*** AT COMMANDS ***

  A/       Repeat Last Command: This is the only command not preceded  by AT or
           ended with the ENTER key. This will cause the modem to execute the
           last AT command stored in the modems internal buffer.


  A        Answer command:  This command will cause the modem to immediately go
           into answer mode. The modem will go off hook and begin the answer
           handshake.


  Bn       ITU-T or Bell configuration.

           n = 0  Select ITU-T V.22 if the connection is 1200 bps and ITU-T
                  V.21 if  the connection is  at 300 bps.
         * n = 1  Selects Bell 212A  if the connection is at 1200 and  Bell
                  103J if the connection is at 300 bps.


  Dn      Dial command: This command will cause the modem to go off hook and
          dial. There several modifiers that effect this command.

          0 through 9   are the digits the modem will dial.
          *      Useable with tone dial only.
          #      Useable with tone dial only.
          L      Re-dial last number.
          P      Will cause the modem to pulse dial.
          T      Will cause the modem to tone dial.
          R      Will cause the modem to go into reverse originate mode.
          S=n    Will dial stored phone number. n = 0 to 3.
          W      Will cause the modem to go off hook and wait the amount of
                 time specified in the S6(W-class) or S7(US) register.
          ,      Will cause the modem to wait the amount of time specified in
                 the S8 register before it Will continue executing the rest of
                 the dialing string.
          !      Will cause the modem to go on then off hook for the time set
                 by the S29 register.
          @      Will cause the modem to wait the amount of time specified in
                 the S7 register followed by 5 seconds of silence before
                 continuing to execute the dial string.
          &      Wait for credit card dialing tone. Will wair for the amount of
                 time set by the S6(W-class) or S7(US model).
          ;      Will cause the modem to enter command mode without initiating
                 the hand shake tones.


  En      Echo mode

          n = 0  Does not echo AT commands to host.
         *n = 1  Does echo AT commands to host.


  Fn      Full or half duplex operation.

          n = 0  Half duplex
          n = 1  Full duplex


  Hn      Switch hook mode

         *n = 0  Modem goes on hook.
          n = 1  Modem goes off hook.


  In      Report hardware information.

          n = 0  Reports the product code.
          n = 1  Reports last digit of chechsum.
          n = 2  Preforms checksum check.
          n = 3  Reports firmware version.
          n = 4  Reports OEM identifier.
          n = 5  Reports country code.
          n = 6  Reports data pump and internal code version.
          n = 7  Reports the DAA code.


  Ln      Speaker volume control.

          n = 0  Low speaker volume.
         *n = 1  Low speaker volume.
          n = 2  Medium speaker volume.
          n = 3  High speaker volume.


  Mn      Speaker control.

          n = 0  Speaker is always off.
         *n = 1  Speaker is on until carrier is detected.
          n = 2  Speaker is always on.
          n = 3  Speaker is off during dialing and on until carrier is
                 detected.


  Nn      Automode Enable

          n = 0  Automode detection is disabled.
          n = 1  Automode detection is enabled.


  On      Go back into data mode when modem is on-line command mode.

          n = 0  Returns the modem back into data mode without hand shaking.
          n = 1  Returns the modem back into data with handshaking.


  Qn      Result codes

         *n = 0  Enable result codes to DTE.
          n = 1  Disable result codes to DTE.


  Sn?     Read the contents of status register Sn.
          Displays value of S-register n.


  Sn=x    Modify an S-register.

          n = S-register number
          x = value to set register to

          It assigns a value X to the status
          register N. They may be reset to the default values by issuing an
          '&F' or 'Z' command.


  Vn      Result code form
          n = 0  Result codes reported in a numeric form.
         *n = 1  Result codes reported in a verbose form.


  Wn      Data rate response

         *n = 0  Connect result reports DTE speed.
          n = 1  Connect result reports line speed, error correction and DTE
                 speed.
          n = 2  Connect result reports DCE speed.


