is non-zero, the modem returns the OK message upon test termination. Range: 0-255 seconds Default: 0 8.14.20 S19 - AutoSync Register: Defines the options for AutoSync operation (see Q4 command). S19 must be set to the desired value before &Q4 is issued. Default: 0 Bit 0 - Reserved Bit 1 - BSC/HDLC format select 0 = BSC selected Default 1 = HDLC selected Bit 2 - Address detection enable/disable 0 = Disabled Default 1 = Enabled Bit 3 - NRZI/NZI coding select 0 = NRZI Default 1 = NZI Bit 4 - Idle indicator select 0 = Mark idle Default 1 = Flag or sync idle Bit 5-7 Reserved 8.14.21 S20 - AutoSync HDLC Address or BSC Sync Character: Defines the HDLC address (S19 bit 1=1) or BSC Sync character (S19 bit 1=0) for AutoSync operation (See &Q4 command). S20 must be set to the desired value before &Q4 is issued. Range: 0-255 seconds Default: 0 8.14.22 S21 - V.24/General Bit Mapped Options: Indicates the status of command options. Default: 4 (04h) (00000100b) Bit 0 - Set by &Jn command but ignored otherwise. 0 = &J0 Default 1 = &J1 Bit 1 - Reserved Bit 2 - CTS behavior (&Rn) 0 = CTS tracks RTS (&R0) 1 = CTS always on (&R1) Default Bit 3,4 - DTR behavior (&Dn) 0 = &D0 selected Default 1 = &D1 selected 2 = &D2 selected 3 = &D3 selected Bit 5 - RLSD (DCD) behavior (&Cn) 0 = &C0 selected Default 1 = &C1 selected Bit 6 - DSR behavior (&Sn) 0 = &S0 selected Default 1 = &S1 selected Bit 7 - Long space disconnect (Yn) 0 = Y0 Default 1 = Y1 8.14.23 S22 - Speaker/Results Bit Mapped Options: Indicates the status of command options. Default: 118 (76h) (01110110b) Bit 0,1 - Speaker volume (Ln) 0 = Off (L0) 1 = Low (L1) 2 = Medium (L2) Default 3 = High (L3) Bit 2,3 - Speaker control (Mn) 0 = Disabled (M0) 1 = Off on carrier (M1) Default 2 = Always on (M2) 3 = On during handshake (M3) Bit 4,5,6 - Limit result codes (Xn) 0 = X0 4 = X1 5 = X2 6 = X3 7 = X4 Default Bit 7- Reserved 8.14.24 S23 - General Bit Mapped Options: Indicates the status of command options. Default: 55 (37h) (00110111b) (US models) 183 (B7h) (10110111b) (W-Class models) Bit 0- Grant RDL 0 = RDL not allowed (&T5) 1 = RDL allowed (&T4) Default Bit 1,2,3 - Assumed DTE Rate 0 = 0 - 300 bps 1 = 600 bps 2 = 1200 bps 3 = 2400 bps Default 4 = 4800 bps 5 = 9600 bps 6 = 19200 bps Bit 4,5 - Assumed DTE parity 0 = even 1 = not used 2 = odd 3 = none Default Bit 6,7 - Guard tone (&Gn) 0 = None (&G0) (default for US models) 1 = None (&G1) 2 = 1800 Hz (&G2) (default for W-Class models) 8.14.25 S24 - Sleep Inactivity Timer: Sets the length of time, in seconds, that the modem will operate in normal mode with no detected telephone line or DTE line activity before entering low-power sleep mode. The timer is reset upon any DTE line or telephone line activity. If the S24 value is zero, neither DTE line nor telephone inactivity will cause the modem to enter the sleep mode. Range: 0-255 seconds Default: 1 8.14.26 S25 - Delay To DTR: Sets the length of time that the modem will ignore DTR before hanging up. Its units are seconds for synchronous modes and one hundredths of a second for other modes. Range: 0-255 (1 second for synchronous modes 1;0.01 second otherwise) Default: 5 8.14.27 S26 - RTS to CTS Delay: Sets the time delay, in hundredths of a second, before the modem turns CTS ON after detecting an OFF-to-ON transition on RTS when &R0 is commanded. Pertains to synchronous operation only. Range 0-255 hundredths of a second Default: 1 8.14.28 S27 - General Bit Mapped Option: Indicates the status of command options. Default: 73 (49h) (01001001b) (US models with ECC) 74 (4Ah) (01001010b) (US models without ECC) 9 (09h) (00001001b) (W-Class models) Bit 3,1,0 Selection (&Mn/&Qn) 3,1,0 0,0,0 = &M0 or &Q0 0,0,1 = &M1 or &Q1 0,1,0 = &M2 or &Q2 0,1,1 = &M3 or &Q3 1,0,0 = &Q4 1,0,1 = &Q5 (default for ECC models) 1,1,0 = &Q6 (default for non-ECC models) Bit 2 - Leased line control (&Ln) 0 = Dial up line (&L0) Default 1 = Leased line (&L1) Bit 4,5 - Internal clock select (&Xn) 0 = Internal clock (&X0) Default 1 = External clock (&X1) 2 = Slave clock (&X2) Bit 6 - CCITT/Bell mode select (Bn) 0 = CCITT mode (B0) (default for W-Class models) 1 = Bell mode (B1) (default for US models) Bit 7 - Reserved 8.14.29 S28 - General Bit Mapped Options: Default: 0 Bit 0 - V.23 split screen (\W) 0 = Disabled (\W0) Default 1 = Enabled (\W1) Bit 1 - V.23 split screen direction 0 = 75 Tx/1200 Rx (%F1) Default 1 = 1200 Tx/75 Rx Bit 2 - Reserved (always 0) Bit 3,4 - Pulse dialing (&Pn) 0 = 39%-61% make/break ratio at 10 pulses per second(&P0) Default 1 = 33%-67% make/break ratio at 10 pulses per second(&P1) 2 = 39%-61% make/break ratio at 20 pulses per second(&P2) 3 = 33%-67% make/break ratio at 20 pulses per second(&P3) Bit 5 - Reserved Bit 6,7 - MNP link negotiation speed (*Hn) 0 = Link negotiation at highest speed (*H0) Default 1 = Link negotiation at 1200 bps (*H1) 2 = Link negotiation at 1200 bps (*H1) 8.14.30 S29 - Flash Dial Modifier Time: Sets the length of time, in units of 10 mS, that the modem will go on-hook when it encounters the flash (!) dial modifier in the dial string. The time can be limited as it is a country dependent parameter. Range: 70 10 mS intervals Default: 70 (disabled) 8.14.31 S30 - Disconnect Inactivity Timer: Sets the length of time, in tens of seconds, that the modem will stay on-line before disconnecting when no data is sent or received. In error- correction mode, any data transmitted or received will reset the timer. In other modes, any data transmitted will reset the timer. The timer is inoperative in synchronous mode. Range: 0-255 tens of seconds (0-2550 seconds) Default: 0 (disabled) 8.14.32 S31 - General Bit Mapped Options: Default: 194 (C2h) (11000010b) Bit 0 - Reserved Bit 1 - Controls auto line speed detection (Nn) 0 = Disabled (N0) 1 = Enabled (N1) Default Bit 2,3 - Controls error correction progress messages (Wn) 0 = DTE speed only (W0) Default 1 = Full reporting (W1) 2 = DCE speed only (W2) Bit 3 - Reserved Bit 4-7 - Reserved 8.14.33 S32 - XON Character: Sets the value of the XON character. Range: 0-255, ASCII decimal Default: 17 (11h) 8.14.34 S33 - XOFF Character: Sets the value of the XOFF character. Range: 0-255, ASCII decimal Default: 19 (13h) 8.14.35 S34-S35 - Reserved: 8.14.36 S36 - LAPM Failure Control (Applies to ECC Models Only): Default: 7 (07h) (00000111b) Bit 0-2 - This value indicates what should happen upon a LAPM failure. These fallback options are initiated immediately upon connection if S48=128. If an invalid number is entered, the number is accepted into the register, but S36 will act as if the default value has been entered. 0 = Modem disconnects. 1 = Modem stays on-line and a Direct mode connection is established. 2 = Reserved. 3 = Modem stays on-line and a Normal mode connection is established. 4 = An MNP connection is attempted and if it fails, the modem disconnects. 5 = An MNP connection is attempted and if it fails, a direct mode connection is established. 6 = Reserved. 7 = An MNP connection is attempted and if it fails, a normal mode connection is established. Default Bit 3-7 - Reserved 8.14.37 S37 - Desired Line Connection Speed: Default: 0 Bit 0-3 - Desired line connection speed. This is interlinked with the Fn command. If an invalid number is entered, the number is accepted into the register, but S37 will act as if the default value has been entered. 0 = Attempt auto mode connection (F0). Default 1-3= Attempt to connect at 300 bps (F1). 