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Zoltrix AT Command Manual For Zoltrix Model FMHCF56i/FMVSP56SHCF/FM56KTOMCAT
Rev 1.01 10/9/1998

Dual Mode V.90/K56Flex 56,000/V.34 33,600 (V.90, K56 Flex, V.34, V.32bis, V.42bis, MNP2-5,10, Caller ID, Software upgradable)

AT Command Format

With the single exception of the A/ command, all commands to the modem begin with the characters AT, and end with a carriage return character, hence the name AT commands. The general format of an AT command is: AT<command string> where <command string> represents zero or more commands described in this manual. The <command string> can be null, resulting in the simple sequence "AT". This sequence, often called the attention command, is useful for checking that communication is established between an application program and the modem. The response to the AT command is always OK, providing positive indication of proper operation. It may be useful to issue the AT command several times, with a brief pause (100 ms. or so) between commands, until the OK response is received. Since the AT command string has no other effect except to elicit the OK response, it can be used whenever the modem is in command mode. The AT portion of an AT command can be in upper case or lower case, but not mixed case, thus AT or at, but not At or aT". The <command string> portion is independent of case. The <command string> may contain space characters, which are ignored.

Your Zoltrix MODEM has been pre-set at the factory for optimum performance.
All defaults are set to allow the modem to negotiate the best possible connection with highest quality, data compression, and error correction.

DEFAULT INIT STRING
The Default INIT string used at the factory and stored into the modem is as follows:

            AT&F&C1&D2

Because the modem was initialized at the factory, you could use an initialization (INIT) string of:

            ATZ

Note:   This command resets the modem to the stored settings. If the settings have been changed by software or manually, this INIT string may not work correctly.

You could change the INIT string in all of your software packages to either of the two previous examples. The first example is the best to use because some software may change the values stored in the modem.

If you want to custom configure your stored profiles, we suggest that you always start out with an AT&F&C1&D2 before customizing other commands. This string will reset the modem to the factory defaults as well as reset some other basic settings.

If modem performance suffers after modifying settings, send the INIT string above (AT&F&C1&D2) to the modem.

PERFORMANCE ISSUES

To get optimum performance from your Zoltrix MODEM, the phone line quality over which you are transmitting and receiving must be reliable and relatively free of "noise". If you have very noisy lines you may be able to get a good connection by forcing the modem to connect at a lower speed. Refer to the +MS command and Limiting the Modems Top Speed for information on controlling the modems speed.

LIMITING THE MODEMS TOP SPEED

If you experience problems connecting to slower modems (2400 or 1200bps), you may need to instruct your modem to limit the top speed to attempt. You may also need to limit the top speed the modem attempts to something less than 33,600bps, even when calling another 33,600 modem, because of the line noise in your area. If you don't, you may experience "garbage" or a "NO CARRIER" message.
This should not be neccassary in most cases, but, there are some 2400bps and 1200bps or even 9600bps modems you may not connect to without using  the following method:
 

• 1. Use the +MS= command. AT+MS=V34,1,19200,24000 will set the modem to use V.34 modulation, automode detection, with 19,200bps as the lowest transmit connection rate acceptable, and 24,400 as the highest transmit connection rate attempted.

AT+MS=V34,1,2400,24000 will set the modem to use V.34 modulation, automode detection, with 2,400bps as the lowest transmit connection rate acceptable, and 24,000 as the highest transmit connection rate attempted.

Note: See the +MS= command for more details and examples.

Command

Function

Data carrier detect (DCD) signal

&Dn

DTR Option

This command interprets the ON to OFF transition of the DTR signal from the DTE in accordance with the parameter supplied.

&D0

&D1

&D2

&F

Restore Factory Configuration (Profile)

&F

&Gn

Select Guard Tone

This command causes the modem to generate 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.

&G1

Disables guard tone.

&Pn

Select Pulse Dial Make/Break Ratio

This command determines the make/break ratio used during pulse dialing.

&P0

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

&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.

&V

Display Current Configuration and Stored Profiles

Reports the current (active) configuration, the stored (user) profiles, and the first 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.

Example:

AT&V 
ACTIVE PROFILE: 
E1 L1 M1 Q0 T V1 X4 &C1 &D2 &G2 &T0 &P0 
S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:050 S08:002 
S10:014 S12:050 S16:000 S18:000 S29:070 
 
STORED PROFILE 0: 
E1 L1 M1 Q0 T V1 X4 &C1 &D2 &G0 &T0 &P0 
S00:000 S02:043 S06:004 S07:050 S08:002 S10:014 S12:050 S18:000 S28:000 
S29:000 
 
OK

&Wn

Store Current Configuration

Saves the current (active) configuration (profile), including S-Registers, in the user profile 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 Z command or at power up.

&W0

Store the current configuration as profile 0.

Command

Function

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

Controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1) or fall back when line quality is insufficient or fall forward when line quality is sufficient (%E2). If enabled, the modem attempts to retrain for a maximum of 30 seconds. 

This command controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1) or a rate renegotiation when line quality merits a change. If enabled, the modem attempts to retrain for a maximum of 30 seconds. 
Syntax 

%E[<value>]

Defined Values 

<value> A decimal number corresponding to the selected option: 

0 = Disable line quality monitor, auto-retrain, and auto-rate renegotiation. 
1 = Enable line quality monitor, auto-retrain, and auto-rate renegotiation. (Default.)

Result Code 

OK <value> = 0 and 1 
ERROR Otherwise.

%L

%L

Example: 

%L 
015

Result Code 

OK

%Q

Example: 

AT%Q 
015

Result Code 

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

Command

Function

+FCLASS=<mode>

Defined Values 

<mode> Decimal number which corresponds to the selected service class. 
Command options: 

0 Select Data Mode (see Section 3). (Default.) 
1 or 1.0 Select Facsimile Class 1.0 Mode (see Section 4) 
8 Select Voice Mode (see Section 5) 
80 Select VoiceView Mode (see Section 5)

Result Codes 
OK For <mode> = 0, 1, 1.0, 8, and 80 as supported by the Product Configuration File. 
ERROR Otherwise. 
Reporting Current or Selected Values 
Command: +FCLASS? 
Response: +FCLASS: <mode> 
Example: +FCLASS: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +FCLASS=? 
Response: +FCLASS: (<mode> range) 
Example: +FCLASS: (0, 1,1.0,8, 80)

+GMI

Response 

ROCKWELL 
OK

+GMM

Typical Response 

RC56HCF 
OK

+GMR

Typical Response 

RC56HCF R6775 V2.0 5/29/97 
OK

+GSN

Typical Response 

VX.XXX-serial number 
OK

+GOI

Typical Response 

TBD 
OK

+GCAP

Example Responses 
+GCAP: +FCLASS, +MS, +ES, +DS, for a data modem that supports all capabilities listed 
Where: 
+FCLASS   T.class1, +F (Class 1 Facsimile modem Control) 
+MS           +M commands (Modulation Control: +MS and +MR commands) 
+ES            +E commands (Error Control: +ES, +EB, +ER, +EFCS, +ETBM) 
+DS           +D commands (Data Compression: +DS and +DR)

+IFC=[<modem_by_DTE>[,<DTE_by_modem>]]

Defined Values 
<modem_by_DTE> Specifies the method to be used by the DTE to control the flow of received data from the modem. 

0 = None. 
1 = XON/XOFF on transmitted data (XON/XOFF on transmit data); do not pass XON/XOFF characters to the remote modem. 
2 = Circuit 133 (Ready for Receiving). (Default.) 
3 = XON/XOFF on transmitted data with XON/XOFF characters being passed through to the remote modem in addition to being acted upon for local flow control.