  Xn      Result code options

          n = 0   Enables result codes 0-4 and 8 , detection of dial tone and
                  busy disabled.
          n = 1   Enables result codes 0-4 and connect XXXX, detection of  dial
                  tone and busy disabled.
          n = 2   Enables result codes 0-6, and connect XXX and detection of
                  busy is disabled.
          n = 3   Enables result codes 0-4, 8 and connect XXXX, detection of
                  dial tone and busy disabled.
         *n = 4   Enables all result codes and detection of dial tone and busy
                  enabled.



  Yn      Long space disconnect (remote disconnect)

         *n = 0  Disables long space disconnect.
          n = 1  Enables long space disconnect in non error correction mode.
                 The modem will send a space of 4 seconds befor disconnecting.
                 In non error correcting modem the modem will disconnect after
                 receipt of 1.6 seconds of silence.


  Zn      Resets modem

         *n = 0  Resets the modem and loads stored profile 0 to the modem.
          n = 1  Resets the modem and loads stored profile 1 to the modem.


  &Cn     Data carrier detect mode

          n = 0  DCD is always on.
         *n = 1  DCD reports the state of the remote carrier.


  &Dn     Data terminal ready mode

          n = 0  DTR drop is interpreted according &Q setting.
                 &Q0,&Q5,&Q6 forces DTR on.
                 &Q1,&Q4 modem will disconnect ofter DTR drop, auto answer is
                 not affected
                 &Q2,&Q3 modem will disconnect ofter DTR drop, auto answer is
                 disabled.
          n = 1  DTR drop is interpreted according &Q setting.
                 &Q0,&Q1,&Q4,&Q5,&Q6 modem returns to asynchronous command
                 state without disconnecting.
                 &Q2,&Q3 DTR drop causes modem to disconnect and disables
                 auto-answer.
         *n = 2  DTR drop is interpreted according &Q setting.
                 &Q0 through &Q6 DTR drop causes the modem to disconnect and
                 disables auto-answer.
          n = 3  DTR drop is interpreted according &Q setting.
                 &Q0,&Q1,&Q4.&Q5,&Q6 DTR drop causes the modem to do a soft
                 reset.
                 &Q2,&Q3 DTR drop will cause the modem to disconnect and is
                 disabled.


  &Fn     Loads the factory defaults settings to the modems active profile.
          n = 0   Restores factory configuration 0.
          n = 1   Restores factory configuration 1.


  &Gn     Guard tone , only works in ITU-T V.22 bis 1200 bps or 2400 bps.

         *n = 0   Disables guard tone.
          n = 1   Disables guard tone.
          n = 2   Sets guard tone to 1800 Hz.


  &Jn     Telephone jack selection

          n = 0   RJ-11/RJ-41S/RJ-45S
          n = 1   RJ-12/RJ-13


  &Kn     Flow control options

          n = 0   Disables the modems flow control.
         *n = 3   Sets the modem to hardware flow control (RTS/CTS).
          n = 4   Sets the modem to software flow control (XON/XOFF).
          n = 5   Enables transparent XON/XOFF flow control.
          n = 6   Enables both RTS/CTS and XON/XOFF flow control.


  &Ln     Leased-line or dialup line selection

          n = 0   Dialup operation
          n = 1   Leased-line


  &Mn     Asynchronous/Synchronous communication mode
                     selection
          n = 0   asynchronous
          n = 1   synchronous mode 1 - async dialing, then
                  switch to synchronous operation
          n = 2   synchronous mode 2 - stored number dialing
          n = 3   synchronous mode 3 - manual dialing


  &Pn     Dial pulse ratio

         *n = 0   Select 39%-61% make/brake ratio at 10 paulses per second.
                  (US and Canada standard)
          n = 1   Select 33%-67% make/brake ratio at 10 paulses per second.
          n = 2   Select 39%-61% make/brake ratio at 20 paulses per second.
          n = 3   Select 33%-67% make/brake ratio at 20 paulses per second.


