
3COM CORPORATION

US ROBOTICS COURIER EXTERNAL I-MODEM

Card Type                    Modem (synchronous/asynchronous)
Chip Set                     Unidentified
Maximum Modem Rate           56Kbps

ISDN Transfer Rate           128Kbps
Maximum Fax Rate             14.4Kbps
Data Modulation Protocol     Bell 103/212A

ISDN Protocol                ITU-T x2, V.34, V.FC, V.32terbo, V.32,
                             V.32bis

                             ITU-T V.120, V.110
Fax Modulation Protocol      Unidentified
Error Correction/Compression MNP5, V.42, V.42bis
Fax Class                    Class I & II
Data Bus                     External

[Image]

                                CONNECTIONS

         Function            Label            Function             Label

  DC power                        CN1       Line out                CN4

  ISDN connector                  CN2       Line in                 CN5

  RS-232/422                      CN3









                        USER CONFIGURABLE SETTINGS

                    Function                      Label      Position

  Load &F0 setting upon reset                     SW1/1         Off

  Load NVRAM settings upon reset                  SW1/1         On

  Factory configured - do not alter               SW1/3    Unidentified

  Factory configured - do not alter               SW1/4    Unidentified

                    TERMINATION

  Setting     SW1/9    SW1/10    SW1/11    SW1/12

   0 Ohm       Off       Off      Off       Off

   50 Ohm      Off       On       Off        On

  100 Ohm      On        Off       On       Off

                              V.35 SELECTION

   Setting      SW1/3     SW1/4     SW1/5     SW1/6     SW1/7     SW1/8

     V.35        On        Off       Off       Off       Off       Off
   enabled



































































                      DIAGNOSTIC LED(S)

            Note: The function of the LEDs is unidentified.



                       SUPPORTED COMMAND SET

                         Basic AT Commands

  AT, +++, A/

  A, B, C, E, F, O, V

  &C, &G, &Z

                            S Registers

  S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S26

  Note: See MHI Help File for full command documentation.

                         Proprietary AT Command Set

                          ADDITIONAL RESULT CODES

  Type:                  Configuration

  Format:                AT [cmds] &An [cmds]

  Description:           Controls the display of the additional result
                         codes

        Command                              Function

          &A0            Do not display ARQ result codes

          &A1            Display ARQ result codes

          &A2            Display ARQ result codes, HST, V.32, V.FC, V.34
                         or Digital modulation indicator

          &A3            Display ARQ result codes and error control
                         indicator LAPM, HST, MNP, SYNC, V.120, or NONE

                              BREAK HANDLING

  Type:          Configuration

  Format:        AT [cmds] &Yn [cmds]

  Description:   Controls the break handling

    Command                              Function

      &Y0        Destructive, dont send break

      &Y1        Destructive, expedited break sent

      &Y2        Nondestructive, expedited break sent

      &Y3        Non destructive un-expedited break sent

















                              CONNECTION RATE

  Type:          Configuration

  Format:        AT [cmds] &Nn [cmds]

  Description:   Controls the connection rate

    Command                              Function

      &N0        Variable rate

      &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

      &N15       31.2Kbps

      &N16       33.6Kbps

                             DATA COMPRESSION

  Type:          Configuration

  Format:        AT [cmds] &Kn [cmds]

  Description:   Controls the data compression

    Command                              Function

      &K0        Data compression disabled

      &K1        Use auto enable/disable data compression

      &K2        Data compression always enabled

      &K3        Selective data compression

                           DATA SET READY (DSR)

  Type:           Configuration

  Format:         AT [cmds] &Sn [cmds]

  Description:    Selects DSR options

     Command                             Function

       &S0        DSR forced high

       &S1        DSR high only while modem is handshaking or connected

       &S2        Pulsed DSR sent with CTS following CD when the carrier
                  is lost

       &S3        Pulsed DSR sent following CD when the carrier is lost

       &S4        Send the computer a DSR signal at the same time as the
                  CD