<DTE_by_modem> Specifies the method to be used by the modem to control the flow of transmitted data from the DTE. 

0 = None. 
1= XON/XOFF on received data. 
2 = CTS/RTS. (Default.)

Reporting Current or Selected Values 
Command: +IFC? 
Response: +IFC: <modem_by_DTE>,<DTE_by_modem> 
Example: +IFC: 2,2 for the defaults. 
Reporting Supported Range of Parameter Values 
Command: +IFC=? 
Response: +IFC: (<modem_by_DTE> range),(<DTE_by_modem> range) 
Example: +IFC: (0-3),(0-2)

+ILRR=<value>

Defined Values 
<value> Decimal number corresponding to the selected option. 

0 Disables reporting of local port rate (+ILRR: is not transmitted). 
1 Enables reporting of local port rate (+ILRR: is transmitted).

Reporting Current or Selected Values 
Command: +ILRR? 
Response: +ILRR: <current value> 
Example: +ILRR: 0 For the default setting 
Reporting Supported Range of Parameter Values 
Command: +ILRR=? 
Response: +ILRR: (<value> range) 
Example: +ILRR: (0,1) 
Reported Rate 
The <rate> reported represents the current (negotiated or renegotiated) DTE-modem rate. If enabled, the intermediate result code is transmitted after any modulation, error control or data compression reports are transmitted, and before any final result code (e.g., CONNECT) is transmitted. The <rate> is applied after the final result code is transmitted. 
The DTE-modem port rate will change only if neither buffered mode nor error controlled means are enabled (+ES=x,0) and if the negotiated carrier rate (+MRR) does not match the current DTE-modem port rate (autodetected from the previous command line). 
Syntax 

+ILRR: <rate>[,<rx_rate>]

Defined Values 

<rate> Decimal value representing the current (negotiated or renegotiated) DTE-modem rate: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200 
<rx_rate> Optional decimal value reporting the RXD rate, if it is different from the TXD rate: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200

Example 

+ILRR: 19200

+H[<value>]

Defined Values 
<value> Decimal number corresponding to the selected option. 

0 Disable video ready mode. 
16 Enable video ready mode.

Result Codes 
OK <value> = 0 or 16. 
ERROR Otherwise.

+ETBM=[<pending_TD>[,<pending_RD>[,<timer>]]]

Defined Values 

<pending_TD> Decimal number 0 specifying that disconnect will occur immediately and all buffered transmit data will be discarded when the local DTE requests call disconnection. 
<pending_RD> Decimal number 0 specifying that disconnect will occur immediately and all buffered receive data will be discarded when the local DTE requests call disconnection. 
<timer> Decimal number 0 specifying that the modem will not attempt to deliver the buffered data before abandoning the attempt and discarding remaining data.

Reporting Current or Selected Values 
Command: +ETBM? 
Response: +ETBM: <pending_TD>,<pending_RD>,<timer> 
Example: +ETBM: 0,0,0 
Reporting Supported Range of Parameter Values 
Command: +ETBM=? 
Response: +ETBM: (<pending_TD> range),(<pending_RD> range), (<timer> range) 
Example: +ETBM: (0),(0),(0)

+ER=[<value>]

Defined Values 

<value> A decimal number corresponding to the selected error control option: 

0 = Error control reporting disabled (no +ER intermediate result code transmitted). 
1 = Error control reporting enabled (+ER intermediate result code transmitted). (Default.)

Reporting Current or Selected Values 
Command: +ER? 
Response: +ER: <current value> 
Example: +ER: 1 for the default setting 
Reporting Supported Range of Parameter Values 
Command: +ER=? 
Response: +ER: (<value> range) 
Example: +ER: (0,1) 
+ER: <type> 
The +ER: <type> reported represents the current (negotiated or renegotiated) modem-modem error control type. If enabled, the intermediate result code is transmitted at the point during error control negotiation (handshaking) at which the modem has determined which error control protocol will be used (if any), before the final result code (e.g., CONNECT) is transmitted. The format of this result code is: 
The +ER intermediate result code, if enabled, is issued after the Modulation report (+MCR and +MRR) and before the Data Compression Report (+DR). 
Syntax 

+ER: <type>

Defined Values 

<type> An alphanumeric code corresponding to the selected protocol. 

NONE Error control is not in use. 
LAPM V.42 LAPM protocol is in use. 
ALT MNP is in use.

Example 

+ER: LAPM

+MR=[<value>]

Defined Values 

<value> A decimal number corresponding to the selected option: 

0 = Disables reporting of modulation connection (+MCR: and +MRR: are not transmitted). 
1 = Enables reporting of modulation connection (+MCR: and +MRR: are transmitted). (Default.)

Reporting Current or Selected Values 
Command: +MR? 
Response: +MR: <current value> 
Example: +MR: 1 For default setting 
Reporting Supported Range of Parameter Values 
Command: +MR=? 
Response: +MR: (<value>range) 
Example: +MR: (0,1) 

The format of this information text is: 
+MCR: Report Syntax 
Response: +MCR: <carrier> 

<carrier> Alphanumeric code corresponding to the reported carrier. Defined values are: 

B103 For Bell 103 
B212 For Bell 212 
V21 For V.21 
V22 For V.22 
V22B For V.22bis 
V23C For V.23 
V32 For V.32 
V32B For V.32bis 
V34 For V.34 
K56FLEX For K56flex 
V90 For V.90

+MRR: Report Syntax 
Response: +MRR: <tx_rate>,<rx_rate> 

<tx_rate> Decimal transmit rate in bits/s. 
<rx_rate> Decimal receive rate in bits/s.

Example: +MRR: 28600, 48000

+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]

Defined Values 

<orig_rqst> Decimal number which specifies the initial requested mode of operation when the modem is operating as the originator. The options are: 

1 Initiate call with Normal Mode (also referred to as Buffered Mode or Direct Mode) only. 
2 Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42 Detection Phase. 
3 Initiate V.42 with Detection Phase. (Default.) 
4 Initiate MNP. 
6 Initiate V.80 Synchronous Access Mode when connection is completed, and Data State is entered. (See +ESA and +ITF commands.)

<orig_fbk> Decimal number which specifies the acceptable fallback mode of operation when the modem is operating as the originator. 

0 LAPM, MNP, or Normal Mode error control optional. (Default.) 
2 LAPM or MNP error control required; disconnect if error control is not established. 
3 LAPM error control required; disconnect if error control is not established. 
4 MNP error control required; disconnect if error control is not established.

<ans_fbk> Decimal number which specifies the acceptable fallback mode of operation when the modem is operating as the answerer or specifies V.80 Synchronous Access Mode. 

1 Error control disabled, use Normal Mode. 
2 LAPM, MNP, or Normal Mode error control optional. (Default.) 
4 LAPM or MNP error control required; disconnect if error control is not established. 
5 LAPM error control required; disconnect if error control is not established. 
6 MNP error control required; disconnect if error control is not established. 
8 Initiate V.80 Synchronous Access Mode when connection is completed, and Data State is entered (see +ESA and +ITF commands).

Examples 

+ES=6 Enable V.80 Synchronous Access Mode originator 
+ES=,,8 Enable V.80 Synchronous Access Mode answerer 
+ES=6,,8 Enable V.80 Synchronous Access Mode originator and answerer 
+ES=3 Enable V.42 with Detection Phase originator. Disable V.80 Synchronous Access Mode originator. 
+ES=,,2 Allow LAPM, MNP, or Normal Mode connection answerer. Disable V.80 Synchronous Access Mode answerer. 
+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM, MNP, or Normal Mode connection answer. Disable Synchronous Access Mode originator and answerer.

