
U.S. ROBOTICS, INC.

COURIER HST

Modem Type                   Data (synchronous/asynchronous)
Maximum Data Rate            9600bps
Data Bus                     External
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.22bis

                             USR HST
Error Correction/Compression MNP5

[Image]

                                CONNECTIONS

         Purpose             Location          Purpose           Location

  Line in                      CN1       DC power                  CN4

  Line out                     CN2       Power switch              SW2

  RS-232/422                   CN3

              DTR SIGNAL

  Setting                SW1/1

   On              DTR forced high

  Off                  DTR normal

                          RESULT CODES

  Setting                                    SW1/2

   Off                           Verbal result codes enabled

  On                             Numeric result codes enabled

          RESULT CODES DISPLAY

  Setting                  SW1/3

   On               Display disabled

  Off                 Display enabled

            ECHO COMMANDS DISPLAY

  Setting                      SW1/4

   Off                  Local echo enabled

  On                    Local echo disabled

                                AUTO ANSWER

  Setting                                            SW1/5

   On                                Modem does not answer on first ring

  Off                                     Modem answers on first ring

           CARRIER DETECT

  Setting               SW1/6

   Off               CD normal

  On               CD forced high

               MULTILINE PHONE INSTALLATION

  Setting                               SW1/7

   Off                         Single phone connected

  On                          Multiple phones connected

                      AT COMMAND SET

  Setting                               SW1/8

   On                        AT command set recognized

  Off                          AT command set disabled

                                ESCAPE CODE

  Setting                                           SW1/9

   On                                 Go to command mode and display OK
                                     result code when escape character is
                                                   received

  Off                                 Disconnect, go to command mode and
                                        display NO CARRIER when escape
                                            character is received

                 USER PROFILE

  Setting                      SW1/10

   Off                  Use stored profile

  On                    Use factory default

                       TX/RX PIN ASSIGNMENT

  Setting                                      SW3

   Off                                  Normal operation

  On                              Reverse TX/RX pin assignments

                             DIAGNOSTIC LED(S)

    LED        Color         Status                  Condition

    HS          Red            On          Modem is operating at 9600bps

    HS          Red            Off          Modem is operating at slower
                                                   than 9600bps

    AA          Red            On               Auto-answer enabled

    AA          Red            Off             Auto-answer disabled

    CD          Red            On             Carrier signal detected

    CD          Red            Off          Carrier signal not detected

    OH          Red            On                Modem is off-hook

    OH          Red            Off               Modem is on-hook

    RD          Red         Blinking          Modem is receiving data

    RD          Red            Off          Modem is not receiving data

    TD          Red         Blinking        Modem is transmitting data

    TD          Red            Off        Modem is not transmitting data

    TR          Red            On               DTR signal is high

    TR          Red            Off               DTR signal is low

    MR          Red            On                   Power is on

    MR          Red            Off                 Power is off

    MR          Red         Blinking       Modem is retraining or in test
                                                       mode.

    RS          Red            On               RTS signal is high

    RS          Red            Off               RTS signal is low

    CS          Red            On               CTS signal is high

    CS          Red            Off               CTS signal is low

    EC          Red            On            Error correction enabled

    EC          Red            Off           Error correction disabled

    EC          Red         Blinking       Modem is retransmitting data

    AL          Red            On          Analog loopback self test mode
                                                     enabled.

    AL          Red            Off               Normal operation

                         Proprietary AT Command Set

                          BIT-MAPPED REGISTER S13

  Format                AT [cmds] S13=n [cmds]

  Example:              ATS13=139<CR>

  Default:              0

  Range:                0 - 255

  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        Normal auto answer operation.

                1          When ring is received, enter originate and
                           listen for answer tone.

      2          0        Pause 250ms before displaying result codes.

                1          Immediate result code display.

      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        Hardware reset disabled.

                1          Hardware reset enabled.

                          BIT-MAPPED REGISTER S15

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

  Example:                  ATS15=139<CR>

  Default:                  0

  Range:                    0 - 255

  Unit:                     Bit-mapped

  Description:              Controls HST high frequency equalization,
                            online fallback, back channel,
                            non-error-correcting mode buffer, MNP4,
                            BS/DEL switch, and MNP compliance.

       Bit          Value                       Function

        0            0        HST high frequency equalization enabled.

                    1          HST high frequency equalization disabled.

        1            0        Online fallback enabled.

