Zoltrix Modem Manual For



                 Zoltrix 14,400 Fax/33,600 V.34 Modem

                



The commands listed in this document are for Zoltrix Modems based on

Rockwell International's ACI V.34+ chipset. To determine if your modem uses this

chipset send the following command from the "Terminal Mode" of a

communication program:



                   ATI6 [ENTER]



If your modem responds with ERROR, you do not have this chipset!



This document is intended for your modem if your Modem responds with

something simular to the following:



                   RC288DPi Rev 04BC

                   

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.



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



                   AT&F&C1&D2S95=3



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".





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 spped 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 one of

the following methods:



Note: Rockwell has changed the method of limiting the top speed. There is now

      one method that should be used in most cases. The older method of using

      the N0 command and setting S37 to a value will still work for speeds

      under 14,400, but the S37 settings above 14,400 that were used by the

      V.FC chipset will not function. The Fn command has also been eliminated

      and replaced with the +MS= command.



1.    Use the +MS= command. AT+MS=11,1,19200,24000 will set the modem to use

      V.34 modulation, automode detection, with 19200bps as the lowest

      connection rate acceptable, and 24,400 as the highest connection rate

      attempted. AT+MS=11,1,2400,24000 will set the modem to use

      V.34 modulation, automode detection, with 2400bps as the lowest

      connection rate acceptable, and 24,000 as the highest connection rate

      attempted.

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



2.    Use the combination of the N0 command along with setting S37 to the

      proper value to limit the modems connection speed attempted.

      

3.    Use the N0 command and set your software to the connection rate

      desired.

      Note: This is not the desired method to use if you are making an

            error-correction connection with compression! The softwares

            "BAUD" rate should be at least twice, and preferably four, times

            the Carrier rate established. Otherwise you will get no benifits

            from the compression. Transfers will actually be slower than if

            a non-compression connection was established. You also cannot set

            software to all the connection rates that are supported by the

            V.34 28,800 modem.





CUSTOM INIT STRINGS WITH DESCRIPTIONS OF MODEM CONFIGURATIONS



MODEL: ZOLTRIX V.34 33,600 (V.34,V.FC,V.32bis,V.42bis,MNP)

1) V.42bis Auto 

    Init String: AT&F&C1&D2W2

    This configuration should be the only configuration required to make all

    possible connections. The Modem will first attempt a V.42bis connection,

    if the remote Modem does not support V.42bis, the Zoltrix Modem will attempt

    an MNP5 connection, if the remote Modem does not support MNP5 the Zoltrix

    Modem will attempt an NORMAL connection (No error correction or compression).

    Because some Modems do not recognize the V.42bis handshaking sequence or you

    may want to make a special type of connection, we have added 15 possible

    connections types to ensure that the Zoltrix Modem will make a successful

    connection with all Modems.

2) V.42/MNP4 Auto

    Init String: AT&F&C1&D2W2S46=136%C0

     This configuration is the same as V.42bis Auto except that all compression

     is turned off (V.42bis and MNP5 disabled).

3)  MNP5

    Init String: AT&F&C1&D2W2S48=128

     This configuration will bypass the V.42bis and V.42 negotiation and attempt

     MNP5 first. If the remote Modem does not support MNP5 the Zoltrix Modem

     will attempt an NORMAL connection (No error correction or compression).

     Use this selection if you know that the remote Modem is only a MNP Modem

     and does not support V.42/V.42bis.

4) MNP4

    Init String: AT&F&C1&D2W2S48=128%C0

    This configuration will bypass the V.42bis and V.42 negotiation and attempt

    MNP4 first. If the remote Modem does not support MNP4 the Zoltrix Modem will

    attempt an NORMAL connection (No error correction or compression). Use this

    selection if you know that the remote Modem is only a MNP Modem and does not

    support V.42/V.42bis. This selection turns off the MNP5 compression. MNP5

    may actually slow down file transfers of compressed files, therefore you may

    want to turn MNP5 off but still want the error correction capabilities of

    MNP4.

5) NORMAL

    Init String: AT&F&C1&D2&Q6W2

    This configuration will not attempt V.42 or MNP but instead attempt a

    NORMAL connection. If you know that the remote Modem does not support

    V.42 or MNP, select this configuration type. This will actually speed up

    the hand-shaking process. Many non-error-correcting modems do not interpet

    the V.42 and MNP signals correctly. Using this selection will eliminate the

    problems seen when calling non-error-correcting modems.



Note:  You may add additional commands to any of the preceeding INIT strings, 

          but it is recommended that you put the additional commands at the end

          of the INIT string.



     

BASIC AT COMMANDS



Command   Description



AT        Attention characters

ATA       Answer command

ATA/      Re-Execute last command



CCITT or Bell

B0        Selects CCITT operation at 300 or 1200bps.

B1        Selects Bell operation at 300 or 1200bps.



Transmit Carrier Signal

ATC0      Not supported.

ATC1      Transmit carrier signal on.



ATD       none           Dial. (ATD followed by phone number)



Dial Modifiers



Dial   Options        Description

*      none           Dial the "star" digit (tone dialing only)

#      none           Dial the "pound" digit (tone dialing only)

L      none           Re-dial.

P      none           Pulse (rotary) dial. 10 pulses per second.

T      none           Touch tone dial (DTMF).

W      1-255 sec      Wait for dial-tone. Default is 50 seconds.

,      0-255sec       Pause. Default is 2 seconds.