Reporting Current or Selected Values 
Command: +ES? 
Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk> 
Example: +ES: 3,0,2 For default settings. 
+ES: 6,0,8 For V.80 Synchronous Access Mode originator and answerer. 
Reporting Supported Range of Parameter Values 
Command: +ES=? 
Response: +ES: (<orig_rqst> range), ( <orig_fbk> range), (<ans_fbk> range) 
Example: +ES: (1-4,6),(0,2-4),(1-2, 4-6,8)

+EB=[<break_selection>[,<timed>[,<default_length>]]]

Defined Values 

<break_selection> Decimal number 0 specifying that break is to be ignored, i.e., not signaled to remote DCE. 
<timed> Decimal number 0 specifying that any transmitted V.42 L-SIGNAL will not indicate break signal length 
<default_length> Decimal number 0 specifying that break is not delivered to the DTE.

Reporting Current or Selected Values 
Command: +EB? 
Response: +EB: <break_selection>,<timed>,<default_length><CR> 
Example: +EB: 0,0,0 For default settings. 
Reporting Supported Range of Parameter Values 
Command: +EB=? 
Response: +EB: (<break_selection> range),(<timed> range), (default_length> range) 
Example: +EB: (0),(0),(0)

+ESR=[<value>] Decimal number 0 specifying that SREJ is not used.

Example: 

+ESR: (0) For default settings.

+EFCS=[<value>]

Defined Values 

<value> Decimal number 0 specifying the use of the 16-bit FCS specified in V.42.

Reporting Current or Selected Values 
Command: +EFCS? 
Response: +EFCS: <value> 
Example: +EFCS: 0 For default setting. 
Reporting Supported Range of Parameter Values 
Command: +EFCS=? 
Response: +EFCS: (<value> range) 
Example: +EFCS: (0)

This command is an action command if issued while the modem is off-hook, to (re)start V.8 or V.8bis negotiation. For example, if initial V.8 negotiation failed, but subsequent T.30 negotiation indicated V.8 capability, this command may be used to initiate V.8 negotiation. 
Syntax 

+A8E=<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]

Defined Values 

<v8o> Decimal number which enables/disables issuance of +A8 x indications during modem-controlled V.8 origination negotiation 

1 = Enable DCE-controlled V.8 origination negotiation without +A8x indications. (Default.) 
6 = Enable DCE-controlled V.8 origination negotiation with +A8 x indications.

<v8a>= Decimal number which enables/disables issuance of +A8 x indications during modem-controlled V.8 answer negotiation. 

1 = Enable DCE-controlled V.8 answer negotiation without +A8x indications. (Default.) 
5 = Enable DCE-controlled V.8 answer negotiation with +A8 x indications.

<v8c>= Set the V.8 CI signal call function to the hexadecimal octet value X. 

<v8b>= Decimal number which enables/disables V.8bis negotiation. 

0 = Disable V.8bis negotiation. (Default.) 
1 = Enable DCE-controlled V.8bis negotiation. 
2 = Enable DTE-controlled V.8bis negotiation.

<cfrange>= “<string of values>“. Applicable only for <v8a>=5 (not supported). 
< protrange >= “<string of values>“. Applicable only for <v8a>=5 (not supported).

Default values: 1,1,,1,"","" 
The ATD and ATA commands behave as specified in §6.3.1/V.25ter and §6.3.5/V.25ter, respectively, and +A8n indications are not generated by the modem. 
For subparameter values <v8o>=6 and <v8a>=5, the +A8I, +A8C, +A8A, +A8J, and +A8M indications are issued during the course of the V.8 session to notify the DTE when the relevant V.8 signals are received. The modem controls the V.8 ession, however, and the +A8M command is not used. 
Reporting Current or Selected Values 
Command: +A8E? 
Response: +A8E: <v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>] 
Example: +A8E: 1,1,,1,"","" For the defaults 
Reporting Supported Range of Parameter Values 
Command: +A8E=? 
Response: +A8E: (<v8o> range),(<v8a> range), (maximum size of v8cf in octets), (<v8b> range),(<cfrange> option bit range),(<protrange> option bit range) 
Example: +A8E: (1,6),(1,5),(1),(0),(1,6),(1)

+A8M=<hexadecimal coded CM or JM octet string>

+A8T=<signal>[,<1st message>][,<2nd message>][,< sig_en >][,<msg_en>][,<supp_delay>]

Defined Values 

<signal> Decimal number which specifies the V.8bis signal (see Table 3-1). 
 

<signal> Value	Description
0	None
1	Initiating MRe
2	Initiating MRd
3	Initiating CRe, low power
4	Initiating CRe, high power
5	Initiating CRd
6	Initiating ESi
7	Responding MRd, low power
8	Responding MRd, high power
9	Responding CRd
10	Responding ESr

 

<1st message> The transmitted V.8bis message frame(s) is specified as hexadecimal octet coded string (A.4.1). Additional messages are delimited by comma characters. Flag generation, flag transparency 0-bit insertion and FCS generation are performed by the modem. If no data is provided by the DTE, no V.21 carrier is generated beyond that used in segment 2. For two concatenated messages, the modem inserts the required preamble between the first and second messages. 

<2nd message> See <1st message> description. 

<sig_en> Decimal number which specifies enables the modem to search for specified V.8 bis signals: 

0 = Enable detection of initiating signals; 
1 = Enable detection of responding signals; 
2 = Enable detection of both signals.

<msg_en>, Decimal number which disables or enables the modem to search for V.8 bis messages. Note that detection of an ES signal automatically conditions the modem to look for an immediately subsequent V.8 bis message regardless of the setting of <msg_en>; see §A.9.2 

0 = Disables detection of the messages 
1 = Directs the modem to search for V.8 bis messages.

<supp_delay>, Decimal number which disables or enables the modem to insert a 1.5 second delay between the transmitted V.8 bis signal and the subsequent V.8 bis message, if any. 

0 = Disables insertion of a 1.5 second delay. 
1 = Enables insertion of a 1.5 second delay.

Reporting Current or Selected Values 
Command: +A8T? 
Response: +A8T: <signal>[,<1st message>][,<2nd message>][,< sig_en >][,<msg_en>][,<supp_delay>] 
Example: 1,XXXX,YYYY,1,1,1, 
Reporting Supported Range of Parameter Values 
Command: +A8T=? 
Response: +A8T: (<signal> range),(max length of message 1),(max length of message 2),(<sig_en> range) 
Example: +A8T: (0-10) (????),(????),(0-1),(0-1)

+A8I:<v8cf><CR>

Defined Values 

<v8cf> A hexadecimal code octet representation of those Call Function octet(s). +A8I:0 indicates that the modem timed out waiting for CI.

Example 

+A8I:0 The modem timed out waiting for CI. 
+A8I:X YYY

+A8C: <type><CR>

Defined Values 

<type> Decimal number which indicates the corresponding detected calling tone. 

0 The modem concluded answer tone transmission without reporting detection of any calling tone. 
1 CNG tone (1100 Hz) detected. 
2 1300 Hz V.25 data modem calling tone detected. 
3 sigC signal: V.32/V.32 bis AA tone detected.

Example 

+A8C: 1 For CNG tone detected.

+A8A:<type><CR>

Defined Values 

<type><CR> Decimal number which indicates the corresponding detected answer signal. 

0 The modem timed out waiting for an answering signal. 
1 V.8 ANSam signal (2100 Hz with amplitude modulation) detected. 
2 V.25 answer tone (2100 Hz) detected. 
3 V.25 answer tone with phase reversals detected. (Note) 
4 sigA signal: V.21 Ch2 with flags (e.g., T.30 control preamble) detected. 
5 sigA signal: V.22bis USB1 signal detected. 
6 sigA signal: V.32bis AC signal detected. 
7 sigA signal: V.34 ToneA signal detected.