  &Qn     Sync/Async mode

          n = 0   Selects direct asynchronous operation.
          n = 1   Selects synchronous connect with asynchronous off-line
                  command mode.
          n = 2   Selects synchronous connect with asynchronous off-line
                  command mode and enables DTR dialing of directory 0.
          n = 3   Selects synchronous connect with asynchronous off-line
                  command mode and enables DTR to act as talk/data switch.
          n = 4   Select autosync opperation.
         *n = 5   modem will try to connect using an error-corrected link.
          n = 6   Select asynchronous opperation in normal mode.


  &Rn     Requiest to Send/Clear to Send handling (sync mode only)

          n = 0   CTS (RS-232 pin 5) tracks RTS (pin4)
          n = 1   modem ignores RTS and turns CTS on when ready to receive
                  synchronous data


  &Sn     Data set ready options

         *n = 0   DSR is always on.
          n = 1   DSR is on when hand shaking and off when carrier is lost.


  &Tn     Modem test options

         *n = 0   End test.
          n = 1   Local analog loopback test.
          n = 3   Local digital loopback test.
          n = 4   Grants RDL test from remote system.
          n = 5   Denies RDL test from remote system.
          n = 6   Remote digital loopback test.
          n = 7   Remote digital loopback test with self test.
          n = 8   Local analog loopback test with self test.


  &V      View stored and active profiles.


  &Wn     Saves configuration into stored profiles.
          (The last DTE speed and parity are also stored)

         *n = 0   Saves configuration into stored profile 0.
          n = 1   Saves configuration into stored profile 1.


  &Xn     Select synchronous clock source

          n = 0   Select internal TXCLK.
          n = 1   Select external TXCLK from local DTE.
          n = 2   Select slave receive timing.


  &Yn     Selects which stored profile to be used on power up.

         *n = 0  Loads stored profile 0.
          n = 1  Loads stored profile 1.


  &Zn=x   Stores dial strings into modems memory.

          n = 0 to 3
          x = Dial string to be stored.


  %Cn     Data compression

          n = 0  Disabled
          n = 1  Enables MNP5 data compression
          n = 2  Enables V.42 bis data compression
         *n = 3  Enables V.42 bis and MNP data compression.


  %En     Enable/disable line Quality monitor and auto-retrain or fall
          fallback/ fall forward.

          n = 0  Disable line Quality monitor and auto-retrain.
          n = 1  Enabled line Quality monitor and auto-retrain.
         *n = 1  Enabled line Quality monitor and fallback/fall forward.


  \An     MNP block size

          n = 0   Maximum 64 characters.
         *n = 1   Maximum 128 characters.
          n = 2   Maximum 192 characters.
          n = 3   Maximum 256 characters.


  \Bn     Break length

          n = 0 to 9 ( 100 ms pre unit)

  \En     Data echo (returns data back to DTE)

          n = 0   Disable data echo
          n = 1   Enable data echo


  \Gn     Modem port flow control

          n = 0   Disable modem port flow control
          n = 1   Enable modem port flow control


  \Jn     COM port baud rate adjust

          n = 0   Disable COM port baud rate adjust
          n = 1   Enable COM port baud rate agjust


  \Kn     Break control options. What happens when a break is sent or received
          by the modem.

          Receives a break from DTE when modem is operating in data transfer
          mode.
          n = 0,2,4 Enters command state but does not send a break to the
                    remote modem.
          n = 1     Clears data buffers and sends break to remote modem.
          n = 3     immediately sends a break to the remote modem.
         *n = 5     Sends a break to remote modem in sequence with transmitted
                    data.
          Modem is in on-line command state and a \B is received.
          n = 0,1   Clears data buffers and sends a break to the remote modem.
          n = 2,3   Immediately sends a break to the remote modem.
         *n = 4,5   Sends a break to remote modem in sequence with transmitted
                    data.
          Receives a break from the remote modem durring a non-error correcting
          connection.
          n = 0,1   Clears data buffers and sends break to the DTE.
          n = 2,3   immediately sends a break to the DTE.
          n = 4,5   Sends a break to DTE in sequence with transmitted data.