                    1          Online fallback disabled.

        2            0        450bps back channel enabled.

                    1          450bps back channel disabled.

        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.

        6            0        MNP normal.

                    1          MNP adjusted for non compliant modems.

        7            0        Proprietary network compatibility
                               disabled.
                    1
                               Proprietary network compatibility enabled.

                               BREAK LENGTH

  Type:          Register

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

  Example:       ATS21=20<CR>

  Default:       10

  Range:         Unidentified

  Unit:          10 ms

  Description:   Sets the length of Error correction mode breaks sent
                 from DCE to DTE.

                                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.

  &Y3            Break does not empty buffer and is sent with transmitted
                 data.

                       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

                            DISCONNECT DISPLAY

  Type:          Immediate

  Format:        AT [cmds] S17? [cmds]

  Example:       ATS17?<CR>

  Default:       Read only

  Range:         1-6, 254, 255

  Description:   Displays the reason for a disconnect during error
                 correcting mode.

     Value                               Meaning

     S17=1       Received data different than requested.

     S17=2       Incompatible MNP protocol.

     S17=3       Connection request parameters unknown.

     S17=4       Remote modem retry timeout.

     S17=5       Inactivity timeout.

     S17=6       Destination user not found.

    S17=254      Peer protocol error.

    S17=255      User initiated disconnect.

                           ERROR CORRECTION MODE

  Type:          Configuration

  Format:        AT [cmds] &Mn [cmds]

  Example:       AT &M1 %C1<CR>

  Description:   Selects active error correction protocols.

  Command                                Function

  &M0            Normal mode only.

   &M4          Auto-detect mode.

  &M5            ARQ mode only.

                           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.

                       FLOW CONTROL CHARACTER - XOFF

  Type:          Register

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

  Example:       ATS23=20<CR>

  Default:       19

  Range:         11-127

  Unit:          ASCII

  Description:   Sets the character used to represent XOFF.

                       FLOW CONTROL CHARACTER - XON

  Type:          Register

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

  Example:       ATS22=20<CR>

  Default:       17

  Range:         11-127

  Unit:          ASCII

  Description:   Sets the character used to represent XON.

                         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.

  &I3            Hewlett-Packard host mode.

  &I4            Hewlett-Packard Terminal mode.

  &I5            XON/XOFF passthrough for non error correction mode
                 enabled.

                             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.

                                   PAUSE

  Type:          Configuration

  Format:        AT [cmds] / [cmds]

  Example:       AT /// &W<CR>

  Description:   125ms pause for each /.

                               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 ATx help screen.

         &$            Shows AT& help screen.

         D$            Shows ATDx help screen.

         S$            Shows S-register 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.

                            NO CARRIER DISPLAY

  Type:          Immediate

  Format:        AT [cmds] S20? [cmds]

  Example:       ATS20?<CR>

  Default:       Read only

  Range:         0-7

  Description:   Displays the reason for a NO CARRIER result code..

     Value                               Meaning

     S20=0       Key press abort.

     S20=1       DTR low.

     S20=2       Escape code sent.

     S20=3       Connection broken.

     S20=4       Inactivity timeout.

     S20=5       Automatic hangup with error correction incompatibility .

     S20=6       Error correction retry timeout.

     S20=7       Error correction received disconnect.

                         REGISTER S18

  Note: This register is reserved and should not be changed.

                           REPEAT COMMAND STRING

  Type:          Configuration

  Format:        AT [cmds] > [cmds]

  Example:       AT *D1 > #E1<CR>

  Description:   Causes modem to repeat command string until a keyboard
                 key is pressed.

                            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 call duration.

       I4        Reports current command settings.

       I5        Reports current NVRAM settings.

       I6        Reports current connections statistics.

       I7        Reports configuration.

                                TEST MODES

  Type:          Register

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

  Example:       ATS16=0<CR>

  Description:   Controls analog loopback pattern and dial tests

  Command                                Function

   S16=0        Testing disabled.

  S16=1          Analog loopback test enabled.

  S16=2          Dial test enabled.

  S16=4          Test pattern enabled.

  S16=5          Analog loopback with test pattern enabled.

                               TIME DISPLAY

  Type:          Immediate

  Format:        AT [cmds] Kn [cmds]

  Example:       AT K1 *L2 #E1<CR>

  Description:   Displays the current call time or clock time.

  Command                                Function

   K0           Display length of last call.

  K1             Display actual time.

