3. AT COMMAND SET

3.1. AT COMMAND GUIDELINES

3.1.1. AT Commands, DTE Adaption

3.1.2. AT Command Format

The modem supports the editing of command lines by recognizing a backspace character. When modem echo is enabled, the modem responds to receipt of a backspace or delete by echoing a backspace character, a space character, and another backspace. The hex value to be used for the backspace character is programmable through register S5. Values equal to 0 or greater than 127, or the value which corresponds to the carriage return character, cannot be used for the backspace character. This editing is not applicable to the AT header of a command. A command line may be aborted at any time by entering < cntrl-x > (18h).

The AT sequence may be followed by any number of commands in sequence, except for commands such as Z, D, or A. Commands following commands Z, D, or A on the same command line will be ignored. The maximum number of characters on any command line is 256 (including "A" and "T"). If a syntax error is found anywhere in a command line command, the remainder of the line will be ignored and the ERROR result code will be returned.

Most commands entered with parameters out of range will not be accepted and the ERROR response will be returned to the DTE.

Commands will only be accepted by the modem once the previous command has been fully executed, which is normally indicated by the return of an appropriate result code. Execution of commands D and A, either as a result of a direct command or a re execute command, will be aborted if another character is entered before completion of the handshake.

3.1.3. Escape Code Sequence

3.2. AT COMMAND SET

3.2.1. AT Commands

A/ - Re-execute Command

The principle application of this command is to place another call (using the Dial command) that failed to connect due to a busy line, no answer, or a wrong number. 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.

AT= x - Write to Selected S-Register

Result Codes

	OK		For all arguments.

AT? - Read Selected S-Register

Result Codes:

	OK		For all arguments.

A - Answer

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 =F1 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

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.)

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

Cn - Carrier Control

Result Codes:

	OK		n = 1.
	ERROR		Otherwise.

Dn - Dial

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.)

Dial Modifiers. 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 dialling only).

#

The 'gate' digit (tone dialling only).

A-D

DTMF digits A, B, C, and D. Some countries may prohibit sending of these digits during dialing.

J

Perform MNP 10 link negotiation at the highest supported speed (for this call only). (See *H.)

K

Enable power level adjustment during MNP 10 link negotiation (for this call only). (See )Mn.)

L

Re-dial last number: the modem will re-dial the last valid telephone number. The L must be immediately after the D with all the following characters ignored).

P

Select pulse dialling: pulse dial the numbers that follow until a "T" is encountered. Affects current and subsequent dialling. Some countries prevent changing dialling modes after the first digit is dialled.

T

Select tone dialling: tone dial the numbers that follow until a "P" is encountered. Affects current and subsequent dialling. Some countries prevent changing dialling modes after the first digit is dialled.

R

This command will be accepted, but not acted on.

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. Country requirements may limit the time imposed.

W

Wait for dial tone: the modem will wait for dial tone before dialling the digits following "W". If no dial tone is detected within the time specified by S7 (US models) or S6 (W-class models), 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 dialling 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.

^

Disable calling tone: applicable to current dial attempt only.

( )

Ignored: may be used to format the dial string.

-

Ignored: may be used to format the dial string.

<space>

Ignored: may be used to format the dial string.

<i>

Invalid character: will be ignored.

>

If enabled by country specific parameter, the modem will generate a grounding pulse on the EARTH relay output.

En - Command Echo

E0

Disables command echo.

E1

Enables command echo. (Default.)

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

Fn - Select Line Modulation

F0

Selects auto-detect mode . Sets N1 and sets S31 bit 1. In this mode, the modem configures for automode operation. All connect speeds supported by the modem are possible according to the remote modem's preference. The contents of S37 are ignored as is the sensed DTE speed.

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 Rockwell 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 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.22 bis 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.32 bis 4800 or V.32 4800 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.32 bis 7200 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.

This setting also allows connection at the Rockwell proprietary 7200 V.32 speed, e.g., with a RC9696/12 based modem.

F8

Selects V.32 bis 9600 or V.32 9600 as the only acceptable line modulations 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.32 bis 12000 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.

This setting also allows connection at the Rockwell proprietary 12000 V.32 speed, e.g., with a RC9696/12 based modem.

F10

Selects V.32 bis 14400 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 (Hang-Up)

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.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

In - Identification

I0

Reports product code (e.g., "14400").

I1

Reports pre-computed checksum from ROM (e.g., "007").

I2

Computes checksum and compares it with value stored in ROM. Reports result as OK or ERROR.

I3

Reports firmware revision (VX.XXX)-model code (A = 64K US, B = Reserved, C = 128K US, D = 128K W-Class, E = 64K W-Class), interface type (S = serial; P = parallel) , and MCU model (29 = C29; 39 = C39) (e.g., "V1.297-CS29").

I4

Reports OEM defined identifier string (e.g., "RC96ACL") in either Hayes-compatible binary format (default) or ASCII format (selectable by ConfigureACE).

I5

Reports Country Code parameter (e.g., "022").

I6

Reports modem data pump model and internal code revision (e.g, RC144DPL Rev CE).

Result Codes:

	OK		n = 0 to 6.
	ERROR		Otherwise.

Ln - Speaker Volume

L0

Low volume.

L1

Low volume. (Default.)

L2

Medium volume.

L3

High volume.

Result Codes:

	OK		n = 0 to 3.
	ERROR		Otherwise.

Mn - Speaker Control

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 dialling, but on during answering.

Result Codes:

	OK		n = 0 to 3.
	ERROR		Otherwise.

Nn - Automode Enable

N0 Automode detection is disabled. A subsequent handshake will be conducted according to the contents of S37 or, if S37 is zero, 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.)

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

On - Return to On-Line Data Mode

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.

Result Codes:

	OK		n = 0 or 1 and a connection exists.
	ERROR		Otherwise or if not connected.

P - Set Pulse Dial Default

As soon as a dial command is executed which explicitly specifies the dialling mode for that particular call (e.g., ATDT...), this command is overridden so that all future dialling will be tone dialled. (See T command.)

This command may not be permitted in some countries.

Result Code:

	OK

Qn - Quiet Results Codes Control

Q0

Enables result codes to the DTE. (Default.)

Q1

Disables result codes to the DTE.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

Sn - Read/Write S-Register

n

Establishes S-register n as the default register.

n=v

Sets S-register n to the value v.

n?

Reports the value of S-register n.

For example:

	ATS7	establishes S7 as the default register.
	ATS38	establishes S38 as the default register.
	AT=40	sets the contents of the default register to 40.
	ATS	sets the contents of S0 to 20.

In some cases, writing to the S register will appear to be accepted but the value will not actually be written.

Due to country restrictions, some commands will be accepted, but the value may be limited and replaced by a maximum or minimum value.