4 = Reserved. 5 = Attempt to connect at 1200 bps (F4). 6 = Attempt to connect at 2400 bps (F5). 7 = Attempt to connect at V.23 (F3). 8 = Attempt to connect at 4800 bps (F6). 9 = Attempt to connect at 9600 bps (F8). 10 = Attempt to connect at 12000 bps (F9). 11 = Attempt to connect at 14400 bps (F10). 12 = Attempt to connect at 7200 bps (F7). Bit 4-7 - Reserved 8.14.38 S38 - Delay Before Forced Hang Up: This register specifies the delay between the modem's receipt of the "H" command to disconnect (or ON-to-OFF transition of DTR if the modem is programmed to follow the signal), and the disconnect operation. Applicable to error-correction connection only. This register can be used to ensure that data in the modem buffer is sent before the modem disconnects. 1. If S38 is set to a value between 0 and 254, the modem will wait that number of seconds for the remote modem to acknowledge all data in the modem buffer before disconnecting. If time expires before all data is sent, the NO CARRIER result code will be issued to indicate that data has been lost. If all data is transmitted prior to time-out, the response to the H0 command will be OK. 2. If S38 is set to 255, the modem does not time-out and continues to attempt to deliver data in the buffer until the connection is lost or the data is delivered. Range: 0-255 seconds Default: 20 8.14.39 S39 - Flow Control: Default: 3 (03h) (00000011b) Bits 0-2 - Status of command options 0 = No flow control 3 = RTS/CTS (&K3) Default 4 = XON/XOFF (&K4) 5 = Transparent XON (&K5) 6 = Both methods (&K6) Bits 3-7 - Reserved 8.14.40 S40 - General Bit Mapped Options: Indicates the status of command options. Default: 104 (68h) (01101000b) Bit 0-1 MNP Extended Services (-Kn) [High Speed] 0 = Disable extended services (-K0) (default for non-MNP 10 models) 1 = Enable extended services (-K1) (default for MNP 10 models) 2 = Enable extended services (-K2) Bit 0 - MNP Extended Services (-Kn) [Low Speed] 0 = Disable extended services (-K0) (default for non-MNP 10 models) 1 = Enable extended services (-K1) (default for MNP 10 models) Bit 1 - Enable fallback to V.22bis/V.22 (-Qn) [Low Speed] 0 = Disabled (-Q0) 1 = Enabled (-Q1) Default Bit 2 - Power Level Adjustment for Cellular Use ()Mn) 0 = Auto-adjustment ()M0) Default 1 = Force adjustment ()M1) Bit 3-5 - Break handling (\Kn) 0 = \K0 1 = \K1 2 = \K2 3 = \K3 4 = \K4 5 = \K5 Default Bit 6-7 - MNP block size (\An) 0 = 64 chars (\A0) 1 = 128 chars (\A1) Default 2 = 192 chars (\A2) 3 = 256 chars (\A3) 8.14.41 S41 - General Bit Mapped Options: Indicates the status of command options. Default: 131 (83h) (10000011b) Bits 0-1 - Compression selection (%Cn) 0 = Disabled (%C0) 1 = MNP 5 (%C1) 2 = V.42 bis (%C2) 3 = MNP 5 and V.42 bis (%C3) Default Bit 2,6 - Auto retrain and Fallback/fall forward (%En) Bit 6 Bit 2 0 0 = Retrain and Fallback/fall forward disabled (%E0) Default 0 1 = Retrains enabled (%E1) 1 0 = Fallback/fall forward enabled (%E2) (not applicable to RC96V24AC and RC14V24AC) Bit 3 - Modem-to-modem flow control 0 = Disabled (\G0) Default 1 = Enabled (\G1) Bit 4 - Block mode control (\Ln) 0 = Stream mode (\L0) Default 1 = Block mode (\L1) Bit 5 - Reserved Bit 7 - Enable fallback to V.22 bis/V.22 (-Qn) [High Speed] 0 = Disabled (-Q0) 1 = Enabled (-Q1) Default 8.14.42 S46 - Data Compression Control: Controls selection of compression. The following actions are executed for the given values: Range: 136 or 138 Default: 138 S46=136 Execute error correction protocol with no compression. S46=138 Execute error correction protocol with compression. Default 8.14.43 S48 - V.42 Negotiation Action: The V.42 negotiation process determines the capabilities of the remote modem. However, when the capabilities of