
U.S. ROBOTICS, INC.

SPORTSTER 28,800 EXTERNAL

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     External
Fax Class                    Class I & II
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.22, V.22bis, V.23, V.32, V.32bis,
                             V.25
Fax Modulation Protocol      ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression MNP5, V.42, V.42bis

[Image]

                                CONNECTIONS

         Purpose             Location          Purpose           Location

  Line out                     CN3       DC power                  CN1

  Line in                      CN4       Volume                    R1

  RS-232/422                   CN2       Power switch              SW2

              DTR SIGNAL

  Setting                SW1/1

   DTR normal            Off

  DTR forced high          On

                           RESULT CODES

  Setting                                     SW1/2

   Verbal result codes enabled                Off

  Numeric result codes enabled                  On

   RESULT CODES DISPLAY

  Setting       SW1/3

   Enabled       On

  Disabled       Off

       ECHO DISPLAY

  Setting       SW1/4

   Enabled      Off

  Disabled        On

        AUTO ANSWER

  Setting         SW1/5

   Disabled       On

  Enabled          Off

           CARRIER DETECT

  Setting               SW1/6

   CD normal            Off

  CD forced high         On

           SOFTWARE RESET

     Setting            SW1/7

   CD normal            Off

  CD forced high         On

     AT COMMAND SET

  Setting      SW1/8

  Enabled       On

  Disabled      Off

                             DIAGNOSTIC LED(S)

     LED       Color      Status       Mode             Condition

     AA         Red         On        Answer       Auto-answer enabled

     AA         Red        Off         N/A        Auto-answer disabled

     AA         Red      Blinking      N/A          Phone is ringing

     CD         Red         On         N/A       Carrier signal detected

     CD         Red        Off         N/A          Carrier signal not
                                                        detected

     RD         Red      Blinking      N/A       Modem is receiving data
                                                 or sending result codes

     RD         Red        Off         N/A        Modem is not receiving
                                                          data

     SD         Red      Blinking      N/A        Modem is transmitting
                                                          data

     SD         Red        Off         N/A      Modem is not transmitting
                                                          data

     TR         Red         On         N/A         DTR signal is high

     TR         Red        Off         N/A          DTR signal is low

     CS         Red         On         N/A              CTS high

     CS         Red        Off         N/A             CTS normal

   ARQ/FAX      Red         On         Data      Error control connection
                                                       established

   ARQ/FAX      Red      Blinking      Data       Error control data is
                                                    being transmitted

   ARQ/FAX      Red      Blinking      Fax      Modem is connected in FAX
                                                          mode

                         Proprietary AT Command Set

                          BIT-MAPPED REGISTER S13

  Format:              AT [cmds] S13=n [cmds]

  Example:             ATS13=13<CR>

  Default:             0

  Range:               0 - 89

  Unit:                Bit-mapped

  Description:         Controls DTR reset, DTR dialing, reset dialing,
                       and MNP3.

     Bit       Value                         Function

      0         0        DTR normal.

               1          Reset on low DTR.

      1         0        Not used.

      2         0        Not used.

      3         0        DTR dialing disabled.

               1          DTR dialing enabled.

      4         0        Reset dialing disabled.

               1          Reset dialing enabled.

      5         0        Not used.

      6         0        MNP 3 enabled.

               1          MNP 3 disabled.

      7         0        Not used.

                          BIT-MAPPED REGISTER S15

  Format:               AT [cmds] S15=n [cmds]

  Example:              ATS15=13<CR>

  Default:              0

  Range:                0 - 56

  Unit:                 Bit-mapped

  Description:          Controls non-error-correcting mode buffer, MNP4,
                        and BS/DEL switch.

     Bit        Value                         Function

      0          0        Not used.

      1          0        Not used.

      2          0        Not used.

      3          0        Non-error-correcting mode transmit buffer set
                           to 1.5KB.
                1
                           Non-error-correcting mode transmit buffer set
                           to 128 bytes.

      4          0        MNP 4 enabled.

                1          MNP 4 disabled.

      5          0        Use backspace key for delete disabled.

                1          Use backspace key for delete enabled.

                          BIT-MAPPED REGISTER S27

  Format:                   AT [cmds] S27=n [cmds]

  Example:                  ATS27=139<CR>

  Default:                  0

  Range:                    0 - 191

  Unit:                     Bit-mapped

  Description:              Controls V.21, V.32 encoding and modulation,
                            V.42 answer tone and handshake, and 9600
                            result codes.

        Bit          Value                      Function

         0            0        V.21 disabled.

                     1          V.21 enabled.

         1            0        V.32 trellis coding disabled.

                     1          V.32 trellis coding enabled.

         2            0        V.32 modulation enabled.

                     1          V.32 modulation disabled.

         3            0        2100Hz answer tone enabled.

                     1          2100Hz answer tone disabled.

       5, 4           00       V.42 detect, LAPM and MNP enabled.

                     01         V.42 detect and LAPM enabled.

                     10         MNP enabled.

                     11         LAPM enabled.

         6            0        Not used.

         7            0        Actual result codes displayed.