       &S5        Send DSR normally, and follow CTS with CD







                         DATA TERMINAL READY (DTR)

  Type:                  Configuration

  Format:                AT [cmds] &Dn [cmds]

  Description:           Selects modem response to DTR

            Note: The action each variant of &D causes depends on the
            setting of &Q

        Command                              Function

          &D0            Modem does not respond to DTR

          &D1            Modem goes to command mode after DTR goes is off

          &D2            Modem goes to command mode and disconnects
                         (hangs up) after DTR goes off; Auto-Answer is
                         disabled.

                                   DIAL

  Type:                  Immediate

  Format:                AT [cmds] D<#> [cmds]

  Description:           Dials telephone number according to any
                         modifiers included in the string

  Note:                  Any combination of modifiers can be used to
                         produce the desired dial functions in sequence.

        Command                              Function

          DL             Re-dial last number

          DP             Pulse dialing enabled

          DR             Answer mode enabled; originate mode disabled
                         following handshake initiation.

         DS=n            Dial stored telephone number n

          DT             Tone dialing enabled/Pulse dialing disabled

          DW             Dialing resumed following dial tone detection

          D,             Dialing paused for amount of time specified in
                         S8 register

        D"WXY"           Optional method of denoting telephone numbers.
                         Letters enclosed in quotes are interpreted as
                         numbers according to the system found on a
                         telephone keypad.

          D@             Wait for Quite Answer function enabled. Modem
                         waits until a "quiet answer," a ring-back signal
                         followed by silence up to the time specified in
                         S7, is received prior to executing the rest of
                         the dial string.

          D$             Wait for prompt tone detection function enabled.
                         Waits for prompt tone for amount of time
                         specified by the S7 command.

          D;             Modem returned to idle state after dialing. The
                         semicolon can only be placed at the end of the
                         dial command.

          D/             Pause for 125 milliseconds



























                               ERROR CONTROL

  Type:          Configuration

  Format:        AT [cmds] &Mn [cmds]

  Description:   Selects the error control protocol

    Command                                Mode

      &M0        Normal mode, no error control

      &M1        On-line synchronous mode, no error control

      &M4        Normal/ARQ mode,

      &M5        ARQ asynchronous mode

      &M6        V.25bis synchronous mode.

      &M7        V.25bis synchronous mode using HDLC link protocol

                          FACTORY DEFAULT PROFILE

  Type:             Configuration

  Format:           AT [cmds] &F [cmds]

  Description:      Sets values in active profile to values found in the
                    default profile

     Command                              Function

       &F0          Load No Flow Control template settings

       &F1          Load Hardware Flow Control template settings

       &F2          Load Software Flow Control template settings

                              HARDWARE RESET

  Type:          Immediate

  Format:        AT [cmds] Z! [cmds]

  Description:   Performs a hardware reset

                                   HELP

  Type:           Configuration

  Format:         AT [cmds] $ [cmds]

  Description:    Display the help commands for the selected command sets

    Command                              Function

       #$         Display the help pannels for the octothorpe (#) command
                  set

       *$         Displays the help pannels for the * command set

                               HOOK CONTROL

  Type:          Immediate

  Format:        AT [cmds] Hn [cmds]

  Description:   Selects whether the modem is on-hook or off-hook

    Command                              Function

       H0        Modem commanded to go on-hook (hang-up)

                              LINE SELECTION

  Type:          Configuration

  Format:        AT [cmds] &Ln [cmds]

  Description:   Selects the phone line type

    Command                              Function

      &L0        Switched line (PSTN/Dial-up)

                                MODEM CLOCK

  Type:                  Configuration

  Format:                AT [cmds] Kn [cmds]

  Description:           Controls the modem clock

        Command                              Function

          K0             If on-line, display current call duration; if
                         off-line, display the last calls duration

          K1             Display the actual time (set clock using
                         ATI3=HH:MM:SS K1)