Example 

+A8A:1 For V.8 ANSam signal (2100 Hz with amplitude modulation) detected.

+A8J:<value><CR>

Defined Values 

<value> Decimal number corresponding to the selected option. 

0 The modem timed out waiting for a CJ signal. 
1 CJ signal sent or detected.

Example 

+A8J:1 For CJ sent to a remote terminal.

+A8M:< hex_string>

Defined Values 

< hex_string> CM or JM hexadecimal coded string. A +A8M:0 indicates that the modem timed out waiting for a CM or JM signal.

Example 

A8M:XXX YYY

+A8R:<signal>[,[<1st message>]] [,<2nd message>]<CR>

Defined Values 

<signal> The V.8 bis signal, if detected, is indicated using a <signal> value (see Table 3-1). Values of 4 and 8 are not reported, i.e., the modem is not expected to discern the power level of received CRe and MRd signals. If a V.8 bis message is detected without a preceding V.8 bis signal, the preamble is reported as a 0 <signal> value. 

<1st message> The contents of valid V.8 bis message(s), if detected, are reported using hexadecimal octet coded string(s) (A.4.1). Flag detection and consumption, flag transparency 0-bit deletion and FCS checking are performed by the modem. The modem does not report invalid messages (e.g., bad FCS). If two consecutive messages are detected but the first is invalid, the modem indicates this with no characters between the first and second comma (e.g., +A8R:<signal>,,<2nd message>). 

<2nd message See <1st message>.

Example 

+A8R:0,XX,YY For a V.8 bis message detected without a preceding V.8 bis signal. 
+A8R:0,XX,YY For a V.8 bis message detected with a preceding V.8 bis signal.

+ESA=[<trans_idle> [,<framed_idle> [,<framed_un_ov> [,<hd_auto> [,<crc_type> [,<nrzi_en> [,<syn1> [,<syn2>]]]]]]]]

Defined Values 

<trans_idle> Decimal number which specifies the bit sequence transmitted by the modem when a transmit data buffer underrun condition occurs, while operating in Transparent sub-Mode. The options are: 

0 In Transparent sub-Mode, modem transmits 8-bit SYN sequence on idle. Modem receiver does not hunt for synchronization sequence (default and fixed).

<framed_idle> Decimal number which specifies the bit sequence transmitted by the modem when a transmit data buffer underrun condition occurs immediately after a flag, while operating in Framed sub-Mode. 
The options are: 

0 In Framed sub-Mode, modem transmits HDLC flags on idle (default and fixed).

<framed_un_ov> Decimal number which specifies the actions undertaken by the modem when a transmit data buffer underrun or overrun condition occurs immediately after a non-flag octet, while operating in 
Framed sub-Mode. 

0 In Frmed sub-Mode, modem transmits abort on underrun in middle of frame. (Default.) 
1 In Framed sub-Mode, modem transmits a flag on underrun in middle of frame, and notifies DTE of underrun or overrun.

<hd_auto> Decimal number which specifies whether or not, in V.34 half-duplex operation, additional procedures besides those specified in § 12/V.34 will be performed by the modem when switching from primary channel to secondary channel operation, and vice versa. This subparameter should not be commanded. 

<crc_type> Decimal number which specifies the CRC polynomial used while operating in Framed sub-Mode. 
The options are: 

0 CRC generation and checking disabled. (Default.) 
1 In Framed sub-Mode, use the 16-bit CRC specified in V.42. 
2 In Framed sub-Mode, use the 32-bit CRC specified in V.42.

<nrzi_en> Decimal number which specifies if Non Return to Zero Inverted (NRZI) encoding is to be used by the modem for transmit and receive data. The options are: 

0 NZRI encoding and decoding disabled (default and fixed).

<syn1>, <syn2> Decimal number which specifies the octet value(s) to be used while performing character-oriented framing. <syn1> is to be commanded to 255 (FFh); <syn2> is not to be commanded.

Reporting Current or Selected Values 
Command: +ESA? 
Response: +ESA: <trans_idle>, <framed_idle>, <framed_un_ov>, <hd_auto>, <crc_type>, <nrzi_en>, <syn1>, <syn2>

Example: +ESA: 0,0,0,,0,0,255, For the defaults. 
Reporting Supported Range of Parameter Values 
Command: +ESA=? 
Response: +ESA: (<trans_idle> range), (<framed_idle> range), (<framed_un_ov> range), (<hd_auto> range), 
(<crc_type> range), (<nrzi_en> range),(<syn1> range), (<syn2> range) 
Example: +ESA: (0),(0),(0-1), ,(0-2),(0),(255)

+ITF=[<off>[,<on> [,<report_period>]]]

Defined Values 

<off> Determines the threshold, in octets, above which the modem will generate a flow off signal. Applicable in Synchronous Access Mode. 
The <off> range is 20 -7000. Default <off> value is 128. 
For the <on> and <off> subparameters, the input buffer is assumed to reside between the modem’s V.24 interface and the Synchronous Access protocol layer; i.e., the buffer count includes all octets, including EM codes, received from the DTE, with the exception of XON and XOFF if these are used to signal <modem-by-DTE> flow control. 
The modem returns the ERROR result code if the DTE specifies that the <off> subparameter be set to a value less than or equal to the <on> subparameter; in this case, the current parameter value settings are set to default values. 

<on> Determines the threshold, in octets, below which the modem will generate a flow on signal. Applicable in Synchronous Access Mode. 

The <on> range is 10 -5000. Default <on> value is 64. 

<report_period> Not supported. A fixed value of zero is used and reported.

Reporting Current or Selected Values 
Command: +ITF? 
Response: +ITF: <off>,<on>,<report_period> 
Example: +ITF: 128,64,0 For default values 
Reporting Supported Range of Parameter Values 
Command: +ITF=? 
Response: +ITF: (<off> range),(<on> range),(<report_period> range) 
Example: +ITF: (20-7000),(10-5000),(0)

+MS=[<carrier> [,<automode> [,<min_tx_rate> [,<max_tx_rate> [,<min_rx_rate> [,<max_rx_rate>]]]]]] 

Notes: 

• 1. Subparameters not entered (enter a comma only or <CR> to skip the last subparameter) remain at their current values.

Reporting Selected Options 
The modem can send a string of information to the DTE consisting of selected options using the following command: 

+MS?

The response is: 

+MS: <carrier>,<automode>,<min_rate>,<max_rate>,<min_rx_rate>,<max_rx_rate>

Note: The current active settings are reported under control of the +MR parameter. 

Example: 

+MS: V90,1,75,33600,75,56000 For default values.

Reporting Supported Options 
The modem can send a string of information to the DTE consisting of supported options using the following command: 

+MS=?

The response is: 

+MS: (< carrier> range), (<automode> range), (<min_tx_rate> range), (<max_tx_rate> range), (<min_rx_rate> range), (<max_rx_rate> range)

For example, 

+MS: (B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,K56,V90), (0,1), (75-33600), (75-33600), (75-56000), (75-56000)
For V.21, V.22, V.22bis, V.32 and V.32bis, with Automode. 
 

The modem may also automatically switch to another modulation (automode), subject to the following constraints: 

• a. The modem may not be able to automatically switch from the current modulation (specified by <carrier>) to some other modulation. For example, there is no standard way to automode from Bell 103 to V.23.
• b. The DTE may disable automode operation (see <automode>).
• c. The DTE may constrain the range of modulations available by specifying the lowest and highest rates (see <min_tx_rate> and <max_tx_rate> and <min_rx_rate> and <max_rx_rate> below).

Result Code 
OK               Valid subparameter string 
ERROR        Otherwise.