                     1          Force 9600 result codes.

                     COMPRESSION AND ERROR CORRECTION

  Format:               AT [cmds] S51=n [cmds]

  Example:              ATS51=3<CR>

  Default:              0

  Range:                0 - 7

  Unit:                 Bit-mapped

  Description:          Selects compression and error correction for
                        specific modulations.

     Bit        Value                         Function

      0          0        MNP/V.42 enabled during V.22 operation.

                1          MNP/V.42 disabled during V.22 operation.

      1          0        MNP/V.42 enabled during V.22bis operation.

                1          MNP/V.42 disabled during V.22bis operation.

      2          0        MNP/V.42 enabled during V.32bis operation.

                1          MNP/V.42 disabled during V.32bis operation.

                          BIT-MAPPED REGISTER S56

  Format:                    AT [cmds] S56=n [cmds]

  Example:                   ATS56=139<CR>

  Default:                   0

  Range:                     0 - 223

  Unit:                      Bit-mapped

  Description:               Controls non-linearing coding, TX level
                             deviation, pre-emphasis, pre-coding,
                             shaping, V.34, and V.FC.

        Bit          Value                      Function

         0            0        Non linearing coding enabled.

                     1          Non linearing coding disabled.

         1            0        TX level deviation enabled.

                     1          TX level deviation disabled.

         2            0        Pre-emphasis enabled.

                     1          Pre-emphasis disabled.

         3            0        Pre-coding enabled.

                     1          Pre-coding disabled.

         4            0        Shaping enabled.

                     1          Shaping disabled.

         5            0        Not used.

         6            0        V.34 enabled.

                     1          V.34 disabled.

         7            0        V.FC enabled.

                     1          V.FC disabled.

                               BREAK LENGTH

  Type:           Register

  Format:         AT [cmds] S21=n [cmds]

  Example:        ATS21=20<CR>

  Default:        10

  Range:          0-255

  Unit:           10 ms

  Description:    Sets the length of error correction mode breaks sent
                  from DCE to DTE in ARQ mode.

                                BREAK TYPE

  Type:          Configuration

  Format:        AT [cmds] &Yn [cmds]

  Example:       AT &Y0<CR>

  Description:   Configures action of break signal.

  Command                                Function

  &Y0            Break empties buffer.

   &Y1          Break empties buffer and is sent immediately.

  &Y2            Break does not empty buffer and is sent immediately.

                       CONNECTION SPEED UPPER LIMIT

  Type:              Configuration

  Format:            AT [cmds] &Nn [cmds]

  Example:           AT &N1 DT555-1212<CR>

  Description:       Sets required connection speed if &U is set to 0.
                     Otherwise, sets fastest allowed connection speed.

  Command                                  Function

   &N0              Variable.

  &N1                300bps

  &N2                1200bps

  &N3                2400bps

  &N4                4800bps

  &N5                7200bps

  &N6                9600bps

  &N7                12Kbps

  &N8                14.4Kbps

  &N9                16.8Kbps

  &N10               19.2Kbps

  &N11               21.6Kbps

  &N12               24Kbps

  &N13               26.4Kbps

  &N14               28.8Kbps

                       CONNECTION SPEED LOWER LIMIT

  Type:          Configuration

  Format:        AT [cmds] &Un [cmds]

  Example:       AT &U1 DT555-1212<CR>

  Description:   Sets slowest allowed connection speed if &N is set to 1
                 or higher.

  Command                                Function

   &U0          Disabled.

  &U1            300bps

  &U2            1200bps

  &U3            2400bps

  &U4            4800bps

  &U5            7200bps

  &U6            9600bps

  &U7            12000bps

  &U8            14400bps

  &U9            16800bps

  &U10           19200bps

  &U11           21600bps

  &U12           24000bps

  &U13           26400bps

  &U14           28800bps

                            ERROR CONTROL MODE

  Type:          Configuration

  Format:        AT [cmds] &Mn [cmds]

  Example:       AT &M1 %C1<CR>

  Description:   Selects active error-control protocols.

  Command                                Function

  &M0            Normal mode, error control disabled.

   &M4          Normal/ARQ.

  &M5            ARQ mode.

                         ESCAPE CHARACTER RESPONSE

  Type:              Register

  Format:            AT [cmds] S14=n [cmds]

  Example:           ATS14=0<CR>

  Default:           0

  Description:       Controls reaction to escape character.

  Command                                  Function

   S14=0            Normal operation.

  S14=1              When +++ is received, modem goes on hook, enters
                     command state and sends NO CARRIER result code.

                           EXTENDED RESULT CODES

  Type:          Configuration

  Format:        AT [cmds] &An [cmds]

  Example:       AT &A1 %C1<CR>

  Description:   Selects extended result codes.

  Command                                Function

  &A0            Extended result codes disabled.

  &A1            ARQ result codes enabled.

  &A2            V.32 result code enabled.

   &A3          Error correction and compression result codes enabled.

                       FLOW CONTROL CHARACTER - XON

  Type:          Register

  Format:        AT [cmds] S22=n [cmds]

  Example:       ATS22=20<CR>

  Default:       17

  Range:         0-127

  Unit:          ASCII

  Description:   Sets the character used to represent XON.