Minimum, maximum, and default values for S-registers may be altered with ConfigurACE.

T - Set Tone Dial Default

This command may not permitted in some countries. (See P.)

Result Code:

	OK

Vn - Result Code Form

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.)

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

Wn - Error Correction Message Control.

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.

Result Codes:

	OK		n = 0, 1, or 2.
	ERROR		Otherwise.

Xn - Extended Result Codes:

Blind dialling 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). Note that the information below is based upon the default implementation of the X results table. Table 3-1 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 otherwise by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, and NO ANSWER result codes. Blind dialling 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 otherwise by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX (XXXX = rate). Blind dialling 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 otherwise by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIALTONE, 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, and CONNECT XXXX. Blind dialling 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.)

Result Codes:

	OK		n = 0 to 4.
	ERROR		Otherwise.

Table 3-1. Result Codes

Short Form Long Form 	      |	    n Value in ATXn Command
------------------------------+-----------------------------------
				0	1	2	3	4
 0	 OK	 		x	x	x	x	x
 1	 CONNECT 		x	x	x	x	x
 2	 RING 			x	x	x	x	x
 3	 NO CARRIER		x 	x	x	x	x
 4	 ERROR	 		x	x	x	x	x
 5	 CONNECT 1200 		1	x	x 	x	x
 6	 NO DIALTONE  		3	3	x	x	x
 7	 BUSY	 		3	3	3	x	x
 8	 NO ANSWER		x	x	x 	x	x
 9	 CONNECT 0600		1	x	x	x	x
 10	 CONNECT 2400		1	x	x	x	x
 11	 CONNECT 4800	 	1	x	x	x	x
 12	 CONNECT 9600	 	1	x	x 	x	x
 13	 CONNECT 7200	 	1	x	x	x	x
 14	 CONNECT 12000 		1	x	x	x	x
 15	 CONNECT 14400 		1	x	x	x	x
 16	 CONNECT 19200 		1	x	x	x	x
 17	 CONNECT 38400 		1	x	x	x	x
 18	 CONNECT 57600 		1	x	x	x	x
 22	 CONNECT 1200TX/75RX 	1	x	x	x	x
 23	 CONNECT 75TX/1200RX 	1	x 	x	x	x
 24	 DELAYED 		4	4	4	4	x
 32	 BLACKLISTED 		4	4	4	4	x
 40	 CARRIER 300 		 				x
 44	 CARRIER 1200/75 	 	 			x
 45	 CARRIER 75/1200 	 	 			x
 46	 CARRIER 1200 		 				x
 47	 CARRIER 2400 		 				x
 48	 CARRIER 4800 		 				x
 49	 CARRIER 7200 		 				x
 50	 CARRIER 9600 		 				x
 51	 CARRIER 12000 		 				x
 52	 CARRIER 14400 		 				x
 66	 COMPRESSION: CLASS 5 	 	 	 		x
 67	 COMPRESSION: V.42 bis 	 	 	 		x
 69	 COMPRESSION: NONE 	 	 			x
 76	 PROTOCOL: NONE 	 	 			x
 77	 PROTOCOL: LAPM 	 	 			x
 80	 PROTOCOL: ALT 		 				x
 81	 PROTOCOL: ALT-CELLULAR  	 	 		x
 33	 FAX	 		x	x	x	x	x
 +F4	+FCERROR 		x	x	x	x	x
 35	 DATA	 		x	x	x	x	x

Note: An 'X' in a column indicates that the message (either the long
form if verbose, or the value only for short form) will be generated
when that particular value of 'n' (shown at the top of the column)
has been selected by the use of ATXn. If the column is blank, then
no message will be generated for that X option. A numeral indicates
which less explicit message (verbose or short form) will be output
for that X option. (Also, see Section 3.3).

Yn - Long Space Disconnect

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 (i.e., a break signal greater than 1.6 seconds) by going on-hook.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

Zn - Soft Reset and Restore Profile

Z0

Soft reset and restore stored profile 0.

Z1

Soft reset and restore stored profile 1.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

3.2.2. AT& Commands

&Cn - RLSD (DCD) Option

&C0

RLSD remains ON at all times. (Default.)

&C1

RLSD follows the state of the carrier.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

&Dn - DTR Option

&D0

DTR drop is interpreted according to the current &Q setting as follows: (Default.)

&Q0, &Q5, &Q6

DTR is ignored (assumed ON). Allows operation with DTEs which don't provide DTR.

&Q1, &Q4

DTR drop causes the modem to hang up. Auto-answer is not affected.

&Q2, &Q3

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, &Q1, &Q4, &Q5, &Q6

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, &Q3

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 through &Q6

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, &Q1, &Q4, &Q5, &Q6

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, &Q3

DTR drop causes the modem to hang up. Auto-answer is inhibited.

&F - Restore Factory Configuration (Profile)

&F Restore Factory Configuration

Result Codes:

	OK
	ERROR		If the modem is connected.

&Gn - Select Guard Tone

&G0

Disables guard tone. (Default for US models.)

&G1

Disables guard tone.

&G2

Selects 1800 Hz guard tone. (Default for W-class models.)

Result Codes:

	OK		n = 0 to 2.
	ERROR		Otherwise.

&Jn - Telephone Jack Control

&J0

&J0 command. (Default.)

&J1

&J1 command.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

&Kn - Flow Control

&K0

Disables flow control.

&K3

Enables RTS/CTS flow control. (Default for data modem modes.)

&K4

Enables XON/XOFF flow control.

Result Codes:

	OK		n = 0, 3, or 4.
	ERROR		Otherwise.

&Ln - Leased Line Operation

&L0

Selects dial-up line operation.

&L1

Selects leased line operation.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

&Mn - Asynchronous/Synchronous Mode Selection

&M0

Selects direct asynchronous operation. Note that the command sequence &M0\N0 selects normal buffered mode, but the command sequence \N0&M0 selects 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

Selects synchronous connect mode with async off-line command mode. The value 001b is written to S27 bits 3, 1, and 0, respectively.

&M2

Selects synchronous connect mode with async off-line command mode. Same as &M1 except that &M2 enables DTR dialling 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

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.

Result Codes:

	OK		n = 0 to 3.
	ERROR		Otherwise.

&Pn - Select Pulse Dial Make/Break Ratio

&P0

Selects 39%-61% make/break ratio at 10 pulses per second. (Default.)

&P1

Selects 33%-67% make/break ratio at 10 pulses per second.

&P2

Selects 39%-61% make/break ratio at 20 pulses per second.

&P3

Selects 33%-67% make/break ratio at 20 pulses per second.

Result Codes:

	OK		n = 0 to 3.
	ERROR		Otherwise.

&Qn - Sync/Async Mode

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. See &M0.

&Q1

Selects synchronous connect mode with async off-line command mode. See &M1.