                         RECEIVE DATA FLOW CONTROL

  Type:                  Configuration

  Format:                AT [cmds] &In [cmds]

  Description:           Controls the receive data flow control

        Command                             Jack Type

          &I0            Disables XON/XOFF flow control

          &I1            Modem acts on typed XON/XOFF commands, Ctrl -S,
                         or Ctrl -Q and passes them to remote device

          &I2            Modem acts on typed XON/XOFF commands but
                         removes them from data stream

          &I3            Hewlett Packard host mode

          &I4            Hewlett Packard terminal mode

          &I5            Enable flow control on the phone link when the
                         connection is not under error control

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Description:   Displays information requested

    Command                              Function

       I0        Reports 4 digit product code

       I1        Reports results of ROM checksum

       I2        Reports results of RAM test

       I3        Reports the product name

       I4        Reports the current modem settings

       I5        Reports the settings stored in NVRAM

       I6        Reports statistics for the last call

       I7        Reports product configuration

      I10        Reports dial security account status information

      I11        Displays high speed connection report

      I12        Display the ISDN settings

                               RESULT CODES

  Type:          Configuration

  Format:        AT [cmds] Qn [cmds]

  Description:   Enables modem to send result codes to the DTE

    Command                              Function

       Q0        Result code sending enabled

       Q1        Result code sending disabled

       Q2        Suppress result codes when answering

                                  RTS/CTS

  Type:           Configuration

  Format:         AT [cmds] &Rn [cmds]

  Description:    Selects RTS/CTS options

    Command                              Function

      &R0         CTS follows RTS in data mode; RTS is ignored in command
                  mode.

      &R1         CTS forced high, RTS is ignored.

      &R2         Enable hardware flow control of received data

                     SELECT CALL PROGRESS RESULT CODES

  Type:                  Configuration

  Format:                AT [cmds] Xn [cmds]

  Description:           Enables selection of tone detection and
                         associated result code format options

        Command                              Function

           X0            Busy and dial tone detection disabled; result
                         codes 0 - 4 enabled.

           X1            Busy and dial tone detection disabled; result
                         codes 0 - 5 & 10 enabled.

           X2            Busy tone detection disabled, dial tone
                         detection enabled; result codes 0 - 6 & 10
                         enabled.

           X3            Busy tone detection enabled, dial tone detection
                         disabled; result codes 0 - 5, 7 & 10 enabled.

           X4            Busy and dial tone detection enabled; result
                         codes 0 - 7 & 10 enabled.

           X5            Busy tone detection enabled, dial tone detection
                         disabled, all result codes enabled

           X6            All result codes enabled

           X7            Voice detection disabled, all result codes
                         enabled

                             SERIAL PORT RATE

  Type:                Configuration

  Format:              AT [cmds] &Bn [cmds]

  Description:         Controls the serial port rate

       Command                              Function

         &B0           Variable serial port rate

         &B1           Fixed serial port rate

         &B2           In answer mode use fixed rate for ARQ calls and
                       variable rate for non ARQ calls.

                                TEST MODES

  Type:          Immediate

  Format:        AT [cmds] &Tn

  Description:   Selects test options

    Command                              Function

      &T0        End current test

      &T3        Begin local digital loopback

      &T4        Grant remote digital loopback request

      &T5        Deny remote digital loopback request

      &T6        Request remote digital loopback

      &T7        Request remote digital loopback and self-test





                        TRANSMIT DATA FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] &Hn [cmds]

  Description:   Controls the transmit data flow

    Command                              Function

      &H0        Flow control disabled

      &H1        Hardware flow control enabled

      &H2        Software flow control enabled

      &H3        Both hardware and software flow control enabled

                          WRITE CURRENT SETTINGS

  Type:          Immediate

  Format:        AT [cmds] &W [cmds]