@      none           Wait for quiet answer.

!      none           Initiate hook flash.

;      none           Return to command state after dialing.

&      none           Wait for credit card dialing tone before continuing

                      with the dial string. If bong is not detected within

                      the time specified by S7, the modem will abort the

                      rest of the sequence, return on-hook, and generate an

                      error mesage.

^      none           Enable calling tone.

S=0-3  none           Dial stored number.

()                    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.





Command Echo

ATE0      Disables echoing of the commands to the screen.

ATE1      Enables echoing of the commands to the screen.

          (default)



Disconnect (Hang-up)

ATH0      Instructs modem to go on-hook.

ATH1      Instructs modem to go off-hook.



Identification

ATI0      Displays the product identification code.

ATI1      Displays the checksum.

ATI2      Displays ROM checksum as OK or ERROR.

ATI3      Displays the firmware revision level.

ATI6      Reports modem data pump and internal code revision.



Speaker volume

ATL0      Off or low volume.

ATL1      Low volume. (default)

ATL2      Medium volume.

ATL3      High volume.



Speaker control

ATM0      Disables the modem speaker.

ATM1      Turns speaker on until carrier has been detected. (default)

ATM2      Instructs the modem speaker to stay on all of the time.

ATM3      Enables speaker after dialing until connection is established.



Automode enable

ATN0      Automode detection is disabled (equivalent to setting the

          +MS<automode> subparameter to 0). 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.

ATN1      Automode detection is enabled (equivalent to setting the

          +MS<automode> subparameter to 1). A subsequent handshake will be

          conducted according to the contents of S37 or, if S37 is zero,

          starting at 33,600 bps V.34. (Default)

Notes:

1. The Nn and S37=x commands override the +MS command settings. When the

   N0 or N1 command is issued, the +MS subparameters are updated to reflect

   the Nn and S37 values (see +MS command and S37 register). For example:

   N1S37=10 updates the +MS command subparameters to reflect +MS=10,1,300,12000

   N0S37=10 updates the +MS command subparameters to reflect +MS=10,0,300,12000



2. Use of the +MS command is recommended instead of the Nn and S37=x commands.

   Nn and S37=x commands are supported for compatibility with existing

   communication software.





Return to on line state mode

ATO0      Switches the modem from command mode to on-line mode after dropping

          to command mode using the escape sequence (+++).

ATO1      Switches from command mode to on-line mode an initiates an 

          equalizer retrain sequence before returning to on-line mode.



Set Pulse Dial as default

P         This command forces pulse dialing until the next T dial modifier

          or T command is received.



Mode responses

ATQ0      Enables result codes to be issued to the screen. (default)

ATQ1      Disables result codes to be issued to the screen. (Quiet mode)



Set Tone Dial as default

T         This command forces Tone dialing until the next P dial modifier

          or P command is received.



Result code format

ATV0      Numeric format.

ATV1      Verbal format. (default)



Error correction message control

ATW0      Error correction call progress not reported. (default)

ATW1      Call progress reported. Enables CARRIER and PROTOCOL result codes.

ATW2      Call progress not reported. Connect xxxx message

          reports DCE speed (Carrier rate).



Extended result codes

ATX0      Disables monitoring of busy tones unless forced otherwise

          by country requirements; sends only OK, CONNECT, RING,

          NO CARRIER, ERROR and NO ANSWER result codes.

ATX1      Disables monitoring of busy tones unless forced otherwise by

          country requirements; sends only OK, CONNECT, RING,

          NO CARRIER, ERROR, NO ANSWER and CONNECT XXXX result codes.

ATX2      Disables monitoring of busy tones unless forced otherwise by

          country requirements; sends only OK, CONNECT, RING,

          NO CARRIER, ERROR, DIAL TONE, NO ANSWER and CONNECT XXXX

          result codes.

ATX3      Enables monitoring of busy tones; sends only OK, CONNECT, RING,

          NO CARRIER, ERROR, NO DIALTONE, NO ANSWER and CONNECT XXXX.

ATX4      Enables monitoring of busy tones and sends all messages.

          (default)



Control long space disconnect

ATY0      Disables long space disconnect. (default)

ATY1      Enables long space connect.



Soft reset and restore profile

ATZ0      Restores stored profile 0.  (default)

ATZ1      Restores stored profile 1.





+++       Escape characters. The escape characters are known as +++.

          They will switch from on-line mode to command mode while

          preserving the connection with the on line modem.



EXTENDED AT COMMANDS



Command   Description



Data carrier detect (DCD) signal

AT&C0     Forces DCD signal to be on at all times.  (default)

AT&C1     DCD on indicates presence of data carrier.

          (REQUIRED BY MOST SOFTWARE)



Data terminal ready (DTR) signal. Interprets the ON to OFF transition of

the DTR signal from the DTE according to the &Q settings.



AT&D0     &Q0,5,6. DTR ignored.

          &Q1,4. Modem hangs up; auto answer not affected.

          &Q2,3. Modem hangs up; auto answer inhibited. (default)

AT&D1     &Q0,1,4-6. Asynchronous escape sequence.

          &Q2,3. Modem hangs up; auto answer inhibited.

AT&D2     &Q0-6. Modem hangs up; auto answer inhibited.

AT&D3     &Q0,1,4-6. Modem does a soft reset as if the ATZ

          command were received;

          &Q2,3. Modem hangs up; auto answer inhibited.