Subparameter Definitions

• 1. <carrier> = A decimal number which specifies the preferred modulation (automode enabled) or the modulation (automode disabled) to use in originating or answering a connection. The options are:

<carrier>

Modulation

Possible Rates(bps) 

Notes

1. The modem may not support some other modulations, regardless of the automode mechanism supported.
2. The modem may not be able to automatically switch from the current modulation <carrier> to some other modulations, restricted by the selected modulation standard and by the modem manufacturer's technology. For example, there is no standard way to automode from V.32bis to V.27ter.
3. The DTE may disable automode operation, see <automode> below.
4. The DTE may constrain the range of modulations available, see <min_tx_rate> and <max_tx_rate> and <min_rx_rate> and <max_rx_rate> below.
5. The DTE may selectively disable some modulations by reading, editing and writing the +MA parameter (6.4.2).

If the DTE issues a +MS=<carrier> command to the modem, and if the modem supports the +MA 
parameter, the modem will reinitialize the +MA parameter.

• 2. <automode> An optional numeric value which enables or disables automatic modulation negotiation (e.g., ITU-T
• 
  V.32 bis Annex A or V.8). The default value is enabled if it is defined for the associated
  modulation (e.g., ITU-T V.32 bis, V.8 for V.34); however, there are modulations for which there is
  no automatic negotiation defined (e.g., V.26 bis).

For <automode> = 0 (automode disabled, i.e., fixed modulation):

• 1. If <max_rate> is within the rates supported by the selected modulation, the selected rate
• 
  is that specified by <max_rate>. For example:

  +MS=V32B,0,1200,4800 selects V.32 bis 4800 bps fixed rate.

• 2. If <max_rate> is greater than the highest speed supported by the modulation specified
• 
  by <mod>, the starting rate is the highest rate supported by the selected modulation. For
  example:

  +MS=10,0,2400,14400 selects V.32 bis 14400, 12000, 9600, 7200, or 4800 bps.
   

  For <automode> = 1 (automode enabled, i.e., automatically selected speed and modulation):

• 1. The modem connects at the highest possible rate in accordance with V.8 bis/V.8, or V.32
• 
  bis Annex A if V.8 bis/V.8 is not supported by the remote modem.
• 2. If <max_rate> is greater than the highest rate supported by the modulation specified by
• 
  <mod>, the modem automodes down from the highest rate of the selected modulation.
  For example:

  +MS=V32B,1,1200,14400 selects automoding down from V.32 bis 14400 bps.

Command

Function

+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]

Defined Values 

<direction> Specifies the desired direction(s) of operation of the data compression function; from the DTE point of view. 

0 = Negotiated; no compression (V.42bis P0=0). 
3 = both directions, accept any direction (V.42bis P0=11). (Default.)

<compr_neg> Specifies whether or not the modem should continue to operate if the desired result is not obtained. 

0 = Do not disconnect if V.42bis is not negotiated by the remote modem as specified in <direction>.

<max_dict> Specifies the maximum number of dictionary entries (2048 entries) which should be negotiated (may be used by the DTE to limit the codeword size transmitted, based on its knowledge of the nature of the data to be transmitted). 

<max_string> Specifies the maximum string length (32 bytes) to be negotiated (V.42bis P2).

Reporting Current or Selected Values 
Command: +DS? 
Response: +DS: <direction>,<compr_neg>,<max_dict>,<max_string> 
Example: +DS: 3,0,2048,32 for the defaults and 2048 entry max dictionary. 
Reporting Supported Range of Parameter Values 
Command: +DS=? 
Response: +DS: (<direction> range),(< compr_neg > range),(<max_dict> range),(<max_string> range) 
Example: +DS: (0,3),(0),(2048),(32)

+DR=[<value>] 

Defined Values 

<value> decimal number corresponding to the selected option: 

0 = Data compression reporting disabled (no +DR result code transmitted). 
1 = Data compression reporting enabled (+DR result code transmitted). (Default.)

Reporting Current or Selected Values 
Command: +DR? 
Response: +DR: <current value> 
Example: +DR: 1 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +DR=? 
Response: +DR: (<value> range) 
Example: +DR: (0,1) 
+DR: <type> Intermediate Result Code 
The +DR: <type> reported represents the current (negotiated or renegotiated) modem-modem data compression type. If enabled, the intermediate result code is transmitted at the point after error control negotiation (handshaking) at which the modem has determined which data compression technique will be used (if any) and the direction of operation. The +DR intermediate result code, if enabled, is issued after the Error Control Report (+ER) and before the final result code (e.g., CONNECT). 
The format of this result code is: 
Result Code Syntax 

+DR: <type>

Defined Values 

<type> An alphanumeric code corresponding to the selected option: 

NONE Data compression is not in use. 
V42B V.42bis is in use in both directions. 
ALT MNP 5 compression.

Example 

+DR: V42B

Command

Function

• 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 

• 1. The following example illustrates the standard Caller ID message packet.
• 
  RING 
  DATE = 0321 
  TIME = 1405 
  NMBR = 5045551234 
  NAME = A N OTHER 
  RING 
  RING

 

• 2. The following example illustrates
• 
  RING 
  MESG = 060342424231 
  RING 
  RING

Unformatted Form Reporting 
The modem presents all information and packet control information found in the message. The modem, however, excludes 
the leading U's (channel 
the modem does not insert spaces, or line feeds, for formatting between bytes or words of the packet. 
The modem does not detect the checksum of the packet. 
Example of Unformatted Form Reporting 

RING 
0412303332323234303539313435353132333435 
RING 
RING

+VDID=<digits> <timeout>

Defined Values 

<digits> The maximum number of digits (DTMF, MF, etc.) to expect after notifition of an incoming call by the Telco. Decimal 0 is the only valid number. 
<timeout> The time interval to wait after the last modem presented DID digit to wait before assuming that there is no more DID information to follow, and ending the DID digit report. Decimal 0 is the only valid number.

Reporting Current or Selected Values 
Command: +VDID? 
Response: +VDID: <digits> <timeout> 
Example: +VDID: 0,0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VDID=? 
Response: +VDID: (<digits> range),(<timeout> range) 
Example: +VDID: (0),(0)

+VNH=<hook>

Defined Values 

<hook> Decimal number corresponding to the selected option. 

0 The modem enables automatic hangups as is normal in other modes. 
1 The modem disables automatic hangups usually found in the other non-Voice Modes. 
2 The modem disables automatic hangups in the other non-Voice Modes. The modem performs only a “logical” hangup (returns to OK result code).

Reporting Current or Selected Values 
Command: +VNH? 
Response: +VNH: <hook> 
Example: +VNH: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VNH=? 
Response: +VNH: (<hook> range) 
Example: +VNH: (0-2) 
Result Codes 

OK <hook> = 0-2. 
ERROR Otherwise.

+VIP<n>

Defined Values 

<n> Decimal number 0 corresponding to the selected option.

Reporting Current or Selected Values 
Command: +VIP? 
Response: +VIP: <n> 
Example: +VIP: 0     For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VIP=? 
Response: +VIP: (<n> range) 
Example: +VIP: (0) 
Result Codes 

OK <n> = 0. 
ERROR Otherwise.

+VRX<n>

Defined Values 

<n> Decimal number corresponding to the selected option. 

0 Start receive voice without periodic tone production during a voice receive operation. 
1 Start receive voice with periodic tone production during a voice receive operation.

Reporting Current or Selected Values 
Command: +VRX? 
Response: +VRX: <n> 
Example: +VRX: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VRX=? 
Response: +VRX: (<n> range) 
Example: +VRX: (0,1) 
Result Codes 

OK <n> = 0 or 1. 
ERROR Otherwise.