&Q2

Selects synchronous connect mode with async off-line command mode. See &M2.

&Q4

Selects AutoSync operation. The value 100b is written to S27 bits 3, 1, and 0, respectively.

AutoSync operation, when used in conjunction with the Hayes Synchronous Interface (HSI) capability in the DTE, provides synchronous communication capability from an asynchronous terminal.

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.

Result Codes:

	OK		n = 0 to 6.
	ERROR		Otherwise.

&Rn - RTS/CTS Option

&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.25 bis handshake.

&R1

In sync mode, CTS is always ON (RTS transitions are ignored). In async mode, CTS will only drop if required by flow control. (Default.)

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

&Sn - DSR Override

&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.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

&Tn - Test and Diagnostics

&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 acknowledgment for remote request, i.e., an RDL request from a remote modem is allowed. Sets S23 bit 0. (Default.)

&T5

Disables digital loopback acknowledgment for remote request, i.e., an RDL request from a remote modem is denied. Clears S23 bit 0.

&T6

Requests a remote digital loopback (RDL), V.54 Loop 2, without self test. If no connection exists, ERROR is returned. Sets S16 bit 4 when the test is in progress. The CONNECT XXXX message is displayed upon the start of the test.

&T7

Requests a remote digital loopback (RDL) ,V.54 Loop 2, with self test. (In self test, a test pattern is looped back and checked by the modem.) If no connection exists, ERROR is returned. 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 5 when the test is in progress.

&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.

Result Code:

	OK

Example:

AT&V

ACTIVE PROFILE:

B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0 &K3 &Q5 &R1 &S0 &T4 &X0 &Y0
S00:002 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:030 S08:002 S09:006
S10:014 S11:255 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:020 S46:138
S48:007 S95:000

STORED PROFILE 0:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0 &K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000

STORED PROFILE 1:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0 &K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000

TELEPHONE NUMBERS:
0 =  1 =
2 =  3 =


OK

NVRAM FAILED OR NOT INSTALLED

&Wn - Store Current Configuration

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.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

&Xn - Select Synchronous Clock Source

In asynchronous mode, the transmit and receive clocks are turned OFF. In synchronous mode, the clocks are turned ON with the frequency of 1200 Hz or faster corresponding to the speed that is selected for modem operation.

&X0

Selects internal timing. The modem generates the transmit clock signal and applies it to the TXCLK output at the serial interface.

&X1

Selects external timing. The local DTE sources the transmit clock signal on the XTCLK input of the serial interface. The modem applies this clock to the TXCLK output at the serial interface.

&X2

Selects slave receive timing. The modem derives the transmit clock signal from the incoming carrier and applies it to the TXCLK output at the serial interface.

Result Codes:

	OK		n = 0 to 2.
	ERROR		Otherwise.

&Yn - Designate a Default Reset Profile

&Y0

The modem will use profile 0.

&Y1

The modem will use profile 1.

Result Codes:

	OK		n = 0 to 1.
	ERROR		Otherwise.

&Zn=x - Store telephone number

&Zn=x

n = 0 to 3 (US) and x = dial string. (Requires 256-byte NVRAM.)

&Zn=x

n = 0 to 19 (W-class) and x = dial string. (Requires 2048-byte NVRAM.)

Result Codes:

	OK		For n = 0 to 3 (US) or 19 (W-class), and x
			less than or equal to 45 digits.
	ERROR		If n > 3 (US) or 19 (W-class), or x
			greater than 45 digits.

3.2.3. AT% Commands

%En - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward

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. (Not applicable to RC96V24AC or RC14V24AC.)

%E3

Enable line quality monitor and auto-retrain, but hang-up immediately when EQM reaches hang-up threshhold (fast hang-up).

Result Codes:

	OK		n = 0, 1, or 2.
	ERROR		Otherwise.

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.

%L - Line Signal Level

Result Codes:

	OK

%Q - Line Signal Quality

Example:

	AT%Q
	015

Result Codes:

	OK		If connected.
	ERROR		If not connected, or connected in 300 bps,
			V.23, or fax modes.

%TTn - PTT Testing Utilities

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 upon 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 1 mark (originate) symbol.

%TT11

V.21 channel 2 mark symbol.

%TT12

V.23 backward channel mark symbol.

%TT13

V.23 forward channel mark symbol.

%TT14

V.22 originate (call mark) signalling at 600 bps.

%TT15

V.22 originate (call mark) signalling at 1200 bps.

%TT16

V.22 bis originate (call mark) signalling at 2400 bps.

%TT17

V.22 answer signalling (guard tone if PTT required).

%TT18

V.22 bis answer signalling (guard tone if required).

%TT19

V.21 channel 1 space symbol.

%TT20

V.32 9600 bps.

%TT21

V.32 bis 14400 bps.

%TT1A

V.21 channel 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.23 channel 2

%TT41

V.27 ter 2400 bps

%TT42

V.27 ter 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

\Gn - Modem-to-Modem Flow Control (XON/XOFF)

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.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

\Kn - Break Control

The response is different in 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.)

\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.)

\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 that when S82 is modified, the modem converts the Hayes specific value to the \K format and updates S40 to match.

Result Codes:

	OK		n = 0 to 5.
	ERROR		Otherwise.

\Nn - Operating Mode

\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 a 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.)

\N4

Selects LAPM error-correction mode. Failure to make an 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.)

Result Codes:

	OK		n = 0 to 5.
	ERROR		Otherwise.

3.3. ERROR DETECTION AND DATA COMPRESSION COMMANDS

3.3.1. AT% Commands

%C - Enable/Disable Data Compression

%C0

Disables data compression. Resets S46 bit 1.

%C1

Enables MNP 5 data compression negotiation. Resets S46 bit 1.

%C2

Enables V.42 bis data compression. Sets S46 bit 1.

%C3

Enables both V.42 bis and MNP 5 data compression. Sets S46 bit 1. (Default.)

Result Codes:

	OK		n = 0, 1, 2, or 3.
	ERROR		Otherwise.

3.3.2. AT\ Commands

\An - Select Maximum MNP Block Size

\A0

64 characters.

\A1

128 characters. (Default.)

\A2

192 characters.

\A3

256 characters.

Result Codes:

	OK		n = 0 to 3.
	ERROR		Otherwise.

\Bn - Transmit Break to Remote

In error correction mode, the modem will signal a 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.)

Result Codes:

	OK		If connected in data modem mode.
	NO CARRIER	If not connected or connected in fax modem mode.

Note: When the modem receives a break from the remote modem, break is passed to the DTE as follows: In non-error correction mode direct, the length is passed; in non-error correction mode normal,

\Ln - MNP Block/Stream Mode Select

\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.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

3.4. MNP 10 COMMANDS

3.4.1. AT) Commands

)Mn - Enable Cellular Power Level Adjustment

)M0

Disables power level adjustment during MNP 10 link negotiation. (Default.)