AT&F      Recalls factory defaults 0. Instructs the modem to load the

          factory set parameters (these can NEVER change).

AT&F1     Recalls factory defaults 1.



Select Guard Tone

AT&G0     Disables guard tone. (Default)

AT&G1     Disables guard tone.

AT&G2     Selects 1800hz guard tone.



Telephone Jack Control

AT&J0     No function but included for compatibility.

AT&J1     No function but included for compatibility.



DTE/Modem flow control

AT&K0     Disable flow control.

AT&K3     Enable RTS/CTS (default for data modem)

AT&K4     Enable XON/XOFF.

AT&K5     Enable transport XON/XOFF.

AT&K6     Enable both RTS/CTS and XON/XOFF (default for FAX and Voice modes.)



Note on Flow Control.

XON/XOFF is a software-based flow control method, using standard ASCII

control characters to pause or resume data transmission. 

RTS/CTS pacing, a hardware-based method, uses an electrical signal.

Signals are exchanged as follows:



RECEIVER                 TRANSMITTER

CTS ON --------------->  START SENDING

CTS ON <--------------   RTS ON (ready to send)

CTS OFF -------------->  RTS OFF (stop sending)



Command   Description



Select pulse dial make/break ratio

AT&P0          Selects a make/break ratio of 39/61 at 10pps.

               US and Canada. (default)

AT&P1          Selects a make/break ratio of 33/67 at 10pps.

               UK and Hong Kong.

AT&P2          Same as 0 except at 20pps.

AT&P3          Same as 1 except at 20pps.



Asynchronous mode

AT&Q0          Direct Asynchronous mode. All "Error Correction" and 

               "Compression" protocols are turned off. This requires that

               the Softwares "BAUD" rate matches the Modems.

AT&Q5          Modem negotiates an error-corrected link.      (default)

AT&Q6          Selects asynchronous operation in normal mode.

               (Speed Buffering allows software "BAUD" rate to be locked

                at a fixed rate.)

RTS/CTS Option

AT&R0          In sync mode, CTS tracks the state of RTS; the RTS-to-CTS

               delay is defined by S26. In async mode, CTS acts according

               to V.25bis handshake.

AT&R1          In sync mode,CTS is always ON (RTS transition are ignored).

               In async mode, CTS will only drop if required by flow control.

               (Default)



Data Set Ready (DSR) signal

AT&S0          Causes DSR signal to be active at all times. (default)

AT&S1          Causes DSR signal to be active after answer tone has been

               detected and inactive after the carrier has been lost.



Test and diagnostics

The modem will perform selected test and diagnostic functions according to

the parameter supplied. A test can be run only when in an asynchronous

operation in non-error-correction mode. To terminate a test in progress, the

escape sequence must be entered first, except for parameters 7 and 8. If

S18 is non-zero, a test will terminate automatically after the time

specified by S18 and display the OK message.

AT&T0          Terminates any test in progress.

AT&T1          Executes the local analog loopback test.

AT&T3          Executes the local digital loopback test.

AT&T4          Enables the modem to accept a request from a

               remote mode for a digital loopback test. (default)

AT&T5          Instructs the modem to deny a request from a

               remote modem for a digital loopback test.

AT&T6          Executes the remote digital loopback test.

AT&T7          Executes the remote digital loopback test with a

               self test.

AT&T8          Executes the remote analog loopback test with a

               self test.



AT&V           View current configuration and user profile.

Following is an example of the resulting display:



ACTIVE PROFILE:

B1 E1 L3 M1 N1 Q0 T V1 W2 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 &Y0

S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:050 S08:002 S09:006

S10:014 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:020 S44:020

S46:138 S48:007 S95:003



STORED PROFILE 0:

B1 E1 L3 M1 N1 Q0 T V1 W2 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0

S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000

S36:007 S37:000 S40:104 S41:195 S46:138 S95:003



STORED PROFILE 1:

B1 E1 L2 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D0 &G0 &J0 &K3 &Q5 &R1 &S0 &T4 &X0

S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000

S36:007 S37:000 S40:104 S41:195 S46:138 S95:000



TELEPHONE NUMBERS:

0=                                     1=

2=                                     3=



OK





Store user profile. Saves the current configuration into

non-volatile RAM as one of two user profiles.

AT&W0          Saves as user profile 0.

AT&W1          Saves as user profile 1.



Designate default user profile

AT&Y0          Selects user profile 0.

AT&Y1          Selects user profile 1.



Stored phone number

AT&Z=0         Stores a 36 digit dial string.

AT&Z=1         Stores a 36 digit dial string.

AT&Z=2         Stores a 36 digit dial string.

AT&Z=3         Stores a 36 digit dial string.





MNP Operation



The Zoltrix V.34 28,800bps Modems supports all of the preceding

classes. The following AT Commands apply to the MNP protocol.

Many of the following commands may be overridden or perform the same function

as other Extended AT Commands.



Default values are highlighted.





Maximum MNP Block Size. Use this command to transmit smaller

blocks of data in a reliable data link connection.



AT\A0          set maximum block size to 64 characters.

AT\A1          set maximum block size to 128 characters. (DEFAULT)

AT\A2          set maximum block size to 192 characters.

AT\A3          set maximum block size to 256 characters.



Transmit Break. When this command is entered during a non-MNP

connection, a break signal is sent to the remote modem.

The length of the break is 100 times the n parameter (1-9) in

milliseconds. The default is 3.