                       FLOW CONTROL CHARACTER - XOFF

  Type:          Register

  Format:        AT [cmds] S23=n [cmds]

  Example:       ATS23=20<CR>

  Default:       19

  Range:         0-127

  Unit:          ASCII

  Description:   Sets the character used to represent XOFF.

                         FLOW CONTROL PASSTHROUGH

  Type:          Configuration

  Format:        AT [cmds] &In [cmds]

  Example:       AT &I0 &W<CR>

  Description:   Allows modem to act on, then transmit XON/XOFF
                 characters.

  Command                                Function

   &I0          Software flow control disabled.

  &I1            XON/XOFF passthrough enabled.

  &I2            XON/XOFF passthrough disabled.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] &Hn [cmds]

  Example:       AT &H0 A<CR>

  Description:   Sets type of flow control used by modem.

  Command                                Function

  &H0            Flow control disabled.

   &H1          CTS/RTS flow control enabled.

  &H2            XON/XOFF flow control enabled.

  &H3            CTS/RTS and XON/XOFF flow control enabled.

                               HELP SCREENS

  Type:                Immediate

  Format:              AT <prefix>$

  Example:             AT &$<CR>

  Description:         Shows command help screens for all commands
                       beginning with the given prefix, or no prefix if
                       none is given.

       Command                              Function

          $            Shows AT help screen.

         &$            Shows AT& help screen.

                             INACTIVITY TIMER

  Type:             Register

  Format:           AT [cmds] S19=n [cmds]

  Example:          ATS19=20<CR>

  Default:          0

  Range:            Unidentified

  Unit:             1 minute

  Description:      Sets the length of time that the modem does not
                    receive information before it disconnects.

                             LOCK SERIAL PORT

  Type:          Configuration

  Format:        AT [cmds] &Bn [cmds]

  Example:       AT &N9 &B0<CR>

  Description:   Sets operation of serial port speed.

  Command                                Function

  &B0            Serial speed follows connect speed.

   &B1          Serial speed locked.

  &B2            Serial speed locked in ARQ mode only.

                                  MAPPING

  Format:             AT [cmds] S55=n [cmds]

  Example:            ATS55=13<CR>

  Default:            0

  Range:              0 - 15

  Unit:               Bit-mapped

  Description:        Controls mapping.

     Bit        Value                       Function

      0         0      8S-2D map enabled.

               1        8S-2D map disabled.

      1         0      16S-4D map enabled.

               1        16S-4D map disabled.

      2         0      32S-2D map enabled.

               1        32S-2D map disabled.

      3         0      64S-4D map enabled.

               1        64S-4D map disabled.

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Example:       AT I1 O<CR>

  Description:   Displays modem properties.

    Command                              Function

       I0        Reports product code.

       I1        Reports ROM checksum result.

       I2        Reports RAM checksum result.

       I3        Reports firmware version.

       I4        Reports current command settings.

       I5        Reports current NVRAM settings.

       I6        Reports current connections statistics.

       I7        Reports configuration.

                                 BAUD RATE

  Format:             AT [cmds] S54=n [cmds]

  Example:            ATS54=139<CR>

  Default:            0

  Range:              0 - 255

  Unit:               Bit-mapped

  Description:        Controls baud rate.

     Bit        Value                       Function

      0         0      2400 baud rate enabled.

               1        2400 baud rate disabled.

      1         0      2743 baud rate enabled.

               1        2743 baud rate disabled.

      2         0      2800 baud rate enabled.

               1        2800 baud rate disabled.

      3         0      3000 baud rate enabled.

               1        3000 baud rate disabled.

      4         0      3200 baud rate enabled.

               1        3200 baud rate disabled.

      5         0      3429 baud rate enabled.

               1        3429 baud rate disabled.

      6         0      Call indicate during V.34 operation enabled.

               1        Call indicate during V.34 operation disabled.

      7         0      V.8 during V.34 operation enabled.

               1        V.8 during V.34 operation disabled.

                             TONE DIALING TEST

  Type:          Register

  Format:        AT [cmds] S16=n [cmds]

  Example:       ATS16=1<CR>

  Description:   Selects the tone dialing test

  Command                                Function

   S16=0        Tone dialing test disabled.

  S16=1          Tone dialing test enabled.

                       V.32 AND V.32bis MODULATIONS

  Format:             AT [cmds] S34=n [cmds]

  Example:            ATS34=13<CR>

  Default:            6

  Range:              0 - 15

  Unit:               Bit-mapped

  Description:        Controls V.32 and V.32bis modulations.

     Bit        Value                       Function

      0         0      V.32bis enabled.

               1        V.32bis disabled.

      1         1      Not used.

      2         1      Not used.

      3         0      V.32 modulation disabled.

               1        V.32 modulation enabled.

                            V.32 HANDSHAKE TIME

  Type:          Register

  Format:        AT [cmds] S28=n [cmds]

  Example:       ATS28=20<CR>

  Default:       8

  Range:         0-255

  Unit:          .1 second

  Description:   Sets length of V.32 handshake.