  Description:   Writes the current settings to NVRAM

                            Extended AT Commands

                              ASSIGN PASSWORD

  Type:          Immediate

  Format:        AT [cmds] %V=PWn [cmds]

  Description:   Assign the password in account n in security account

                                 CALL TYPE

  Type:           Configuration

  Format:         AT [cmds] *Vn [cmds]

  Description:    Sets the call type

  Bit     Unit                           Function

  *V1       0     3.1 kHz audio (modem/fax)

           1      Speech

  *V2       0     Autodetect

            1     V.120 rate adaption only

            2     V.110 rate adaption only

            3     Modem or fax only

            4     Clear-channel synchronous

           5      Asynchronous to synchronous PPP conversion

                          CENTRAL OFFICE PROTOCOL

  Type:            Configuration

  Format:          AT [cmds] *Wn [cmds]

  Description:     Sets the protocol used by the telephone companys
                   central office

     Command                              Function

       *W0         AT&T 5ESS custom

       *W1         Northern Telecom DMS-100

       *W2         National ISDN-1

       *W3         National ISDN-2

                                CLOCK SPEED

  Type:          Configuration

  Format:        AT [cmds] %Nn [cmds]

  Description:   Sets clock speed for synchronous mode

    Command                              Function

      %N2        1200bps

      %N3        2400bps

      %N4        4800bps

      %N5        7200bps

      %N6        9600bps

      %N7        12000bps

      %N8        14400bps

      %N9        16800bps

      %N10       19200bps

                               DIALING MODE

  Type:          Immediate

  Format:        AT [cmds] *On [cmds]

  Description:   Sets the dialing mode

    Command                              Function

      *O0        En-bloc dialing

      *O1        Overlap dialing

                             DIRECTORY NUMBER

  Type:          Configuration

  Format:        AT [cmds] *P [cmds]

  Description:   Sets the Directory number assigned by the phone company

    Command                              Function

      *P1        The DN for Voice B-channel

      *P2        The DN for Data B-channel

                          ERASE SECURITY SETTINGS

  Type:            Configuration

  Format:          AT [cmds] %En [cmds]

  Description:     Erases selected security settings

     Command                             Function

       %E1         Erase local access password

       %E2         Erase autopass password

       %E3         Erase passwords in accounts 0-9

       %E4         Erase phone numbers in accounts 0-9

       %E5         Disable account, dialback, and new number fields in
                   accouns 0-9

                           LOCAL ACCESS PASSWORD

  Type:          Configuration

  Format:        AT [cmds] %Ln [cmds]

  Description:   Set local access password



                             PASSWORD SECURITY

  Type:          Immediate

  Format:        AT [cmds] %P [cmds]

  Description:   Disable password security

                           REMOTE CONFIGURATION

  Type:             Configuration

  Format:           AT [cmds] %Cn [cmds]

  Description:      Controls the remote configuration

     Command                              Function

       %C0          Defer configuration changes until the call is ended

       %C1          Cancel configuration changes and restore the original
                    configuration

       %C2          Force configuration changes to take effect
                    immediately

                           REMOTE CONFIGURATION

  Type:          Configuration

  Format:        AT [cmds] %Fn [cmds]

  Description:   Configure another devices data remotely

    Command                              Function

      %F0        No parity, 8 data bits

      %F1        Mark parity, 7 data bits

      %F2        Odd parity, 7 data bits

      %F3        Even parity, 7 data bits

                           RINGING SIGNAL VOLUME

  Type:          Configuration

  Default:       Unidentified

  Range:         0-9

  Format:        AT [cmds] *Rn [cmds]

  Description:   Sets the ringing signal volume

                             SECURITY ACCOUNTS

  Type:          Configuration

  Format:        AT [cmds] %An [cmds]

  Description:   Create and configure security accounts

                             SECURITY ACCOUNTS

  Type:          Configuration

  Format:        AT [cmds] %Sn [cmds]

  Description:   Access security accounts















                             SERIAL PORT RATE

  Type:          Configuration

  Format:        AT [cmds] %Bn [cmds]