AT\B3          (DEFAULT)



Break Control. Determines the modem response when a BREAK is

received from the DTE or the remote modem. The values of the

parameters vary based on the three following conditions:



(1) When a break is received from the DTE during NORMAL or MNP

mode:



AT\K0, 2, 4    modem enters command mode without sending a break

               to the remote modem.

AT\K1          modem clears the terminal and modem buffers and

               sends a break to the remote modem.

AT\K3          modem does not clear the buffers, but sends a

               break to the remote modem.

AT\K5          modem sends a break to the remote modem in

               sequence with any transmitted data. (DEFAULT)



(2) When a break is received from the remote modem during NORMAL

mode:



AT\K0, 1       modem clears the terminal and modem buffers and

               sends a break to the local DTE.

AT\K2, 3       modem does not clear the buffers but sends a break

               to the local DTE.

AT\K4, 5       modem sends a break in sequence with any data

               being buffered. (DEFAULT)



(3) When a break is received from the DTE during DIRECT MODE mode:



AT\K0,1,3      modem sends a break to the remote modem and enters

               command mode.

AT\K2, 4, 5    modem sends a break to the remote modem. (DEFAULT)





Error Correction Operating Mode. Selects the operating mode the

modem uses while connected.



AT\N0          NORMAL (speed buffering) mode. (Forces &Q6)

AT\N1          DIRECT (pass-through) mode.    (Forces &Q0)

AT\N2          RELIABLE LINK mode. Specifies error correction

               for  the modem-to-modem connection.

               (Forces &Q5, S36=4, and S48=7.)

AT\N3          AUTO-RELIABLE LINK mode. Attempts error-correction

               connection but will fall back to normal mode if

               unable to establish an MNP link.

               (Forces &Q5, S36=7, and S48=7.)

AT\N4          LAPM error correction mode. (Forces &Q5 and S48=0)

AT\N5          MNP error correction mode. (Forces &Q5, S36=4, and S48=128.)



AT Commands for V.42/V.42bis



The following AT commands apply to the V.42/V.42bis protocol:



Compression Control. Determines whether or not modem will use

data compression.



AT%C0          disables data compression

AT%C1          enables MNP5 data compression negotiation

AT%C2          enables V42bis data compression

AT%C3          enables both V.42bis and MNP5 data compression

               (DEFAULT)



Auto-retrain. Determines whether or not the modem automatically

monitors the line quality and requests a retrain when necessary.



AT%E0          Disables line quality monitor auto-retrain.

               (DEFAULT)

AT%E1          Enables line quality monitor auto-retrain.

AT%E2          Enables line quality monitor auto retrain and auto

               fall back/forward.



Report Received Signal Level.



AT%L      009 = -9 dBm, 010 = -10dBm, etc. all the way to 043

          (-43 dBm)



AT%Q      Line Signal Quality

Line signal and noise are determined by the unit of measurement dBm

(decibel referenced to one milliwatt). To arrive at a signal/noise ratio,

the noise level is subtracted from signal level in dBm.



Report Line Signal Quality. Returns a "high-order" byte of the calculated

EQM ("eye quality monitor"). When the value gets too high, the modem will

automatically retrain if enabled by the AT%E1 command. The value for a

normal connection ranges from 0 to 30 and approaches 127 for a progressively

poorer connection. Returns an OK result code.





AT+MS      Select Modulation

This extended-format command selects the modulation, optionally enables or

disables automode, and optionally specifies the lowest and highest connection

rates using one to four subparameters. The command format is:

          

          +MS=<mod>[,[<automode>][,[<min_rate>][,[<max_rate>]]]]<CR>



Notes:

1.  For 14400 bps and lower speeds, the Nn command and S37 register can

    alternatively be used, in which case the +MS subparameters will be modified

    to reflect the Nn and S37=x settings. Use of the Nn and S37=x commands is

    not recommended but is provided for compatibility with existing

    communication software. (S37 is not updated by the +MS command.)

2.  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:



        <mod>,<automode>,<min_rate>,<max_rate>



For Example:

   

        11,1,300,33600



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:



        (list of supported <mod> values),(list of supported <automode> values),

        (list of supported <min_rate> values),

        (list of supported <max_rate> values)



For Example:



        (0,1,2,3,9,10,11,64,69,74),(0,1),(300-33600),(300-33600)



Subparameter Definitions



1.  <mod> = A decimal number which specifies the prefered modulation (automode

            enabled) or the modulation (automode disabled) to use in

            originating or answering a connection. The options are:



<mod>  Modulation    Possible Rates (bps) {see note 1}

  0      V.21            300

  1      V.22            1200

  2      V.22bis         2400 or 1200

  3      V.23            1200         {See note 2}            

  9      V.32            9600 or 4800

 10      V.32bis         14400,12000,9600,7200, or 4800

 11      V.34/V.34+      33600,31200,28800,26400,24000,21600,19200,16800,

                         14400,12000,9600,7200,4800, or 2400

 64      Bell 103        300

 69      Bell 212        1200

 74      V.FC            28800,26400,24000,21600,19200,16800, or 14400

Notes:

1. See optional <automode>,<min_rate>, and <max_rate> subparameters.

2. Not supported by Zoltrix V.34 Fax/Modem.



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 <mod>) 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> below).

c.  The DTE may constrain the range of modulations available by specifying

    the lowest and highest rates (see <min_rate> and <max_rate> below).