+VTS=<string>

Defined Values 

<string> To be added

Reporting Current or Selected Values 
Command: +VTS? 
Response: +VTS: <freq1>, <freq2>, <dur> 
Example: +VTS: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VTS=? 
Response: +VTS: (<freq1> range), (<freq2> range), (<dur> range) 
Example: +VTS: (???) 
Result Codes 

OK <string> = 0 or 1. 
ERROR Otherwise.

+VTX

Result Codes 

CONNECT The modem accepts the command. 
ERROR       The modem is not connected to at least one off-hook telephone line or one non-telephone line.

+VGR=<gain>

Defined Values 

<gain> Decimal number between 0 and 255 corresponding to the gain.

Reporting Current or Selected Values 
Command: +VGR? 
Response: +VGR: <gain> 
Example: +VGR: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VGR=? 
Response: +VGR: <gain> range 
Example: +VGR: 0-255 
Result Codes 

OK <gain> = 0-255. 
ERROR Otherwise.

+VGT=<level>

Defined Values 

<level> Decimal number (0 and 255) corresponding to the volume level.

Reporting Current or Selected Values 
Command: +VGT? 
Response: +VGT: <level> 
Example: +VGT: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VGT=? 
Response: +VGT: <level> range 
Example: +VGT: 0-255 
Result Codes 

OK <level> = 0-255. 
ERROR Otherwise.

+VIT=<timer>

Defined Values 

<timer> Decimal number(0 and 255) corresponding to the time in units of 1.0 second. A value of 0 disables the timer.

Reporting Current or Selected Values 
Command: +VIT? 
Response: +VIT: <timer> 
Example: +VIT: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VIT=? 
Response: +VIT: <timer> range 
Example: +VIT: 0-255 
Result Codes 

OK <timer> = 0-255. 
ERROR Otherwise.

+VLS=<label>

Defined Values 

<label> Decimal number corresponding to the selected option. 

0 Modem on hook. Phone connected to line 
1 Modem connected to line. 
2 Modem connected to handset 
3 Modem connected to line and handset 
4 Modem connected to speaker 
5 Modem connected to line and speaker 
6 Modem connected to microphone 
7 Speaker and microphone routed to line via modem 
8 Modem connected to speaker 
9 Modem connected to line and speaker 
10 Speaker and microphone routed to line via Modem 
11 Modem connected to microphone 
12 Speaker and microphone routed to line via Modem 
13 Speaker and microphone routed to line via Modem 
14 Modem connected to Headset 
15 Speaker and microphone routed to line via Modem 
16 Enable (Mute) microphone 
17 Disable microphone 
18 Enable (mute) speaker 
19 Disable speaker

Reporting Current or Selected Values 
Command: +VLS? 
Response: +VLS: <label> 
Example: +VLS: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VLS=? 
Response: +VLS: <label> range 
Example: +VLS: 0-19 
Result Codes 

OK <label> = 0-19. 
ERROR Otherwise.

+VRA=<interval>

Defined Values 

<interval> Decimal number (0-600) specifying the silence interval time in units of 0.10 second between the end of one ring interval and the start of the next ring interval. A value of 0 forces the modem to report the OK result code immediately after the first Ringback. The range is 0.01 to 60.0 seconds for <interval> = 1 to 600.

Reporting Current or Selected Values 
Command: +VRA? 
Response: +VRA: <interval> 
Example: +VRA: 50 (0.5 seconds) For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VRA=? 
Response: +VRA: (<interval> range) 
Example: +VRA: (0-600) 
Result Codes 

OK <interval> = 0 -600 
ERROR Otherwise.

+VRN=<interval>

Defined Values 

<interval> Decimal number (0-60) specifying the time period, in units of 1.0 second, that the modem will wait for Ringback during call origination. A value of 0 forces the modem to report the OK result code immediately after dialing. The range is 1 to 60 seconds for <interval> = 1 to 60.

Reporting Current or Selected Values 
Command: +VRN? 
Response: +VRN: <interval> 
Example: +VRN: 10 (10 seconds) For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VRN=? 
Response: +VRN: (<interval> range) 
Example: +VRN: (0-60) 
Result Codes 

OK <interval> = 0 -60 
ERROR Otherwise.

+VSD=<sds>,<sdi>

Defined Values 

<sds> Decimal number corresponding to the selected parameter. 

0 Use +VSM silence compression setting and algorithm for long-term silence detection (if +VSM is in use) or proprietary silence compression setting and algorithm for long-term silence detection (if +VSM is not in use). 
127 Sets less aggressive long-term silence detection independent of presence or use of silence compression. 
128 Sets nominal long-term silence detection independent of presence or use of silence compression. 
129 Sets more aggressive long-term silence detection independent of presence or use of silence compression.

<sdi> Decimal number specifying the required period of silence, in units of 0.1 second, before the modem can report silence detected at the end of a voice receive either with the “Presumed End of Message” (QUIT) or “Presumed Hangup (SILENCE) event reports. A value of 0 disables the modem silence detection. The range is 0.1 to 25.5 seconds for <sdi> = 1 to 255.

Reporting Current or Selected Values 
Command: +VSD? 
Response: +VSD: <sds>,<sdi> 
Example: +VSD: 128, 50 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VSD=? 
Response: +VSD: (<sds> range),(<sdi> range) 
Example: +VSD: (0,127,128,129),(0-255) 
Result Codes 

OK <hook> = 0 or 1. 
ERROR Otherwise.

+VSM=<cml>,<vsr>,<sds>,<sel>

Defined Values 

<cml> Decimal number identifying the compression method. To be expanded. 
<vsr> <range of values> containing the supported range of voice samples per second of the analog signal. To be expanded. 
<scs> <range of values> containing the supported range of sensitivity settings for voice receives. To be expanded. To be expanded. 
<sel> <range of values> containing the supported range of expansion values for voice transmits.

Reporting Current or Selected Values 
Command: +VSM? 
Response: +VSM: <cml>,<vsr>,<sds>, <sel> 
Example: +VSM: 130,UNSIGNED PCM,8,0,(7200,11025),(127-129),(0)" 
Reporting Supported Range of Parameter Values 
Command: +VSM=? 
Response: +VSM: <cml>, <cmid>, <bps>, <tm>,<vsr>,<sds>, <sel> 

<cml> Decimal number identifying the compression method. 
<cmid> Alphanumeric string describing the compression method. 
<bps> Decimal number defining the average number of bits in the compressed sample not including silence compression. 
<tm> Decimal number (0-X) reporting the time interval, in units of 0.1 second, between timing marks. A value of 0 reports that timing marks are not supported. The range is 1 to 60 seconds for <tm> = 1 to 60. 
<vsr> <range of values> containing the supported range of voice samples per second of the analog signal. 
<scs> <range of values> containing the supported range of sensitivity settings for voice receives. 
<sel> <range of values> containing the supported range of expansion values for voice transmits.

Example: +VSM: 128, ADPCM,2,0,7200,(127-129),(0)<cr><lf> 
129,ADPCM,4,0,7200,(127-129),(0) <cr><lf> 
130,UNSIGNED PCM,8,0,(7200,11025),(127-129),(0) 
Result Codes 

OK Valid range. 
ERROR Otherwise.

+VTD=<dur>

Defined Values 

<dur> Decimal number specifying the default DTMF/tone generation duration in units of 0.01 second. A value of 0 specifies a manufacturer specific time interval. The range is 0.01 to 5 seconds for <dur> = 1 to 500.

Reporting Current or Selected Values 
Command: +VTD? 
Response: +VTD: <dur> 
Example: +VTD: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VTD=? 
Response: +VTD: (<dur> range) 
Example: +VTD: (0-500) 
Result Codes 

OK <dur>= 0-500. 
ERROR Otherwise.