  \Nn     Operating mode options.

          n = 0    Buffer mode (normal mode). No data compression or error
                   correction and uses speed buffering.Forces &Q6.
          n = 1    Serial interface selected - Selects direct mode and is
                   equivalent to &M0,&Q0. Forces &Q0.
          n = 2    LAPM and MNP mode. First tries to connect using LAPM then
                   tries connecting with MNP error correction or makes no
                   connection at all.
          n = 3    Same as \N2 except if it fails to make an MNP or LAPM
                   connection it will try a connection in normal mode.
                   connect however possible.
          n = 4    LAPM error correcting mode. If modem can not make a
                   connection With LAPM error correction it will disconnect.
          n = 5    MNP error correcting mode. If modem can not make a
                   connection With MNP error correction it will disconnect.


  \Qn     Bi-directional   hardware  flow  control

          n = 3    CTS/RTS  modem flow  control
         

  +MS     Select Modulation. This command is used to select a specific
          modulation, automode, minimum connect rate, maximun connect rate,
          codec type, and robbed bit signalingdetection.
          Format +MS+<MOD>,<AUTOMODE>,<MIN RATE>,<MAX RATE>,<CODEC>,<RB SIGNAL>
          Modulation options: 0=V.21
                              1=V.22
                              2=V.22 bis     These options sets the type of
                              3=V.23         modulation you want the modem to
                              9=V.32         use.
                             10=V.32 bis
                             11=V.34
                             56=K56flex
                             64=Bell 103
                             69=Bell 212

          Automode options: 0=disabled
                            1=enabled,This will let the modem automaticly set
                                      its modulation to match the remote modem.

          Minimum connect rate: Sets the lowest connect rate the modem will
                                try to connect at. Can be set from 300 on up.

          Maximum connect rate: Sets the fastest connect rate the modem will
                                try to connect at. Can be set from 300 on up.

          Codec options: *0=u-Law
                          1=A-Law

          Robbed bit signaling detection options: *0=disabled
                                                   1=enabled


  #Bn     Fax speed control

          n = 0    Reserved
          n = 1    Reserved
          n = 2    Reserved for V.23
          n = 3    Reserved for V.23
          n = 4    Fax transmission speed of 2400 bps
          n = 5    Fax transmission speed of 4800 bps
          n = 6    Fax transmission speed of 7200 bps
          n = 7    Fax transmission speed of 9600 bps


  #En     Received frame display format selection

          n=0      Disable display of received HDLC frames
          n=1      Display frame in binary format
          n=2      Display frame in 2 digit ASCII Hex format


  #Fn     Mode control

        * n = 0    Return to normal modem mode (300 to 2400 bps data rate)
          n = 1    Enter Fax mode (19,200 bps data rate)


  #Pn     Number of pages to be transmitted

          n = 0 to 255)


  #Rn     Fax resolution control

        * n = 0    Send document with normal resolution
          n = 1    Send document with fine resolution

  #Tn     Fax test mode

          n = 0    End test mode
          n = 1    Enter test mode 1. This mode is used to dial a remote fax
                   machine and automatically send a message stored in EPROM

  * = Defaule value for a given AT command.


                       *** S RERGISTERS FOR MODEM BLASTER ***

  S0           Number of rings needed to auto answer: Sets the number of rings
               needed to make the modem perform an auto answer.
               default=0  Range 0-255


  S1           Ring Counter: Records the number of rings the modem has
               detected. Resets to 0 if no rings are detected in 8 seconds.
               default=0  range 0-255


  S2           Escape Character:Decimal number representing an ASCII character.
               default=43 (ASCII +)   range 0-127


  S3           Carriage Return Character: Decimal number representing an ASCII
               character.
               default=13 (ASCII enter)  range 0-127


  S4           Line Feed Character:  Decimal number representing an ASCII
               character.
               default=10(ASCII line feed)  range 0-127


  S5           Back Space Character: Decimal number representing an ASCII
               character.
               default=8(ASCII back space)  range 0-127


  S6           Wait Time Before Blind Dialing:  Number of seconds after the
               modem goes off hook before it will dial.
               default=2  range is 2-255 sec.