2.  <automode> is an optional numeric value which enables or disables automatic

modulation negotiation using V.8 or V.32bis Annex A. The options are:



<automode>   Option Selected

  0          Automode disabled

  1          Automode enabled using V.8 or V.32 Annex A



  The default value is 1, which enables automode. Note, however, there are

  modulations for which there is no automatic negotiation, e.g., Bell 212.



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



a. If <max_rate> is within the rates supported by the selected modulation,

   the selected rate is that specified by <max_rate>. For example:



        +MS=9,0,1200,4800   selects V.32 4800 bps fixed rate.



b. 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=9,0,2400,14400  selects V.32 at 9600 or 4800 bps.



c. To emulate issuance of the N0S37=x command sequence to select fixed mode

   operation, specify the <max_rate> and <min_rate> both to be the same

   requested speed, and <mod> to be the modulation for that speed. For example:



        +MS=11,0,16800,16800   selects V.34 16800 bps fixed mode

        (no comparable S37 command).



        +MS=9,0,12000,12000   selects V.32bis 12000 bps fixed mode

        (same as N0S37=10)



For <automode> = 1 (automode enabled,

                    i.e. automatically selected speed and modulation):



The modem connects at the highest possible rate in accordance with V.8, or

V.32bis Annex A if V.8 is not supported by the remote modem.



a. 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=10,1,1200,24000  selects automoding down from V.32bis 14400 bps.



b. To emulate issuance of the N1S37=x sequence command, specify the modulation

   and the rate to start automoding down from using <mod> and <max_rate>,

   respectively. Set <min_rate> to 300 to allow automoding all the way down

   to V.21 300 bps. For example:



         +MS=11,1,300,16800  selects automode starting at V.34 16800 bps

         (no comparable S37 command).



         +MS=9,1,300,12000  selects automode starting at V.32bis 1200 bps

         (same as N1S37=10).



3. <min_rate> is an optional number which specifies the lowest rate at which

   the modem may establish a connection. The value is decimal coded, in units

   of bps, e.g., 2400 specifies the lowest rate to be 2400 bps. The default

   is 300 for 300 bps.



4. <max_rate> is an optional number which specifies the highest rate at which

   the modem may establish a conection. The value is decimal coded, in units

   of bps, e.g., 14400 specifies the highest rate to be 14400 bps. The default

   is 33600 for 33600 bps.



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 firt ring.





S0      Auto Answer

        Range: 0-255    Unit:Ring

        This register holds the number of rings the modem will wait for

        before answering the phone if a ring is detected. It is usually set

        in the software. If this register is set to zero, the modem will not

        answer the phone.



S1      Ring Count

        Range: 0-255    Unit:Ring

        This register counts the number of rings detected on the line. 

        It is cleared if a ring is not detected over an eight second time

        period. If the register value equals the value contained in S0, the

        modem will answer the phone.



S2      Escape Code Character

        Range: 0-127    Unit:ASCII

        This register contains the ASCII value of the character used as the

        Escape Code. The default of 043 is the "+".



S3      Carriage Return Character

        Range: 0-127    Unit:ASCII

        This register contains the ASCII value of the character used to send

        a carriage return. The default value of 013 is the normal carriage

        return.



S4      Line Feed Character

        Range: 0-127    Unit:ASCII

        This register contains the ASCII value of the character used to send

        a line feed. The default value of 010 is the normal line feed.



S5      Backspace Character

        Range: 0-32    Unit:ASCII

        This register contains the ASCII value of the character used to back

        space. The default value of 008 is the normal backspace.



S6      Wait for Dial Tone

        Range: 2-255    Unit:Seconds

        This register stores the number of seconds the modem will wait

        between going off-hook and starting the dial sequence. The minimum

        time is two seconds, even if the register value is lower.



S7      Wait for Carrier

        Range: 0-255    Unit:Seconds

        This register stores the amount of time the modem will wait for the

        carrier signal from the remote modem. If a carrier is not received

        in this time, the modem will hang up and send the NO CARRIER

        result code.



S8      Pause Time for Carrier

        Range: 0-255    Unit:Seconds

        The value of this register determines how long the modem should

        pause when it sees a comma in the dialing string.



S9      Carrier Detect Response Time

        Range: 1-255    Unit:1/10 Second

        This register contains the time required for the modem to recognize

        the receive character from the remote modem, and turn on DCD

        (Data Carrier Detect).



S10     Lost Carrier to Hangup Delay

        Range: 1-255    Unit:1/10 Second

        This register value determines the amount of time from when the

        modem recognizes a loss of carrier to when it will hang up.

        If this value is set lower than the value contained in S9, a loss

        of carrier will always result in a disconnection.



S11     Duration/Spacing DTMF

        Range: 50-255    Unit:1/1000 Second

        This register contains the duration of and the spacing between DTMF

        (touch tone) dialing characters.



S12     Escape Prompt Delay (EDP)

        Range: 0-255     Unit:1/50 Second

        Defines the maximum period, in fiftieths of a second, allowed between

        receipt of the last character of the three escape character sequence

        from the DTE and sending of the OK result code to the DTE. If any

        characters are detected during this time, the OK will not be sent.

        Note that sending of the OK result code does not affect entry into

        command mode.