)M1

Enables power level adjustment during MNP 10 link negotiation.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

3.4.2. AT- Commands

*Hn - Link Negotiation Speed

*H0

Link negotiation occurs at the highest supported speed. (Default.)

*H1

Link negotiation occurs at 1200 bps.

*H2

Link negotiation occurs at 4800 bps.

Result Codes:

	OK		n = 0 to 2.
	ERROR		Otherwise.

-Kn - MNP Extended Services

-K0

Disables V.42 LAPM to MNP 10 conversion.

-K1

Enables V.42 LAPM to MNP 10 conversion. (Default.)

-K2

Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended Services initiation during V.42 LAPM answer mode detection phase.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

-Qn - Enable Fallback to V.22 bis/V.22

-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.)

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

@Mn - Initial Cellular Power Level Setting

@M0

-26 dBm (Default.)

@M1

-30 dBm

@M2

-10 dBm

@M3 - @M10

-10 dBm

@M11

-11 dBm

@M12

-12 dBm

...

@M30

-30 dBm

@M31

-31 dBm

Result Codes:

	OK		n = 0 to 31.
	ERROR		Otherwise.

:E - Compromise Equalizer Enable Command

:E0

Disables the equalizer

:E1

Enables the equalizer (Default)

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

3.5. W-CLASS COMMANDS

3.5.1. AT% Commands

%Fn - Split-Speed Direction Select

%F1

Selects 75Tx/1200Rx. Resets S28 bits 1 and 2. (Default.)

%F2

Selects 1200Tx/75Rx. Sets S28 bit 1 and resets S28 bit 2.

%Mn - AUXCTL Output Line Control

%M0

Sets the AUXCTL line low. The line will go high when the modem enters data mode if synchronous is selected.(i.e., for modes &M1, &M2, or &M3). The line will return low at the end of data mode. (Default.)

%M1

Sets the AUXCTL line high. The line will go low when the modem enters data mode and will return high when the data mode terminates and the command mode is entered.

Result Codes:

3.5.2. AT* Commands

*B - Display Blacklisted Numbers

Example:

	 NO. - PHONE NUMBER -
	 ------ ------------------------------
	 1;	4175537660
	 2;	8288924961
	 3;	3887278862
	 4;	3124839442
	 5;	6284664

	 OK

*C - Remote Configuration Password

* D - Display Delayed Numbers

Example:

	 NO. - PHONE NUMBER -DELAY
	 ------ -------------------------------------------
	 1;	8264734660 2:00:00
	 2;	7532634661 2:00:00
	 3;	2587334662 0:02:00
	 4;	7532651663 0:03:25
	 5;	7459931664 0:01:45

	 OK

*E - Exit Remote Configuration Mode

*L - Display Secure Access (Callback) Directory.

Format:

Example:

	0-MERAS02 (Password entered; no callback number)
	1-872FRD:345-7895551212 (Password entered; callback number)
	2-
	3-
	4-
	5-
	6-
	7-
	8-
	9-
	10
	11-
	12-
	13-
	14-
	15-
	16-
	17-
	18-
	19-

	OK

*NCnn - Country Select

Note: Automatic DAA country code recognition is enabled by the NC0 command (the 0 country code is reserved for this function). Automatic DAA country code recognition is disabled when by the NCnn command selecting any other valid country code.

	Country Code (nn)

	Australia 40
	Austria 1
	Belgium 2
	Canada 20
	Denmark 3
	Finland 4
	France 5
	Germany 6
	Greece 17
	Ireland 7
	Israel 18
	Italy 8
	Japan 43
	Luxembourg 9
	Mexico 21
	Netherlands 10
	New Zealand 48
	Norway 11
	Portugal 12
	Singapore 47
	Spain 13
	Sweden 14
	Switzerland 15
	United Kingdom 16
	United States 22

Result Codes:

	OK		If parameters corresponding to entered country
			code are present in EPROM.
	ERROR		Otherwise.

*P - Store Callback Password

AT*Pn: <password>:<number to be dialled back>

Parameters: 0 to 19.

Result Codes:

	OK		For parameters 0 to n and for dial
			string of less than 41 digits.
	ERROR		Otherwise.

*R - Request Remote Configuration Mode

Following a successful request, indicated by the display of the !AT prompt by the local DTE, the local DTE may send commands to the remote modem. These commands, a subset of the normal commands available, should be entered without the 'AT' header. Some commands are prohibited and others may produce unpredictable results. To exit the remote configuration mode, enter the *E command or the escape sequence defined by register S202. The default password is QWERTY. (Also, see * C and * E commands and register S202.)

*Zn - Change Dial Codes:

*Z0

Use dial code 0. (Default.)

*Z1

Use dial code 1.

Result Codes:

3.5.3. AT\ Commands

\F - Display Telephone Directory

\S - Report Active Configuration

Example:

	CMD DESCRIPTION / OPTION
	--- ---------------------
	 DTE BPS 2400
	 DTE PARITY 8NONE
	 DIAL MODE PULSE
	 LINE SPEED NONE
	B BELL MODE OFF
	E CMD ECHO ON
	F LINE MODE AUTO
	L SPKR VOLUME LOW
	M SPKR CONTROL 1
	N AUTO MODE OFF
	Q QUIET ON
	V RESULT FORM LONG
	W EC MESG 0
	X EXT RESULTS 4
	Y LONG SPACE DISC YES
	%C COMPRESSION BOTH
	%E AUTO RETRAIN OFF
		-K EXT. SERVICES OFF


	CMD DESCRIPTION / OPTION
	--- ---------------------
	&C DCD OPTION 0
	&D DTR OPTION 0
	&G GUARD TONE NONE
	&K FLOW CONTROL NONE
	&P PULSE MODE 0
	&Q ASYNC/SYNC 0
	&R RTS/CTS 0
	&S DSR OPT 0
	&T ENABLE RDL YES
	&X SYNC CLOCK  INT
	&Y PROFILE NVM 0
	\A MAX BLK SIZE 64
	\G REMOTE FLOW ON
	\K BRK OPT 2
	\N ECL MODE  NORM
	\W SPLIT SPEED OFF
	*H NEG. SPEED HIGH
	)M CELLULAR OFF

	CMD DESCRIPTION / OPTION
	--- ---------------------
	S0 RINGS TO ANS 002
	S1 RING COUNT 000
	S2 <ESC> CHAR 043
	S3 <CR> CHAR 013
	S4 <LF> CHAR 010
	S5 <BS> CHAR 008
	S8 PAUSE TIME 001
	S12 ESC GUARD TIME 050
	S18 TEST TIME 000
	S24 SLEEP INACT 000
	S30 CONNECT INACT 000
	S32 <XON> CHAR 017
	S33 <XOFF> CHAR 019
	S36 FALLBACK ACTION 000
	S37 MODE SELECT 000
	S38 V.42 NEG. CTRL 000
	S48 V42 NEG CTRL 128
	S95 RES. CODE 000

	OK

\Wn - Split-Speed Operation

\W0

Disables split-speed mode. (Default.)