  S7           Wait Time For Carrier Detect, for silence or for Dial Tone after
               the W dial modifier: This sets the amount of time the modem will
               wait for theremote carrier befor disconnecting. The amount of
               time the modem will wait for silence after the @ dial modifier.
               Sets the amount of time the modem will wait for dialtone after
               the (W) dial modifier.
               default=50  range 1-255 sec.


  S8           Pause Time for Dial delay:
               The amount of time the (,) will cause the modem to pause.
               default=2  range0-255sec.


  S9           Carrier Detect Resopnce Time: The amount of time the carrier
               must be present before the modem will recognize it.
               default=6  range 1-255 1/10 of a sec.



  S10          Hang Up Delay After Loss of  Carrier:  The amount of time after
               the remote carrier is lost before this modem will disconnect.
               default=14  range 1-255 1/10 of a sec.


  S11          DTMF Dialing Speed:  Determines the length of the dual dialing
               tones.
               default=95  range 50-255 ms.


  S12          Escape prompt delay: Sets the amount of time betweem the last
               character in the escape sequence befor an OK will be sent.
               default=50  range 0-255 1/50 of a sec.


  S13          Reserved


  S14          Bit-mapped      AA(hex)  modem options   (Hayes)
    7  6  5  4  3  2  1  0
   +--+--+--+--+--+--+--+--+
   |  |  |  |  |  |  |  |  | Bit:
   ++-++-++-++-++-++-++-++-+ ---
    |  |  |  |  |  |  |  +-> 0: Reserved
    |  |  |  |  |  |  +----> 1: echo command 0=no echo
    |  |  |  |  |  |                         1=echo
    |  |  |  |  |  +-------> 2: Result codes 0=enabled
    |  |  |  |  |                            1=disabled
    |  |  |  |  +----------> 3: verbose mode 0=short form result codes
    |  |  |  |                               1=verbode result codes
    |  |  |  +-------------> 4: dumb mode    0=modem acts smart
    |  |  |                                  1=modem acts dumb
    |  |  +----------------> 5: dial method  0=tone
    |  |                                     1=pulse
    |  +-------------------> 6: reserved
    +-------------> 7: originate/answer mode 0=answer
                                             1=originate


  S15          Reserved


  S16          bit-mapped      modem test options        (Hayes)
    7  6  5  4  3  2  1  0
   +--+--+--+--+--+--+--+--+
   |  |  |  |  |  |  |  |  | Bit:
   ++-++-++-++-++-++-++-++-+ ---
    |  |  |  |  |  |  |  +-> 0: local analog loopback:   0=disabled
    |  |  |  |  |  |  |                                  1=enabled
    |  |  |  |  |  |  +----> 1: reserved
    |  |  |  |  |  |
    |  |  |  |  |  +-------> 2: local digital loopback:  0=disabled
    |  |  |  |  |                                        1=enabled
    |  |  |  |  +----------> 3: status bit:              0=loopback off
    |  |  |  |                                           1=loopback in progress
    |  |  |  +---> 4: initiate remote digital loopback:  0=disabled
    |  |  |                                              1=enabled
    |  |  |
    |  |  +------> 5: initiate remote digital loopback with test
    |  |                       message and error count:  0=disabled
    |  |                                                 1=enabled
    |  +-----> 6: local analog loopback with self test:  0=disabled
    |                                                    1=enabled
    +----------------------> 7: reserved


  S17          Reserved

  S18          Duration of Modem Tests: Sets the length of the &T tests.
               default=0   range 0-255 sec.