S13     Not Used



S14     BIT MAPPED OPTIONS      Value  Description Command

Bit 0   Used Internally

Bit 1   Command Echo             0    Disabled     E0

                                 1    Enabled      E1

Bit 2   Result Codes             0    Enabled      Q0

                                 1    Disabled     Q1

Bit 3   Result Code Type         0    Numeric      V0

                                 1    Verbal       V1

Bit 4   Used Internally

Bit 5   Dial Method              0    Tone         T

                                 1    Pulse        P

Bit 6   Used Internally

Bit 7   Originate/Answer         0    Answer       A

                                 1    Originate    D



S15     Not Used



S16     Modem Test Options      Value  Description Command

Bit 0   Local Analog Loopback    0    Disabled

                                 1    Enabled      &T1

Bit 1   Not Used

Bit 2   Local Digital Loopback   0    Disabled

                                 1    Enabled      &T3

Bit 3   Status Bit               0    Loopback Off

                                 1    In Progress               

Bit 4   Initiate Remote          0    Disabled

        Digital Loopback         1    Enabled      &T6

Bit 5   Remote Digital Loopback  0    Disabled          

        With Error Count         1    Enabled      &T7

Bit 6   Local Analog Loopback    0    Disabled

        With Self Test           1    Enabled      &T8

Bit 7   Not Used



S17     Not Used



S18     Test Timer

        Range: 0-255    Unit: Seconds

        This register value determines how long a diagnostic test will be

        allowed to run before being aborted. With the value set to zero,

        (the default), the test timer is disabled and the test must be

        terminated by issuing an &T0 or H command. When S18 is non-zero,

        the modem returns the OK message upon test termination.



S19     Not Used



S20     Not Used



S21     Bit Mapped Options    Value  Description            Command

Bit 0   Telephone Jack         0    RJ11                    &J0

                               1    RJ12                    &J1

Bit 1   Not Used

Bit 2   RTS/CTS                0    CTS/RTS                 &R0

                               1    CTS always true         &R1

Bit 3,4 DTR                    0    Ignore DTR              &D0

                               1    Modem to Command State  &D1

                                    on the ON-to-OFF 

                                    DTR transition

                               2    Modem hangs up          &D2

                                    on the ON-to-OFF 

                                    DTR transition

                               3    Initialization state    &D3

                                    on the ON-to-OFF

                                    DTR transition

Bit 5   DCD                    0    Always on               &C0

                               1    Follows Carrier         &C1

Bit 6   Not Used

Bit 7   Long Space Disconnect  0    Disabled                Y0

                               1    Enabled                 Y1







S22     Bit Mapped Options     Value  Description                 Command

Bit 0,1 Speaker Volume          0    Low                         L0

                                1    Low                         L1

                                2    Medium                      L2

                                3    High                        L3

Bit 2,3 Speaker Control         0    Speaker off                 M0

                                1    On until carier             M1

                                     detected

                                2    Always on                   M2

                                3    On until carrier            M3

                                     detected,but off

                                     while dialing

Bit 4,  Result Codes            0    See X0 command              X0

   5,6

                                4    See X1 command              X1

                                5    See X2 command              X2

                                6    See X3 command              X3

                                7    See X4 command              X4

Bit 7   Make/Break Ratio        0    39:61 (US)                  &P0

                                1    33:67 (UK)                  &P1



S23     Bit Mapped Options        Value Description     Command

Bit 0   Obey request from remote   0    Disabled       &T5

        modem for remote digital   1    Enabled        &T4

        loopback test

Bit 1,  Assumed DTE Rate           0    300 bps

   2,3                             1    600 bps

                                   2    1200bps

                                   3    2400bps

                                   4    4800bps

                                   5    9600bps

                                   6    19200bps

Bit 4,5 Parity Option              0    Even

                                   1    Space

                                   2    Odd

                                   3    Mark

Bit 6,7 Guard Tones                0    Disabled       &G0

                                   1    Disabled       &G1

                                   2    1800 Hz        &G2



S24     Not Used



S25     Async DTR Delay

        Range: 0-255     Unit:1/100 Second

        The modem will ignore a change in the DTR status for the time

        interval that is defined in this register when in the

        asynchronous mode.



S26     Sync RTS/CTS Delay

        Range: 0-255     Unit:1/100 Second

        The modem will ignore a change in the RTS/CTS status for the time

        interval that is defined in this register, when in the 

        synchronous mode.



S27     Bit Mapped Options   Bits               Description     Command

                              3  1  0



Bit 0,1 Operation Mode        0  0  0           See &Q0         &M0 or &Q0

    3                         0  0  1           See &Q1         &M1 or &Q1

                              0  1  0           See &Q2         &M2 or &Q3

                              0  1  1           See &Q3         &M3 or &Q3

                              1  0  0           See &Q4         &Q4

                              1  0  1           See &Q5         &Q5

                              1  1  0           See &Q6         &Q6

Bit 2   Line Type             0                 Dial up         &L0

                              1                 Leased line     &L1

Bit 4,5 Transmit Clock        0                 Internal        &X0

                              1                 External        &X1

                              2                 Slave           &X2

Bit 6   Service Type          0                 CCITT           B0

                              1                 Bell 212A       B1

Bit 7   Not Used



S28     Not Used



S29     FLASH DIAL MODIFIER TIME

        Range: 0-255    Unit:1/100 Second

        Sets the length of time that the modem will go off-hook when it

        encounters the flash (!) dial modifier in the dial string.



S30     DISCONNECT INACTIVITY TIMER

        Range: 0-255    Unit: 10 seconds

        Sets the length of time that the modem will stay online before

        disconnecting when no data is sent or received. In

        error-correction mode, any data transmitted or received will reset

        the timer. In other modes, any data transmitted will reset the

        timer. The timer is inoperative in synchronous mode.