\W1

Enables split-speed mode. V.23 operation is also forced as though F3 had been entered. Note that %Fn command determines the split screen direction.

Result Codes:

	OK		n = 0 or 1.
	ERROR		Otherwise.

3.6. CALLER ID COMMANDS

3.6.1. AT#CID Command

#CIDn - Caller ID

#CID=0

Disables Caller ID. (Default.)

#CID=1

Enables Caller ID with formatted presentation to the DTE. The modem will present the data items in a <Tag><Value> pair format. The expected pairs are data, time, caller code (telephone number), and name.

#CID=2

Enables Caller ID with unformatted presentation to the DTE. The modem will present the entire packet of information, excluding the leading U's, in ASCII printable hex numbers.

Result Codes:

	OK		n = 0 or 2.
	ERROR		Otherwise.

Inquiries

#CID?

Retrieves the current Caller ID mode from the modem.

#CID=?

Returns the mode capabilities of the modem in a list with each element separated by commas.

Formatted Form Reporting

DATE

DATE = MMDD where MM is the month number (01 to 12) and DD is the day number (01..31).

TIME

TIME = HHMM where HH is the hour number (00 to 23) and MM is the minute number (00 to 59).

NMBR

NMBR = <number> or P or O where <number> is the telephone number of the caller, where P indicates that the calling number information is not available since the originating caller has requested private service, and where O indicates that the calling number information is not available or out of service at the calling location.

NAME

NAME = <listing name> where <listing name> is the subscription name.

MESG

MESG = <data tag> <length of message> <data> <checksum> in printable ASCII hex numbers. This tag indicates a data item not listed above. The message is only possible for Multiple Message Format.

Notes:

1. The modem does not present any Caller ID information if the DCE detects a checksum error in the Caller ID packet.
2. In the event of an unrecognized data tag, the modem will present the data in ASCII hex numbers following the MESG tag.

Example of Formatted Form Reporting

	RING

	DATE = 0321
	TIME = 1405
	NMBR = 5045551234
	NAME = A N OTHER

	RING

	RING

	RING

	MESG = 060342424231

	RING

	RING

Unformatted Form Reporting

The modem does not detect the checksum of the packet.

Example of Unformatted Form Reporting

	RING

	0412303332323234303539313435353132333435

	RING

	RING

3.7. AT COMMAND RESULT CODES

Two forms of each result code are available: long-form, an English-like "verbose" response, and short-form, a data-like numeric response (included in parentheses following the long-form). The long-form code is preceded and terminated by the sequence < CR> < LF>. The short-form is terminated by < CR>, only with no preceding sequence.

If result messages are suppressed, nothing is returned to the DTE. The long-form results codes can be modified by the OEM through the ConfigurACE Configuration Utility Program. (See ConfigurACE description.)

00- OK

The OK code is returned by the modem to acknowledge execution of a command line.

01- CONNECT

The modem will send this result code upon connecting when:

1. The line speed is 300 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
2. The DTE speed is 300 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting, or
3. The range of result code responses is restricted by the X command such that no speed reporting is allowed.

02- RING

The modem sends this result code when incoming ringing is detected on the line. What qualifies as a ring signal is determined by country-dependent parameters, modifiable through ConfigurACE.

03- NO CARRIER

The modem sends this result code when attempting to establish a call if:

1. Ringback is detected and later ceases but no carrier is detected within the period of time determined by register S7, or
2. No ringback is detected within the period of time determined by register S7.

This result code is also used when the modem auto-disconnects due to loss of carrier.

Under X0, if busy tone detection is enforced, this result code is used as a response to the detection of busy or circuit busy. Under X0, if dial tone detection is enforced or selected, this result code is used to indicate that dial tone has not been detected.

04- ERROR

The modem returns this result code if the command line contains a syntax error or it is unable to execute a command contained in the command line. It is issued if a command does not exist or if the parameter supplied is outside the permitted range.

Under X0, X1, X2, and X3, this result is used instead of DELAYED and BLACKLISTED.

05- CONNECT 1200

For X1, X2, X3, and X4, the modem sends this result code when:

1. The line speed is 1200 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
2. The DTE speed is 1200 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

(Also, see the W command.)

06- NO DIALTONE

For X2 and X4, the modem sends this result code if it has been instructed to wait for dial tone during dialling but none is received.

07- BUSY

For X3 and X4, if busy tone detection is enforced, the modem sends this result code when attempting to originate a call if the busy (engaged) signal is detected on the line.

08- NO ANSWER

The modem sends this result code when attempting to originate a call if a continuous ringback signal is detected on the line until the expiration of the timer S7.

09- CONNECT 0600

For X1, X2, X3, and X4, the modem sends this result code when:

1. The line speed is 600 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
2. The DTE speed is 600 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

10- CONNECT 2400

For X1, X2, X3, and X4, the modem sends this result code when:

1. The line speed is 2400 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
2. The DTE speed is 2400 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

11- CONNECT 4800

For X1, X2, X3, and X4, the modem sends this result code when the DTE speed is 4800 bps and the modem has been instructed to report the DTE speed upon connecting.

12- CONNECT 9600

For X1, X2, X3, and X4, the modem sends this result code upon connecting when the DTE speed is 9600 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

13- CONNECT 7200

For X1, X2, X3, and X4, the modem sends this result code upon connecting when the DTE speed is 7200 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

14- CONNECT 12000

For X1, X2, X3, and X4, the modem sends this result code upon connecting when the DTE speed is 12000 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

15- CONNECT 14400

For X1, X2, X3, and X4, the modem sends this result code upon connecting when the DTE speed is 14400 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

16- CONNECT 19200

For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 19,200 bps and the modem has been instructed to report the DTE speed upon connecting.

17- CONNECT 38400

For X1, X2, X3, and X4, the modem sends this result code upon connecting when the DTE speed is 38400 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

18- CONNECT 57600

For X1, X2, X3, and X4, the modem sends this result code upon connecting when the DTE speed is 57600 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

22- CONNECT 75TX/1200RX

For X1, X2, X3, and X4, the modem returns this result code upon establishing a V.23 originate connection when the modem has been instructed to report the DCE speed upon connection.

23- CONNECT 1200TX/75RX

For X1, X2, X3, and X4, the modem returns this result code upon establishing a V.23 answer connection when the modem has been instructed to report the DCE speed upon connection.