the remote modem are known and negotiation is unnecessary, this process can be bypassed if so desired. Range: 0, 7, or 128 If an invalid number is entered, it is accepted into the S Register, but S48 will act as if 128 has been entered. Default: 7 S48=0 Disable negotiation; bypass the detection and negotiation phases; and proceed with LAPM. S48=7 Enable negotiation. Default S48=128 Disable negotiation; bypass the detection and negotiation phases; and proceed at once with the fallback action specified in S36. Can be used to force MNP. 8.14.44 S80 - Soft-Switch Functions: (Not Supported) S80 is only applicable if the EPROM has been so customized by ConfigurACE. S80 bits are the "soft" equivalent of four hardware input signals. The hardware signal is indicated corresponding to each bit. Default: 1 Bit 0 - Must be set to a 1 Bit 1 - Reserved Bit 2 - Reserved Bit 3 - Leased line originate/answer select 0 = Answer select 1 = Originate select Bit 4 - Leased line enable/disable 0 = Disabled 1 = Enabled Bit 5 - V.25bis/AT command mode select (AT/V25B signal) 0 = AT selected 1 = V.25bis selected Bit 6 - Remote configuration permitted (REMCONF signal) 0 = Remote configuration not permitted 1 = Remote configuration permitted Bit 7 - Call back security enforcement (SECACC signal) 0 = Call back security disabled 1 = Call back security enabled 8.14.45 S82 - Break Handling Options: Break signals provide a way for the user to get the attention of the remote modem. The break type depends on the specific application. LAPM specifies three methods of break signal handling: In sequence, expedited, and destructive. If an invalid number is entered, it is accepted into the S Register, but S82 will act as if the default value has been entered. Range: 3, 7, or 128 Default: 128 S82=3 Expedited: Modem sends a break immediately; data integrity is maintained both ahead of and after the break. S82=7 Destructive: Modem sends a break immediately; data being processed by each modem at the time of the break is destroyed. S82=128 In sequence: Modem sends a break in sequence with any transmitted data; data integrity is maintained both ahead of and after the break. Default S86 Call Failure Reason Code: When the modem issues a NO CARRIER result code, a value is written to this S Register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. The cause codes are: S86=0 Normal disconnect, no error occurred. S86=4 Loss of carrier. S86=5 V.42 negotiation failed to detect an error-correction modem at the other end. S86=6 No response to feature negotiation. S86=7 This modem is asynchronous only; the other modem is synchronous only. S86=8 No framing technique in common. S86=9 The modems could not find a common protocol. S86=10 Bad response to feature negotiation. S86=11 No sync information from remote modem. S86=12 Normal disconnect initiated by the remote modem. S86=13 Remote modem does not respond after 10 re-transmissions of the same message. S86=14 Protocol violation. S91 PSTN Transmit Attenuation Level: Sets the transmit attenuation level from 0 to 15 dbm for the PSTN mode, resulting in a transmit level from 0 to -15 dbm. Default: 10 (-10 dBm transmit level) S92 Fax Transmit Attenuation Level: Sets the transmit attenuation level from 0 to 15 dbm for the fax mode, resulting in a transmit level from 0 to -15 dbm. Default: 10 (-10 dBm transmit level) S95 Extended Result Codes: The bits in this register can be set to override some of the Wn command options. A bit set to a 1 in this register will enable the corresponding result code regardless of the Wn setting. Also, refer to Table V. Default: 0 Bit 0 = CONNECT result code indicates DCE speed instead of DTE speed. Bit 1 = Append/ARQ to CONNECT XXXX