  S19          Reserved

  S20          Reserved


  S21   bit-mapped                modem options    (Hayes)

    7  6  5  4  3  2  1  0
   +--+--+--+--+--+--+--+--+
   |  |  |  |     |  |  |  | Bits:
   ++-++-++-+--+--++-++-++-+ -----
    |  |  |    |   |  |  +-> 0: Telco jack used:  0= RJ-11/RJ-41S/RJ-45S
    |  |  |    |   |  |                           1= RJ-12/RJ-13
    |  |  |    |   |  +----> 1: Reserved
    |  |  |    |   +-------> 2: RTS/CTS handling: 0= RTS follows CTS
    |  |  |    |                                  1= CTS always ON
    |  |  |    +-----------> 3-4: DTR handling:  00=modem ignores DTR
    |  |  |
    |  |  |                                      01=modem to command state when
    |  |  |                                         DTR goes OFF
    |  |  |                                      10=modem hangs up when DTR
    |  |  |                                         goes OFF
    |  |  |                                      11=modem initializes when DTR
    |  |  |                                         goes OFF
    |  |  +----------------> 5: DCD handling:    0=DCD always on
    |  |                                         1=DCD indicates presence of
    |  |                                           carrier
    |  +-------------------> 6: DSR handling:    0=DSR always on
    |                                            1=DSR indicates modem is off-
    |                                              hook and in date mode
    +----------------> 7: long space disconnect: 0=disabled
                                                 1=enabled



  S22   bit-mapped       default 76(Hex) modem option register (Hayes)

    7  6  5  4  3  2  1  0
   +--+--+--+--+--+--+--+--+
   |  |        |     |     | Bits:
   ++-+--++-+--+--+--+--+--+ -----
    |     |       |     +--> 0-1: speaker volume:  00=low
    |     |       |                                01=low
    |     |       |                                10=medium
    |     |       |                                11=high
    |     |       +--------> 2-3: speaker control: 00=speaker disabled
    |     |                                        01=apkr is on until carrier
    |     |                                           detected
    |     |                                        10=speaker is always on
    |     |                                        11=apkr is on between dialind
    |     |                                           and carrier detect
    |     +-----------> 4-6: result code options: 000=300 baud modem result
    |                                                     codes only
    |                                             100=modem does not detect
    |                                                 dialtone or busy
    |                                             101=modem detects dialtone only
    |                                             110=modem detects only busy
    |                                                 signal
    |                                             111=modem detects dialtone and
    |                                                 busy, other settings
    |                                                 undefined
    +------------> 7: make/break pulse dial ratio:  0=39% make, 61% break
                                                    1=33% make, 67% break


  S23  bit-mapped    modem option register   (Hayes)

    7  6  5  4  3  2  1  0
   +--+--+--+--+--+--+--+--+
   |     |     |  |     |  | Bits:
   +--+--+--+--++-+--+--++-+ -----
      |     |   |    |   +-> 0: obey request from remote
      |     |   |    |          modem for remote digital
      |     |   |    |          loopback:                0=disabled
      |     |   |    |                                   1=enabled
      |     |   |    |
      |     |   |    +---> 1-2: communication rate:   00=0 to 300 bps
      |     |   |                                     01=reserved
      |     |   |                                     10=1200 bps
      |     |   |                                     11=2400 bps
      |     |   +-------->   3: reserved
      |     +------------> 4-5: parity option:        00=even
      |                                               01=space
      |                                               10=odd
      |                                               11=mark/none
      +------------------> 6-7: guard tones:          00=disabled
                                                      01=550 Hz guard tone
                                                      10=1800 Hs guard tone
                                                      11=reserved




  S24          Reserved


  S25          Detect DTR Change:  This sets the amount of time that the DTR
               must be off before the &D command will de executed.
               default=5   range 0-255 1/100 of a sec.

  S26          RTS to CTS delay:  Sets the lenght of time befor the modem will
               turn on CTS after the modem detects an on to off transition of
               RTS. Synchronous mode only.
               default=1   range 0-255 1/100 of a sec.