24- DELAYED

For X4, the modem returns this result code when a call fails to connect and the number dialled is considered 'delayed' due to country blacklisting requirements.

32- BLACKLISTED

For X4, the modem returns this result code when a call fails to connect and the number dialled is considered 'blacklisted'.

33- FAX

The modem returns this result code when a fax modem connection is established in a facsimile mode.

35- DATA

The modem returns this result code when a data modem connection is established in a facsimile mode.

40- CARRIER 300

The modem returns this result code when either a V.21 or Bell 103 carrier has been detected on the line and carrier reporting has been enabled. (See S95.)

44- CARRIER 1200/75

The modem sends this result code when the V.23 backward channel carrier has been detected on the line and carrier reporting has been enabled. (See S95 and X4.)

45- CARRIER 75/1200

The modem sends this result code when the V.23 forward channel carrier has been detected on the line and carrier reporting has been enabled. (See S95 and X4.)

46- CARRIER 1200

The modem sends this result code when either the high or low channel carrier in either V.22 or Bell 212 mode has been detected on the line and carrier reporting has been enabled. (See S95 and X4.)

47- CARRIER 2400

The modem sends this result code when either the high or low channel carrier in V.22 bis mode has been detected on the line, and carrier reporting has been enabled. (See S95 and X4.)

48- CARRIER 4800

The modem sends this result code when the 4800 bps data rate in V.32 bis or V.32 mode has been detected on the line, and carrier reporting has been enabled. (See S95 and X4.)

49- CARRIER 7200

The modem sends this result code when the 7200 bps data rate in V.32 bis mode has been detected on the line, and carrier reporting has been enabled. (See S95 and X4.)

50- CARRIER 9600

The modem sends this result code when the 9600 bps data rate in V.32 bis or V.32 mode has been detected on the line, and carrier reporting has been enabled. (See S95 and X4.)

51- CARRIER 12000

The modem sends this result code when the 12000 bps data rate in V.32 bis mode has been detected on the line, and carrier reporting has been enabled. (See S95 and X4.)

52- CARRIER 14400

The modem sends this result code when the 14400 bps data rate in V.32 bis mode has been detected on the line, and carrier reporting has been enabled. (See S95 and X4.)

66- COMPRESSION: CLASS 5

This message is sent to the DTE when the modem has connected in MNP Class 5 and COMPRESSION message reporting has been enabled. (See S95 and X4.)

67- COMPRESSION: V.42 bis

This message is sent to the DTE when the modem has connected in V.42 bis and COMPRESSION message reporting has been enabled. (See S95 and X4.)

69- COMPRESSION: NONE

This message is sent to the DTE when the modem has connected without data compression and COMPRESSION message reporting has been enabled. (See S95 and X4.)

70- PROTOCOL: NONE

This message is sent to the DTE when the modem has connected without any form of error correction, and the PROTOCOL message reporting has been enabled. (See S95 and X4.)

77- PROTOCOL: LAPM

This message is sent to the DTE when the modem has connected in the V.42 LAPM mode of error correction, and PROTOCOL message reporting has been enabled. (See S95 and X4.)

80- PROTOCOL: ALT

This message is sent to the DTE when the modem has connected in the MNP mode of error correction, and PROTOCOL message reporting has been enabled. (See S95 and X4.)

81- PROTOCOL: ALT-CELLULAR

This message is sent to the DTE when the modem has connected in the MNP 10 mode, and PROTOCOL message reporting has been enabled. (See S95 and X4.)

+FC- FCERROR

This message is sent to the DTE when the modem has detected an error in fax class 1 or fax class 2 mode.

4. S REGISTERS

All bit-mapped registers are read-only. The appropriate AT command which controls the relevant bits in the S-register should be used to change the value.

4.1. FACTORY DEFAULTS

The defaults shown are those used by Rockwell in factory profiles zero and one. These may be overwritten by the OEM with ConfigurACE prior to placing the firmware in PROM. Minimum and maximum values may also be imposed by ConfigurACE in response to country PTT requirements.

The default values shown in Table 4-1 may vary by modem firmware configuration. Consult the MCU firmware release notes for exact configuration.

All of the factory default values may be loaded at any time by entering the &F command.

Table 4-1. S Register Summary

Register Function			Range	Units	Save	Default
S0	 Rings to Auto-Answer		0-255	rings	*	0 (US models)
								2 (W-class models)
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	s	*	2 (US models)	
								4 (W-class models)
S7	 Wait Time for Carrier		1-255	s	*	50
S8	 Pause Time for Dial Delay Modifier 0-255 s	*	2
S9	 Carrier Detect Response Time	1-255	0.1 s	*	6
S10	 Carrier Loss Disconnect Time	1-255 	0.1 s	*	14
S11	 DTMF Tone Duration		50-255	0.001 s	*	95
S12	 Escape Code Guard Time		0-255	0.02 s	*	50
S13	 Reserved			-	-		-	
S14	 General Bit Mapped Options	-	-	*	138 (8Ah)
S15	 Reserved			-	-		-
S16	 Test Mode Bit Mapped Options (&T)	-	-		0
S17	 Reserved			-	-		-
S18	 Test Timer			0-255	s	*	0
S19-S20  Reserved			-	-		-
S21	 V.24/General Bit Mapped Options -	-	*	4 (04h)
S22	 Speaker/Results Bit Mapped Options -	-	*	117 (75h)
S23	 General Bit Mapped Options		-	*	55 (37h) (US models)
								183 (B7h) (W-class models)
S24	 Sleep Inactivity Timer		0-255	s	*	0
S25	 Delay to DTR Off		0-255	s or 0.01 s	5
S26	 RTS-to-CTS Delay		0-255	0.01 s		1	
S27	 General Bit Mapped Options	-	-	*	73 (49h) (US models with ECC)
								74 (4Ah) (US models w/o ECC)
								9 (09h) (W-class models )
S28	 General Bit-Mapped Options	- 	-	*	0	
S29	 Flash Dial Modifier Time	0-255	10 ms		0	
S30	 Disconnect Inactivity Timer	0-255	10 s		0
S31	 General Bit-Mapped Options	- 	-	*	2
S32	 XON Character			0-255	ASCII		17 (11h)	
S33	 XOFF Character			0-255	ASCII		19 (13h)	
S34-S35  Reserved			-	-		-
S36	 LAPM Failure Control		-	-	*	7
S37	 Line Connection Speed		-	-	*	0
S38	 Delay Before Forced Hangup	0-255	s		20
S39	 Flow Control			-	-	*	3
S40	 General Bit-Mapped Options	-	-	*	105 (69h) (Non-MNP 10 models)
								107(6Bh) (MNP 10 models)
S41	 General Bit-Mapped Options	-	-	*	3
S42-S45	 Reserved			-	-		-
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 0-15	dBm		10
S92	 Fax Transmit Attenuation Level	0-15	dBm		10
S95	 Result Code Messages Control	-	-	*	0
S99	 Leased Line Transmit Level	0-15	-dBm		10
S201	 Cellular Transmit Level	0-63		*	58
S202	 Remote Access Escape Character	0-255	ASCII	*	170

4.2. S REGISTER DEFINITIONS

S0 - Number of Rings to Auto-Answer

Range:

Default:

S1 - Ring Counter

Range:

Default:

S2 - Escape Character

Range:

Default:

S3 - Carriage Return Character

Range:

Default:

S4 - Line Feed Character

Range:

Default:

S5 - Backspace Character

Range:

Default:

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, that 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.