S31     Bit Mapped Options.   Bits               Description     Command

Bit 0   Not Used

Bit 1   Speed detection        0                 Disabled        N0

                               1                 Enabled         N1

Bit 2,3 Progress Messages      0                 DTE speed       W0

                               1                 Full reporting  W1

                               2                 DCE speed       W2

Bit 4-7 Not Used



S32     XON Character

        Range: 0-255    Unit: ASCII

        Sets the value of the XON character. Default value is 17.



S33     XOFF Character

        Range: 0-255    Unit: ASCII

        Sets the value of the XOFF character. Default value is 19.



S36     V.42 NEGOTIATION FAILURE TREATMENT

        Range: 0-7      Unit: Decimal

        This register is read when the S48 register equals 128 or if an

        attempted V.42 connection fails. These fallback options are

        initiated immediately upon connection if S48=128.



S36=0   Modem Disconnects.

S36=1   Modem stays on-line and a Direct mode connection is established.

S36=2   Reserved.       

S36=3   Modem stays on-line and a Normal mode connection is established.

S36=4   An MNP connection is attempted and if fails, the modem disconnects.

S36=5   An MNP connection is attempted and if fails, a Direct mode

        connection is established.

S36=6   Reserved.        

S36=7   An MNP connection is attempted and if fails, a Normal mode

        connection is established. (Default)

                         

S37     DESIRED CONNECTION RATE

        Range: 0-21     Unit: Decimal

Note:1. When the Nn comand is issued or the S37 register value is modified,

        the +MS command subparameters are updated to reflect the speed and

        modulation specified by the S37 value (see +MS command). For example:

          

          If N0 command is active, S37=10 updates the +MS command

          subparameters to reflect +MS=10,0,300,12000



          If N1 command is active, S37=10 updates the +MS command

          subparameters to reflect +MS=10,1,300,12000



     2. S37 is not updated by the +MS command.



     3. Use of the +MS command is recommended instead of the Nn and S37=x

        commands. Nn and S37=x commands are supported for compatibility with

        existing communication software.



     4. If an invalid number is entered, the number is accepted into the

        register, but S37 will react as though the default value has been

        entered.





S37=0   Attempt auto mode connection        (DEFAULT)

S37=1-3 Attempt to connect at 300bps

S37=4   Reserved

S37=5   Attempt to connect at 1200bps       

S37=6   Attempt to connect at 2400bps       

S37=7   Attempt to connect at V.23  (Not supported by Zoltrix V.34)        

S37=8   Attempt to connect at 4800bps      

S37=9   Attempt to connect at 9600bps       

S37=10  Attempt to connect at 12Kbps 

S37=11  Attempt to connect at 14.4Kbps 

S37=12  Attempt to connect at 7200bps  



S38     DELAY BEFORE FORCED HANG UP

        Range: 0-255    Unit: Seconds

        This register specifies the delay between the modems receipt of

        the H command to disconnect (or ON-to-OFF transition of DTR if the

        modem is set to follow the signal), and the disconnect operation.

        Applicable to error-correction connection only! This register can

        be used to ensure that data in the modem buffer is sent before the

        modem disconnects.



1. If S38 is set to a value between 0 and 254, the modem will wait that 

   number of seconds for the remote modem to acknowledge all data in the

   modem buffer before disconnecting. If time expires before all data is

   sent, the NO CARRIER result code will be issued to indicate that data

   has been lost. If all data is transmitted prior to time-out, the response

   to the H0 command will be OK.



2. If S38 is set to 255, the modem does not time-out and continues to

   attempt to deliver data in the buffer until the connection is lost or

   the data is delivered.



S39       Bit Mapped                    Bit Mapped Registers.

S40       Bit Mapped                    Bit Mapped Registers.

S41       Bit Mapped                    Bit Mapped Registers.



S46     PROTOCOL SELECTION

        Range: 136 or 138  Unit: Decimal

        This register controls V.42bis compression.

S46=136 Disable V.42bis compression.

S46=138 Enable V.42bis compression.



S48     V.42 NEGOTIATION ACTION

        Range: 0,7 or 128  Unit: Decimal

        The V.42 negotiation process determines the capabilities of the

        remote modem. However, when the capabilities of the remote modem

        are known and negotiation is unnecessary,

        this process can be bypassed.



S48=0   Disables negotiation; bypass the detection and negotiation phases;

        and proceed with V.42 (LAPM).

S48=7   Enables negotiation.

S48=128 Disables negotiation; bypass the detection and negotiation phases;

        and proceed at once with the fallback action specified in S36.

        Can be used to force MNP.



S82     BREAK HANDLING OPTIONS

        S82 is included for compatibility purposes only, changing this

        register will not have any affect.



S86     CONNECTION FAILURE CAUSE CODE

        Range: 0,4,5,8,12,13,14  Unit: Decimal

        When the modem issues a NO CARRIER result code, a value is written

        to this S register to help determine the reason for the failed

        connection. S86 records the first event that contributes to a

        NO CARRIER message.





S86=0     Normal disconnect, no error occured.

S86=4     Loss of carrier.

S86=5     V.42 negotiation failed to detect an error-correcting modem at the

          other end.

S86=9     The modems could not find a common protocol.

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.



S95     EXTENTED RESULT CODES

        Range: 

        The bits in this register can be set to override some of the

        Wn command options. A bit set to 1 in this register will enable the

        corresponding result code regardless of the Wn setting.