  S27  bit-mapped  Default 40(Hex)    Modem options register (Hayes)

    7  6  5  4  3  2  1  0
   +--+--+--+--+--+--+--+--+
   |  |  |     |  |  |     | Bits:
   ++-++-+--+--++-++-+--+--+ -----
    |  |    |   |  |    +--> 0-1: transmission mode: 00=asynchronous
    |  |    |   |  |                                 01=synchronous with async
    |  |    |   |  |                                    call placement
    |  |    |   |  |                                 10=synchronous with stored
    |  |    |   |  |                                    number dialing
    |  |    |   |  |                                 11=synchronous with manual
    |  |    |   |  |                                    dialing
    |  |    |   |  +---------> 2: dialup or lease-line
    |  |    |   |                      operation:    0=dialup line
    |  |    |   |                                    1=leased-line
    |  |    |   +------------> 3: reserved
    |  |    +----> 4-5: source of synchronous clock:00=local modem
    |  |                                            01=host computer ot data
    |  |                                               terminal
    |  |                                            10=derived from received
    |  |                                               carrier
    |  |                                            11=reserved
    |  |
    |  +------------> 6:   Bell or CCITT operation: 0=CCITT v.22 bis/v.22
    |                                               1=Bell 212A
    +------------------------> 7: reserved



  S29          Flash Dial Modifier time:  sets the lenght of time that the
               modem will go on hook after encountering the (!) dial modifier.
               default=70   range 0-255 1/100 of a sec.


  S30          Inactivity Timer:  This sets the amount of time that the modem
               will stay connected if no data is being transferred. When set to
               zero timer is disabled.
               default=0   range 0-255 10 seconds


  S32          XON Character:  Sets the value of the XON character.
               default=17(11h)   range 0-255 ASCII


  S33          XOFF Character:  Sets the value of the XOFF character.
               default=19(13h)   range 0-255 ASCII


  S36          This value indicates what happens durring a LAPM failure.The S48
               register must be set to 128 for this command to be actine.
               0 = Modem will disconnect.
               1 = Modem will stay online and a direct mode connection is made.
               3 = Modem will stay online and a normal mode connection is made.
               4 = An MNP connection is attempted, if failed modem disconnects.
               5 = An MNP connection is attempted, if failed then a dirrect
                   mode connection is established.
               7 = An MNP connection is attempted, if failed then a normal mode
                   connection is established.


  S48          Allows your modem to bypass negotiation. You must know the
               remote Modems capabilities.
               0   = Disable negotiation, and connects with LAPM.
               7   = Enables negotiation. (default)
               128 = disables negotiation and uses fallback action set by the
                     S36 register.


  S86          Call Failure Reason: Check this register to see why your modem
               disconnected.
               0  = Normal disconnect, No errors.
               4  = Loss of carrier.
               5  = V.42 failed to detect an error correcting modem at the
                    other end.
               9  = The modem could not find a common protocol.
               12 = Normal disconnect initiated by the remote modem.
               13 = Remote modem does not respond after 10 retransmissions
                    of the same data.
               14 = Protocol violation.


  S91          PSTN Transmit Attenuation Level:
               default=10 (-10dBm transmit level)    range 0-15


  S92          Fax Transmit Attenuation Level:
               default=10 (-10dBm transmit level)    range 0-15