+VDR=<enable>, <report>

Defined Values 

<enable> Decimal number corresponding to the selected option. 

0 The modem will not report ring cadence information. 
1 The modem will report ring cadence information as specified for the <report> subparameter.

<report> Decimal number specifying ring cadence information report when enabled by the <enable> subparameter. 

0 The modem will produce only DROF and DRON messages. The modem will not produce any RING event codes. The modem will report other call progress event codes as normal. 
Other The modem will produce only DROF and DRON messages. The modem will produce a RING event code after <report>/10 seconds after the falling edge of the ring pulse (i.e., after the DRON report).

Reporting Current or Selected Values 
Command: +VDR? 
Response: +VDR: <enable>,<report> 
Example: +VDR: 0,0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VDR=? 
Response: +VDR: (<enable> range),(<report>range) 
Example: +VDR: (0,1),(0-10) 
Result Codes 

OK <enable>,<report> = (0,1),(0-10) 
ERROR Otherwise.

+VDT=<enable>,<report>

Defined Values 

<enable> Decimal number corresponding to the selected option. 

0 The modem will not produce any control tone cadence report. 
1 The modem will produce control tone cadence report as specified for the <report> subparameter.

<report> Decimal number specifying the produced any control tone cadence report when enabled by the <enable> subparameter. 

0 The modem will produce only CPOF and CPON messages. 
Other Reserved.

Reporting Current or Selected Values 
Command: +VDT? 
Response: +VDT: <enable>,<report> 
Example: +VDT: 0,0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VDT=? 
Response: +VDT: (<enable> range),(<report> range) 
Example: +VDT: (0,1),(0) 
Result Codes 

OK <enable>,<report> = (0,1),(0) 
ERROR Otherwise.

+VBT=<deassert>,<assert>

Defined Values 

To be added

Reporting Current or Selected Values 
Command: +VBT? 
Response: +VBT: <deassert>,<assert> 
Example: +VBT: TBD For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VBT=? 
Response: +VBT: (<deassert> range), (assert>range) 
Example: +VBT: (820-4096),(6144-7372), 8192 
Result Codes 

OK <deassert>,<assert>= 0 or 1. 
ERROR Otherwise.

+VPR=<rate>

Defined Values 

<rate>> To be added.

Reporting Current or Selected Values 
Command: +VPR? 
Response: +VPR: <rate> 
Example: +VPR: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VPR=? 
Response: +VPR: (<rate> range) 
Example: +VPR: (0,1) 
Result Codes 

OK <rate> = 0 or 1. 
ERROR Otherwise.

+VSP=<mode>

Defined Values 

<mode> Decimal number corresponding to the selected option. 

0 The speakerphone function is OFF. 
1 The speakerphone function is ON.

Reporting Current or Selected Values 
Command: +VSP? 
Response: +VSP: <mode> 
Example: +VSP: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VSP=? 
Response: +VSP: (<mode> range) 
Example: +VSP: (0,1) 
Result Codes 

OK <mode> = 0 or 1. 
ERROR Otherwise.

+VDX=<mode>

Defined Values 

<mode> Decimal number corresponding to the selected option. 

0 The speakerphone mode is half duplex. 
1 The speakerphone mode is full duplex.

Reporting Current or Selected Values 
Command: +VDX? 
Response: +VDX: <mode> 
Example: +VDX: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VDX=? 
Response: +VDX: (<mode> range) 
Example: +VDX: (0,1) 
Result Codes 

OK <mode> = 0 or 1. 
ERROR Otherwise.

+VGM=<gain>

Defined Values 

<gain> Decimal number between 0 and 255 corresponding to the gain.

Reporting Current or Selected Values 
Command: +VGM? 
Response: +VGM: <gain> 
Example: +VGM: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VGM=? 
Response: +VGM: <gain> range 
Example: +VGM: 0-255 
Result Codes 

OK <gain> = 0-255. 
ERROR Otherwise.

+VGS=<gain>

Defined Values 

<gain> Decimal number between 0 and 255 corresponding to the gain.

Reporting Current or Selected Values 
Command: +VGS? 
Response: +VGS: <gain> 
Example: +VGS: 0 For the default setting. 
Reporting Supported Range of Parameter Values 
Command: +VGS=? 
Response: +VGS: <gain> range 
Example: +VGS: 0-255 
Result Codes 

OK <gain> = 0-255. 
ERROR Otherwise.

OK (0)

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

CONNECT (1)
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.

RING (2)
The modem sends this result code when incoming ringing is detected on the line. When cellular interface is selected, RING indicates that the cellular phone is receiving an incoming call.

NO CARRIER (3)
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.

ERROR (4)
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.

CONNECT 1200 (5)
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.)

NO DIALTONE (6)
For X2 and X4, the modem sends this result code if it has been instructed to wait for dial tone during dialing but none is received. When cellular phone interface is selected, NO DIALTONE indicates that cellular service is not currently available.

BUSY (7)
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.

NO ANSWER (8)
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.

CONNECT 0600 (9)
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.

CONNECT 2400 (10)
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.

CONNECT 4800 (11)
For X1, X2, X3, and X4, the modem sends this result code when:

• 1. The line speed is 4800 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
• 2. The DTE speed is 4800 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

CONNECT 9600 (12)
For X1, X2, X3, and X4, the modem sends this result code when:

• 1. The line speed is 9600 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
• 2. The DTE speed is 9600 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

CONNECT 7200 (13)
For X1, X2, X3, and X4, the modem sends this result code when:

• 1. The line speed is 7200 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
• 2. The DTE speed is 7200 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

CONNECT 12000 (14)
For X1, X2, X3, and X4, the modem sends this result code when:

• 1. The line speed is 12000 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or

• 2. The DTE speed is 12000 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

CONNECT 14400 (15)
For X1, X2, X3, and X4, the modem sends this result code when:

• 1. The line speed is 14400 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or

• 2. The DTE speed is 14400 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

CONNECT 19200 (16)
For X1, X2, X3, and X4, the modem sends this result code when:

• 1. The line speed is 19200 bps and the modem has been instructed to report the line speed to the DTE upon connecting, or
• 2. The DTE speed is 19200 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

CONNECT 38400 (17)
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.

CONNECT 57600 (18)
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.

CONNECT 115200 (19)
For X1, X2, X3, and X4, the modem sends this result code upon connecting when the DTE speed is 115200 bps and the modem has been instructed to report the DTE speed to the DTE upon connecting.

CONNECT 75TX/1200RX (22)
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.

CONNECT 1200TX/75RX (23)
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.

DELAYED (24)
For X4, the modem returns this result code when a call fails to connect and the number dialed is considered 'delayed' due to country blacklisting requirements.

BLACKLISTED (32)
For X4, the modem returns this result code when a call fails to connect and the number dialed is considered 'blacklisted'.

FAX (33)
The modem returns this result code when a fax modem connection is established in a facsimile mode.

DATA (35)
The modem returns this result code when a data modem connection is established in a facsimile mode.

CARRIER 300 (40)
The modem returns this result code when a 0-300 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 1200/75 (44)
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 Xn.)

CARRIER 75/1200 (45)
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 Xn.)

CARRIER 1200 (46)
The modem sends this result code when a 1200 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 2400 (47)
The modem sends this result code when a 2400 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 4800 (48)
The modem sends this result code when a 4800 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 7200 (49)
The modem sends this result code when a 7200 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 9600 (50)
The modem sends this result code when a 9600 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 12000 (51)
The modem sends this result code when a 12000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 14400 (52)
The modem sends this result code when a 14400 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 16800 (53)
The modem sends this result code when a 16800 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 19200 (54)
The modem sends this result code when a 19200 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 21600 (55)
The modem sends this result code when a 21600 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 24000 (56)
The modem sends this result code when a 24000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 26400 (57)
The modem sends this result code when a 26400 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 28800 (58)
The modem sends this result code when a 28800 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CONNECT 16800 (59)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 16800 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 21600 (61)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 21600 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 24000 (62)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 24000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 26400 (63)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 26400 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 28800 (64)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 28800 bps and the modem has been instructed to report the DTE speed upon connecting.