result code in error-correction mode (XXXX = rate; see Table VI). Bit 2 = Enable CARRIER XXXX result code (XXXX = rate; see Table VI). Bit 3 = Enable PROTOCOL XXXX result code (XXXX = protocol identifier; see Table VI). Bit 5 = Enable COMPRESSION result code (XXXX = compression type; see Table VI). S99 Leased Line Transmit Attenuation Level: Sets the transmit level, in dbm, for the leased line mode. Default: 10 S201 MNP10 Parameters: The bits in this register can be set to override some of the Wn command options. A bit set to a 1 in this register will enable the corresponding result code regardless of the Wn setting. Also, refer to Table V. Default: 58 (3Ah) (00111010b) Bit 0-4 = Initial Cellular Power Level Setting (@Mn) Bit 5 = Compromise Equalizer Enable Command (:En) S202 Remote Access Escape Character: S202 holds the decimal value of the ASCII character used as the escape character in the escape sequence from on-line to Remote Access. S202 works similarly to S2 except that the S2 escape character is used in the escape sequence from on-line to the command mode. Range: 0-255, ASCII decimal Default: 170 (Escape disabled) A value over 127 disables the escape process, i.e., no escape character will be recognized. The default S202 value of 170 disables the escape process to Remote Access (whereas the default S2 value enables escape to command mode). If 128 is subtracted from 170 (i.e., bit 7 is reset), the resulting 42 is the ASCII code for the "*" character. The "*" character is commonly used as the Remote Access escape character. The Remote Access escape sequence consists of four characters with a fixed escape guard time of 1 second. Only the character selected by S202 is valid. When the "*" is used for the escape character, the escape sequence is "****". The Remote Access escape sequence works when the modems are connected in any mode (normal, LAPM or MNP) except direct mode. The modem on which the remote commands are typed (the "local modem") does not need any special code associated with the remote configuration. The "remote modem" (whose configuration will be modified remotely) must have Remote Configuration Mode (RCM) enabled (bit 6 of S80). The escape sequence entered by the user on the local modem is recognized by the remote modem, which then sends a message to the local modem prompting for entry of the " remote password". From then on, operation is similar to RCM except for slight differences of presentation. The remote modem will send a ">" prompt before each AT command. The user must type the AT prefix before the command(s), which is not required by RCM. Several commands on the same line can be accepted. Some potentially hazardous AT commands are barred in Remote Access: ATO, ATZ, AT&T, AT\B, AT*C, AT*L, AT*P, and ATZ (note that ATA and ATD are automatically barred because the modem is already connected). To exit Remote Access, enter command AT*X. Upon exiting Remote Access, the normal data link is re- established and the "CONNECT" message is issued to the DTE. (note that in RCM, exit is to the command mode, but actually, in both cases, return is to the previous state before entering Remote Access/RCM). AT*R and AT*E commands also operate the same as in RCM. Remote Access can be exited by typing a remote ATH command. The connection will be terminated and a "NO CARRIER" response will be issued from the local modem to the DTE since the hangup was actually performed by the remote modem. ========================================================================= Copyright US Robotics Mobile Communications Corp. All other product names are trademarks or registered trademarks of their respective holders in the United States and/or in other countries.