                *** RESPONCE CODES FOR MODEM BLASTER ***

               0 = OK
               1 = CONNECT
               2 = RING
               3 = NO CARRIER
               4 = ERROR
               5 = CONNECT 1,200
               6 = NO DIALTONE
               7 = BUSY
               8 = NO ANSWER
               9 = CONNECT 0600
              10 = CONNECT 2400
              11 = CONNECT 4800
              12 = CONNECT 9600
              13 = CONNECT 7200
              14 = CONNECT 12000
              15 = CONNECT 14400
              16 = CONNECT 19200
              17 = CONNECT 38400
              18 = CONNECT 57600
              19 = CONNECT 115200
              20 = CONNECT 230400
              22 = CONNECT 75TX/1200RX
              23 = C0NNECT 1200TX/75RX
              24 = DELAYED
              32 = BLACKLISTED
              33 = FAX
              35 = DATA
              40 = CARRIER 300
              44 = CARRIER 1200/75
              45 = CARRIER 75/1200
              46 = CARRIER 1200
              47 = CARRIER 2400
              48 = CARRIER 4800
              49 = CARRIER 7200
              50 = CARRIER 9600
              51 = CARRIER 12000
              52 = CARRIER 14400
              53 = CARRIER 16800
              54 = CARRIER 19200
              55 = CARRIER 21600
              56 = CARRIER 24000
              57 = CARRIER 26400
              58 = CARRIER 28800
              59 = CONNECT 16800
              61 = CONNECT 21600
              62 = CONNECT 24000
              63 = CONNECT 26400
              64 = CONNECT 28800
              66 = COMPRESSION:CLASS5
              67 = COMPRESSION:V.42 bis
              69 = COMPRESSION:NONE
              70 = PROTOCOL:NONE
              77 = PROTOCOL:LAPM
              78 = CARRIER 31200
              79 = CARRIER 33600
              80 = PROTOCOL:ALT
              81 = PROTOCOL:ALT-CELLULAR
              84 = CONNECT 33600
              91 = CONNECT 31200
             150 = CARRIER 32000
             151 = CARRIER 34000
             152 = CARRIER 36000
             153 = CARRIER 38000
             154 = CARRIER 40000
             155 = CARRIER 42000
             156 = CARRIER 44000
             157 = CARRIER 46000
             158 = CARRIER 48000
             159 = CARRIER 50000
             160 = CARRIER 52000
             161 = CARRIER 54000
             162 = CARRIER 56000
             165 = CONNECT 32000
             166 = CONNECT 34000
             167 = CONNECT 36000
             168 = CONNECT 38000
             169 = CONNECT 40000
             170 = CONNECT 42000
             171 = CONNECT 44000
             172 = CONNECT 46000
             173 = CONNECT 48000
             174 = CONNECT 50000
             175 = CONNECT 52000
             176 = CONNECT 54000
             177 = CONNECT 56000
             +F4 = +FCERROR

                          *** FAX RESULT CODES ***

  During the Fax session the hardware will report the status of the
  call with result codes.  An action by the software may or may not
  be necessary depending on the response.

  All the normal Hayes result codes will also be reported.
  +-----------------+-----+---------------------------------------+
  |    Verbose      |Digit|      Usage                            |
  +-----------------+-----+---------------------------------------|
  |CSI              |  -  | Remote machine Identification         |
  |                 |     |                                       |
  |CED              |  a  | Ansertone detected                    |
  |                 |     |                                       |
  |DIS              |  b  | Remote machine capabilities frame     |
  |                 |     |                                       |
  |CRP              |  c  | Repeat request                        |
  |                 |     |                                       |
  |DCN              |  d  | Disconnect                            |
  |                 |     |                                       |
  |CRC ERROR        |  e  | Error in received frame               |
  |                 |     |                                       |
  |FTT              |  f  | Failure to train                      |
  |                 |     |                                       |
  |CFR              |  g  | Remote machine confirmation to receive|
  |                 |     |                                       |
  |RTN              |  h  | Message not received OK               |
  |                 |     |                                       |
  |INVALID FRAME    |  i  | Received frame is invalid             |
  |                 |     |                                       |
  |RTP              |  j  | Retrain positive                      |
  |                 |     |                                       |
  |MCF              |  m  | Message received OK                   |
  |                 |     |                                       |
  |CONNECT 2400/FAX |  w  | Connection speed 2400 bps             |
  |                 |     |                                       |
  |CONNECT 4800/FAX |  x  | Connection speed 4800 bps             |
  |                 |     |                                       |
  |CONNECT 7200/FAX |  y  | Connection speed 7200 bps             |
  |                 |     |                                       |
  |CONNECT 9600/FAX |  z  | Connection speed 9600 bps             |
  +-----------------+-----+---------------------------------------+

                            Used documentation:
  1. AT COMMANDS SET FOR MODEM BLASTER.  VER 1.1  4/97   atcomm.txt
  2. What You Need to Know about Modems.    appendix.a ; appendix.b
  3. Модемы МТ224BA/BAF, 224EC7B.                         mt224.doc
  4. FaxModem commands (from Fidonet)                  faxmodem.txt
  5. Настройка модемов MNP5/V42b.                      optimv42.txt