Bit  Decimal Value  Function

0 =       1         CONNECT CODE indicates DCE speed instead of DTE speed.

1 =       2         Append /ARQ (automatic repeat request) to verbose

                    CONNECT XXXX result code if protocol is other than none.

2 =       4         Enable CARRIER XXXX result code.

3 =       8         Enable PROTOCOL XXXX result code.

5 =       32        Enable COMPRESSION result code.



Note: To enable more than one function, add up the decimal values of the

      function you want to enable.

Example:

      To enable CARRIER, PROTOCOL, COMPRESSION; You would add 32+8+4.

      The command to enable these Functions would be ATS95=44



RESULT CODES



Verbal      Numeric

Value       Value          Description



OK             0    Modem successfully executed a command line.



CONNECT        1    Connection made at 300 bps.



RING           2    Modem detected an incoming call.



NO CARRIER     3    Modem lost or could not detect a remote

                    carrier signal within the Register S7 time.



ERROR          4    Modem found an error in the command line.



CONNECT 1200   5    Modem established a connection 1200 at 1200

                    1200bps.



NO DIALTONE    6    Modem did not detect a dial tone within 5

                    seconds after going off-hook.



BUSY           7    Modem detected a busy signal.



NO ANSWER      8    Five seconds of silence was not detected

                    when using the @ command in the dial command line.



CONNECT 0600   9    Modem established a connection at 600 bps.



CONNECT 2400   10   Modem established a connection at 2400 bps.



CONNECT 4800   11   Modem established a connection at 4800 bps.



CONNECT 9600   12   Connection made at 9600 bps.





CONNECT 7200   13   Connection made at 7200 bps.



CONNECT 12000  14   Connection made at 12000 bps.



CONNECT 14400  15   Connection made at 14400 bps.



CONNECT 16800  59   Connection made at 16800 bps.



CONNECT 19200  16   Connection made at 19200 bps.

                    (If modem is set to respond with connect message that

                     indicates carrier rate, otherwise 

                     indicates software rate)



CONNECT 21600  61   Connection made at 21600 bps. 



CONNECT 24000  62   Connection made at 24000 bps. 



CONNECT 26400  63   Connection made at 26400 bps.



CONNECT 28800  64   Connection made at 28800 bps.
CONNECT 31200       Connection made at 31200 bps.
CONNECT 33600       Connection made at 33600 bps.



CONNECT 38400  17   Connection made at 38400 bps. (Indicates software rate)



CONNECT 57600  18   Connection made at 57600 bps. (Indicates software rate)



CONNECT 115200 19   Connection made at 115,200 bps.(Indicates software rate)



FAX            33   Fax detected. (Fax/Data answer mode)



DATA           35   Modem detected. (Fax/Data answer mode)



CARRIER 300    40   Carrier rate of 300 bps.



CARRIER 1200   46   Carrier rate of 1200 bps.



CARRIER 2400   47   Carrier rate of 2400 bps.



CARRIER 4800   48   Carrier rate of 4800 bps.



CARRIER 7200   49   Carrier rate of 7200 bps.



CARRIER 9600   50   Carrier rate of 9600 bps.



CARRIER 12000  51   Carrier rate of 12000 bps.



CARRIER 14400  52   Carrier rate of 14400 bps.



CARRIER 16800  53   Carrier rate of 16800 bps.



CARRIER 19200  54   Carrier rate of 19200 bps.



CARRIER 21600  55   Carrier rate of 21600 bps.



CARRIER 24000  56   Carrier rate of 24000 bps.



CARRIER 26400  57   Carrier rate of 26400 bps.



CARRIER 28800  58   Carrier rate of 28800 bps.
CARRIER 31200       Carrier rate of 31200 bps.
CARRIER 33600       Carrier rate of 33600 bps.



Note: The CARRIER Result Code must be enabled with S95 bit 2 or W1 commands.



COMPRESSION:   66        The modem has connected in MNP

CLASS 5                  class 5 and COMPRESSION message

                         reporting has been enabled.



COMPRESSION    67        The modem has connected in V.42bis

V.42bis                  and COMPRESSION message reporting has

                         been enabled.



COMPRESSION:   69        The modem has connected without data

NONE                     compression and COMPRESSION message

                         reporting has been enabled.



Note: The COMPRESSION Result Code must be enabled with S95 bit 5.



PROTOCOL:      76        Modem has connected without any

NONE                     form of error connection. (No MNP4 or V.42)



PROTOCOL:      77        Modem has connected in the V.42

LAPM                     LAPM mode of error correction.



PROTOCOL:      80        Modem has connected in the MNP 4

ALT                      mode of error correction.



The PROTOCOL Result Code must be enabled with S95 bit 3 or W1 commands.







Rockwell has also added a response appended to the CARRIER result code to

indicate that a V.FC connection has been established. Remember that the

Rockwell V.34 chipset also supports Rockwell's V.FC standard.

There is NOT a numeric equivalent for the CARRIER result code with the

appended /VFC.



Following is an example response when connecting to a V.FC modem: (S95=47)



CARRIER 21600/VFC



PROTOCOL: LAP-M



COMPRESSION: V.42BIS



CONNECT 21600/ARQ





Following is an example response when connecting to a V.34 modem: (S95=47)



CARRIER 21600



PROTOCOL: LAP-M



COMPRESSION: V.42BIS



CONNECT 21600/ARQ