COMPRESSION: CLASS 5 (66)
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 Xn.)

COMPRESSION: V.42 bis (67)
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 Xn.)

COMPRESSION: NONE (69)
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 Xn.)

PROTOCOL: NONE (70)
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 Xn.)

PROTOCOL: LAPM (77)
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 Xn.)

CARRIER 31200 (78)
The modem sends this result code when a 31200 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 33600 (79)
The modem sends this result code when a 33600 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

PROTOCOL: ALT (80)
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 Xn.)

PROTOCOL: ALT-CELLULAR (81)
This message is sent to the DTE when the modem has connected in the MNP 10 mode and cellular power level adjustment is enabled (")M1 or )M2").(See S95 and Xn.)

CONNECT 33600 (84)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 33600 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 31200 (91)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 31200 bps and the modem has been instructed to report the DTE speed upon connecting.

CARRIER 28000 ()
The modem sends this result code when a 28000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)
 
CARRIER 29333 ()
The modem sends this result code when a 29333 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 30667 ()
The modem sends this result code when a 30667 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 33333 ()
The modem sends this result code when a 33333 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 34667 ()
The modem sends this result code when a 34667 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 37333 ()
The modem sends this result code when a 37333 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 38667 ()
The modem sends this result code when a 38667 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 41333 ()
The modem sends this result code when a 41333 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 42667 ()
The modem sends this result code when a 42667 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 45333 ()
The modem sends this result code when a 45333 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 46667 ()
The modem sends this result code when a 46667 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 49333 ()
The modem sends this result code when a 49333 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 50667 ()
The modem sends this result code when a 50667 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 53333 ()
The modem sends this result code when a 53333 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 54667 ()
The modem sends this result code when a 54667 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 32000 (150)
The modem sends this result code when a 32000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 34000 (151)
The modem sends this result code when a 34000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 36000 (152)
The modem sends this result code when a 36000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 38000 (153)
The modem sends this result code when a 38000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 40000 (154)
The modem sends this result code when a 40000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 42000 (155)
The modem sends this result code when a 42000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 44000 (156)
The modem sends this result code when a 44000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 46000 (157)
The modem sends this result code when a 46000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 48000 (158)
The modem sends this result code when a 48000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 50000 (159)
The modem sends this result code when a 50000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 52000 (160)
The modem sends this result code when a 52000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 54000 (161)
The modem sends this result code when a 54000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CARRIER 56000 (162)
The modem sends this result code when a 56000 bps data rate has been detected on the line and carrier reporting has been enabled. (See S95 and Xn.)

CONNECT 32000 (165)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 32000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 34000 (166)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 34000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 36000 (167)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 36000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 38000 (168)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 38000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 40000 (169)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 40000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 42000 (170)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 42000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 44000 (171)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 44000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 46000 (172)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 46000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 48000 (173)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 48000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 50000 (174)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 50000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 52000 (175)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 52000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 54000 (176)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 54000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 56000 (177)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 56000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 28000 (180)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 28000 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 29333 (181)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 29333 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 30667 (182)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 30667 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 33333 (183)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 33333 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 34667 (184)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 34667 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 37333 (185)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 37333 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 38667 (186)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 38667 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 41333 (187)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 41333 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 42667 (188)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 42667 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 45333 (189)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 45333 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 46667 (190)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 46667 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 49333 (191)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 49333 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 50667 (192)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 50667 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 53333 (193)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 53333 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 54667 (194)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 54667 bps and the modem has been instructed to report the DTE speed upon connecting.

CONNECT 230400 (20)
For X1, X2, X3, and X4, the modem returns this result code upon connecting when the DTE speed is 230400 bps and the modem has been instructed to report the DTE speed upon connecting.

+FCERROR (+F4)
This message is sent to the DTE when high speed fax data (V.27, V.29, V.33, or V.17) is expected and a V.21 signal is received.

• 1. 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.
• 2. RC288 and higher rate modems.
• 3. RC336 and higher rate modems.
• 4. RC56 modems.

S-REGISTERS

This section defines the purpose of the modem registers, and sequentially lists the registers and describes their functions. These registers affect various operating characteristics and allow you to obtain information about the modem, as well as test the modem. The valid ranges for the registers are also included.

READING A REGISTER VALUE

You can inquire about the current value of these  registers with the  S? command. To read the current value of a register, type:

AT Sn? [ENTER],

where n is a register number.

To read the register values of S0 and S7, type

AT S0? S7? [ENTER].

The modem will display the first register value, a carriage return, the next register value, a carriage return, and OK or 0.

CHANGING A REGISTER VALUE

To change a register value, use the Sn command (ATSn=v), where n is a register number and v is the new value you want to assign to the register. Type:

AT S0=1 [ENTER]

to have the modem automatically answer on the first ring.

Register

Function

0

Rings to auto-answer

Set the number of rings required before the modem answers. 0 setting disables auto-answer.

Range: 0 - 255 rings

Default: 0 (auto-answer disabled) (May be saved in NV Ram with the &Wn command.)

1

Ring counter

Count the number of rings before the modem answers.

Range: 0 - 255 rings

Default: 0 

2

Escape character

Define the character used for the three-character escape code sequence. 0 setting disables the escape code character.

Range: 0 - 255

Default: 43 (+) (May be saved in NV Ram with the &Wn command.)

3

Carriage return character

Define the character for carriage return

Range: 0 - 127

Default: 13 (carriage return)

4

Line feed character

Define the character for line feed 

Range: 0 - 127 

Default: 10 (line feed) 

5

Backspace character

Define the character for backspace

Range: 0 - 255

Default: 8 (backspace)

6

Wait before dialing

Set the length of time to pause after off hook before dial.

Range: 2 - 255 seconds

Default: 2 seconds (May be saved in NV Ram with the &Wn command.)

7

Wait for carrier after dial

Set the length of time that the modem waits for a carrier from the remote modem before hanging up.

Range: 1 - 255 seconds

Default: 50 seconds (May be saved in NV Ram with the &Wn command.)

8

Pause time for dial delay

Set the length of time to pause for the pause dial modifier ",".

Range: 0 - 255 seconds

Default: 2 seconds (May be saved in NV Ram with the &Wn command.)

9

Carrier detect response time

Define the length of time a signal is detected and qualified as a carrier.

Range: 1 - 255 tenths of a second

Default: 6 (0.6 seconds) (May be saved in NV Ram with the &Wn command.)

10

Lost carrier hang up delay

S10 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) (May be saved in NV Ram with the &Wn command.)

Note: For Call Waiting detection, if the modem is set to US country code and S10 >=16, then the modem will detect the Call

Waiting tone and hang-up the line. If S10 <16, the modem will not detect Call Waiting tone.

11

DTMF speed control

Set the length of tone and the time between tones for the tone dialing.

Range: 50 - 255 milliseconds

Default: 95 milliseconds (May be saved in NV Ram with the &Wn command.)

12

Escape Prompt Delay (EPD) timer

Set the time from detection of the last character of the three character escape sequence until the "OK" is returned to the DTE

Range: 0 - 255 fiftieths of a second

Default: 50 (1 second) (May be saved in NV Ram with the &Wn command.)

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.

Range: 0 - 255 hundredths of a second

Default: 70 (0.7 second)