Range:

Default:

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 the modem will wait for dial tone when encountering a "W" dial modifier before continuing with the next dial string parameter.

Range:

Default:

S8 - Pause Time For Dial Delay

Range:

Default:

S9 - Carrier Detect Response Time

Range:

Default:

S10 - Lost Carrier To Hang Up Delay

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:

Default:

S11 - DTMF Tone Duration

For W-class models, this parameter is a country parameter loaded by ConfigurACE.

Range:

Default:

S12 - Escape Code Guard Time

Range:

Default:

S13 - Reserved

S14 - General Bit Mapped Options

Default:

	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.)

S15 - Reserved

S16 - General Bit Mapped Test Options

Default:

	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

S17 - Reserved

S18 - Test Timer

Range:

Default:

S19 - AutoSync Registers

Default:

	Bit 0		- Reserved
	Bit 1 		- BSC/HDLC format select
		0 		BSC selected
		1 		HDLC selected
	Bit 2 		- Address detection enable/disable
		0 		DIsabled
		1 		Enabled
	Bit 3 		- NRZI/NZI coding select
		0 		NRZI
		1 		NZI
	Bit 4 		- Idle indicator select select
		0 		Mark idle
		1 		Flag or sync idle
	Bit 5 - 7 	- Reserved

S20 - AutoSync HDLC Address or BSC Sync Character

Range:

Default:

S21 - V.21/General Bit Mapped Options

Default:

	Bit 0 		- Set by &Jn command but ignored otherwise.
		0 		&J0 (Default.)
		1 		&J1
	Bit 1 		- Reserved
	Bit 2 		- CTS behavior (&Rn)
		0 		CTS always on (&R0)
		1 		CTS tracks RTS (&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

S22 - Speaker/Results Bit Mapped Options

Default:

	Bit 0,1 	- Speaker volume (Ln)
		0 		Off (L0)
		1 		Low (L1) (Default.)
		2 		Medium (L2)
		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

S23 - General Bit Mapped Options

Default:

	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.)

S24 - Sleep Inactivity Timer

Range:

Default:

S25 - Delay To DTR

Range:

Default:

S26 - RTS to CTS Delay

Range:

Default:

S27 - Bit Mapped Option

Default:

	Bit 0,1,3 	- Synchronous/asynchronous 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

S28 - Bit Mapped Options

Default:

S29 - Flash Dial Modifier Time

Range:

Default:

S30 - Disconnect Inactivity Timer

Range:

Default:

S31 - Bit Mapped Options

Default:

	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

S32 - XON Character

Range:

Default:

S33 - XOFF Character

Range:

Default:

S34-S35 - Reserved

S36 - LAPM Failure Control (Applies to ECC Models Only)

Default:

	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

S37 - Desired Line Connection Speed

Default:

	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

S38 - Delay Before Forced Hang Up

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:

Default:

S39 - Flow Control

Default:

	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

S40 - General Bit Mapped Options

Default:

	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)
	Bits 3-5 	- Break Handling (\Kn)
		0 		\K0
		1 		\K1
		2 		\K2
		3 		\K3
		4 		\K4
		5 		\K5 (Default.)
	Bits 6-7 	- MNP block size (\An)
		0 		64 chars (\A0)
		1 		128 chars (\A1) (Default.)
		2 		192 chars (\A2)
		3 		256 chars (\A3)

S41 - General Bit Mapped Options

Default:

	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 		Retrain 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.22bis/V.22 (-Qn) [High Speed]
		0 		Disabled (-Q0)
		1 		Enabled (-Q1) (Default.)

S46 - Data Compression Control

Range:

Default:

	S46=136		Execute error correction protocol with no compression.
	S46=138		Execute error correction protocol with compression. (Default.)

S48 - V.42 Negotiation Action

Range:

Default:

	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.

S80 - Soft-Switch Functions

Default:

	Bits 0-4 	- Reserved
	Bit 5 		- V.25 bis/AT command mode select (AT/V25B signal)
		0 		AT selected
		1 		V.25 bis 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

S82 - Break Handling Options

Range:

Default:

	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

Range:

Default:

	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

Range:

Default:

S92 - Fax Transmit Attenuation Level

Range:

Default:

S95 - Extended Result Codes

Default:

	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 3-1).
	Bit 2 		Enable CARRIER XXXX result code (XXXX = rate;
			see Table 3-1).
	Bit 3 		Enable PROTOCOL XXXX result code (XXXX = protocol
			identifier; see Table 3-1).
	Bit 4 		Reserved.
	Bit 5 		Enable COMPRESSION result code (XXXX = compression
			type; see Table 3-1).
	Bit 6 		Reserved.
	Bit 7 		Reserved.

S99 - Leased Line Transmit Level

Range:

Default:

S201 - Cellular Transmit Level

Default:

	Bits 0 - 4 	Initial Cellular Power Level Setting (@Mn)
	Bit 5 		Compromise Equalizer Enable Command (:En)
	Bit 6 		Reserved.
	Bit 7 		Reserved.

S202 - Remote Access Escape Character

Range:

Default:

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 '*' 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 2 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 mode 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.

5. V.25 BIS COMMAND SET

COMMAND:

An instruction issued by the DTE to the modem as part of the automatic calling procedure.

INDICATION:

A response message issued by the modem to the DTE as part of the automatic calling procedure.

PARAMETER:

A variable which may accompany commands or indications. In general, more than one parameter may be used in a command or indication.

5.1. DTE/DCE INTERCHANGE CIRCUITS

The DTE is the 'master' and the modem is the 'slave'. Only the DTE initiates V.25 bis communications, while the modem just responds.

When the modem is in data transfer mode after the connection has been established, the modem is no longer in V.25 bis mode.

During automatic calling and answering procedures, RLSD (CT109) follows the condition of RTS (CT106).

5.2. FORMATS FOR COMMANDS AND INDICATIONS

5.2.1. Synchronous Signalling

HDLC Frames

FLAG

7Eh

ADDRESS

FFh

CONTROL

13h

MESSAGE Data

Must be an integer number of 8-bit characters between 3 and 60.

FCS

Sixteen-bit cyclic redundancy check based on the polynomial: X16 + X12 + X5 + X1

Framing Rules

A frame with an address, control, or FCS field error is invalid. A frame with more than 60 characters in the message field is invalid. A frame with 3 or less characters in the message field is rejected with the INV indication.

Invalid frames are ignored.

For every valid command frame received, the modem responds with exactly one indication if the connection is not completed, and no indication if the connection is completed.

When the modem receives a valid command frame, it will ignore another command frame until it has completed sending its indication back to the attached DTE, or until the connection is terminated, whichever occurs last.

The modem can accept a valid command frame that follows an invalid frame if there is a pause of at least 2 bit times between the end of the invalid frame and the start of the valid frame.

The modem automatically detects whether each command frame is NRZ or NRZI encoded and follows suit for its indication.

Command and indication frames contain inserted zero bits as required by HDLC. The receiving entity (modem or DTE) strips out these extra bits.

BSC Frames

SYN

16h

STX

02h

MESSAGE Data

Must be an integer number of 8-bit characters between 3 and 60.

ETX

83h

Framing Rules

A frame with a parity error is invalid. A frame with more than 60 characters in the message field is invalid. A frame with 3 or less characters in the message field is invalid. An invalid frame will be rejected with the INV indication.

For every valid command frame received, the modem responds with exactly one indication if the connection is not completed, and no indication if the connection is completed. The modem does not recognize or send any of the short 'ack' type messages used in character oriented protocols.

When the modem receives a valid command frame, it will ignore another command frame until it has completed sending its indication back to the attached DTE, or until the connection is terminated, whichever occurs last.

The modem can accept a valid command frame that follows an invalid frame if there is a pause of at least 2-bit times between the end of the invalid frame and the start of the valid frame.

5.2.2. Asynchronous Signalling

	MESSAGE <CR> <LF>

The message field can contain between 3 and 60 8-bit characters (7-bit IA5 per T.50 plus odd parity per V.4) which define the parameters. Each frame can contain only one command followed by multiple parameters as will fill the limit.

Command/Indication Exchange Protocol

A command received with a message field of less than 3 characters or more than 60 characters is regarded as an error in the message and will result in the negative acknowledgment of the command by the return of the invalid message (INV).

DTE Adaption

In HDLC mode, the modem detects when DTE sends in NRZ or NRZI format, and adjusts its indication format accordingly.

5.2.3. V.25 bis Escape Code Sequence

5.3. STANDARD V.25 BIS COMMANDS

CIC - Connect Incoming Call

CRI - Call Request with Number and Identification

x..x Dial string:

a string of dial characters (see CRN).

; Separator:

inserted between dial string and identification.

Example:

	CRN 234-1234;4567
	VAL

CRN - Call Request with Number

0-9

Digits 0 to 9.

*

The 'star' digit: Tone dialling only.

#

The 'gate' digit: Tone dialling only.

T

Select tone dialling: Affects current and subsequent dialling.

P

Select pulse dialling: Affects current and subsequent dialling.

<

Short dial pause: Period controlled by S8: The modem will pause before dialling the digits following "<."

=

Long dial pause: Period twice as long as the short dial pause.

:

Wait for dial tone: The modem will wait for dial tone before dialling the digits following ":".

&

Flash: The modem will go off-line according to the value of S30.

^

Disable calling tone transmission: Applicable to current dial attempt only.

Example:

	CRN 234-1234
	VAL

CRS - Call Request with Memory Address

0-19

Dial string memory address.

Example:

	CRS 1 or CRS1
	345-5678
	VAL

DIC - Disregard Incoming Call

PRI - Program Identification

PRN - Program Number

0-19

Dial string memory address.

;

Separator: Inserted between dial string memory address and dial string.

x..x

Dial string: A string of dial characters: 0-9 * # T P = &: /: characters accepted: An empty string clears the identification memory referenced.

Example:

	PRN 1;345-5678
	VAL

RLD - List Request of Delayed Call Numbers

Example:

	NO.  - PHONE NUMBER - DELAY
	----- ----------------------
	LSD 1;   7503857609     2
	LSD 2;   1349579050     1
	LSD 3;   4146949385     1
	LSD 4;   3479784564     3
	LSD 5;   5529685740     1
	VAL

RLF - List Request of Forbidden Numbers

Example:

	NO.  - PHONE NUMBER
	----- ----------------------
	LSF 1; 6209567485
	LSF 2; 4227458945
	LSF 3; 2137874644
	LSF 4; 5256677014
	LSF 5; 0114418172323
	LSF 6; 7228309
	VAL

RLI - List Request of Identification Numbers

Example:

	LSI 1; 8183400
	VAL

RLN - List Request of Stored Numbers (Dial Strings)

0-19

Dial string memory address: If no address is supplied, a full list of all stored dial strings will be returned.

Examples:

Response to RLN4
	LSN 4; 19:1=722340
	VAL

Response to RLN
	LSN 0;
	LSN 1;
	LSN 2;
	LSN 3;19:1=7223400
	LSN 4;
	LSN 5;
	LSN 6;
	LSN 7;
	LSN 8;93256642
	LSN 9;
	LSN10;
	LSN11;
	LSN12;
	LSN13;
	LSN14;
	LSN15;
	LSN16;
	LSN17;
	LSN18;
	LSN19;
	LSN20;
	VAL

5.4. EXTENDED V.25 BIS COMMANDS

CNL - Local Configuration

	CNL<AT command>

Example:

	CNLS0=2

5.5. STANDARD V.25 BIS INDICATIONS

CFI - Call Failure Indication

AB No dial tone or the call abort timer expired with no call progress tone detected or during handshaking after answer tone detected.

CB

Local circuit busy (phone off-hook).

ET

Busy (engaged tone) detected.

FC

Requested number on forbidden call list (call not placed).

NS

No number stored at dial string memory requested (call not placed).

NT

Ringback detected: Ringback stopped: Call abort timer expired with no answer tone detected.

RT

Ringback detected: Call abort timer expired with ringback still detected.

CNX

Connect

The modem returns this message when a connection has been established. The message may be followed by a value indicating the connection speed.

Example:

	CNX 9600
  

DLC

- Delayed Call

The modem returns this message when a call fails to connect and the number dialled is considered 'delayed'. The message indicates the delay (in minutes) before the call may be re-attempted as shown in the following example:

	 DLCn (n = delay in minutes)
  

This message will be preceded by the message indicating call failure.

INC

- Incoming Call

The modem sends this message when incoming ringing is detected on the line.

INV

- Invalid Command

The modem sends this message if the command line contains a syntax error, or if the modem is unable to execute the command.

VAL

- Valid Command

The modem sends this message when it successfully executes the command issued and there is no other applicable response (message or circuit transition).

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