  Description:   Remotely configure a modems serial port rate

    Command                              Function

      %B0        110bps

      %B1        300bps

      %B2        600bps

      %B3        1200bps

      %B4        2400bps

      %B5        4800bps

      %B6        9600bps

      %B7        19200bps

      %B8        38400bps

      %B9        57600bps

      %B10       115200bps

                            SERVICE PROFILE ID

  Type:          Configuration

  Format:        AT [cmds] Sn=? [cmds]

  Description:   Sets the service profile ID

    Command                              Function

      *S1        The SPID for the Voice B-channel

      *S2        The SPID for the Data B-channel

                        TELEPHONE COMPANY PROTOCOL

  Type:          Configuration

  Format:        AT [cmds] *Mn [cmds]

  Description:   Set switch protocol

    Command                              Function

      *M0        Point-to-point

      *M1        Multipoint

                           TERMINAL ENDPOINT ID

  Type:          Configuration

  Format:        AT [cmds] *T [cmds]

  Description:   Sets the Terminal endpoint ID

    Command                              Function

      *T1        0-63 for the Voice B-channel

      *T2        0-63 for the Data B-channel

                             TONE FREQUENCIES

  Type:          Configuration

  Format:        AT [cmds] %Tn [cmds]

  Description:   Enables recognition of the tone frequencies





                                  VOLUME

  Type:             Configuration

  Format:           AT [cmds] *Cn [cmds]

  Description:      Sets the volume of the sound that comes out of the
                    analog device jack

     Command                              Function

       *C0          Off

       *C1          Volume level 1

       *C2          Volume level 2

       *C3          Volume level 3

       *C4          Volume level 4

       *C5          Volume level 5

       *C6          Volume level 6

       *C7          Volume level 7

       *C8          Volume level 8

       *C9          Volume level 9

                            S(status) -REGISTERS

                            BIT MAPPED REGISTER

  Type:                  Register

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

  Unit:                  Bit-mapped

  Description:           Controls fallback

    Bit       Value                          Function

     0              1    Disable the modems extra high frequency
                         equalization if it causes problems on shorter
                         -link calls- for HST modulation only

     1              2    Disable online fallback

     2              4    Disable 450bps back channel ---HST only

     3              8    Reset non-ARQ mode transmit buffer from
                         1.5Kbytes to 128

     4             16    Disable MNP level 4

     5             32    Set backspace key to delete

     6             64    Set for some incompatable 2400bps MNP-I modems

     7            128    Custom applications only

                          BIT MAPPED REGISTER S16

  Type:            Register

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

  Unit:            Bit-mapped

  Description:     Controls loopback tests and test pattern

   Bit    Value                           Function

    2         4    Test pattern

    3         8    Remote digital loopback











                          BIT MAPPED REGISTER S53

  Type:                 Register

  Format:           AT [cmds] S53=n [cmds]

  Default:          126

  Description:      Bit mapped register

     Bit       Value                        Function

      0            1    Dial security enabled

      1            2    Prompting enabled

      2            4    Local access password protection enabled

                          BIT MAPPED REGISTER S54

  Type:                 Register

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

  Unit:            Bit mapped

     Bit       Value                        Function

      0             1   Disable 2400 symbol rate

      1             2   Disable 2743 symbol rate

      2             4   Disable 2800 symbol rate

      3             8   Disable 3000 symbol rate

      4            16   Disable 3200 symbol rate

      5            32   Disable 3429 symbol rate

      6            64   Disable Call Indicate

      7           128   Disable V.8

                          BIT-MAPPED REGISTER S13

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

  Default:            170

  Range:              0-174

  Unit:               Bit-mapped

  Description:        Controls echo, result codes and display, dial mode,
                      and answer/originate mode.

   Bit       Value                         Function

    0             1   Reset when DTR drops

    1             2   Reverse normal auto answer mode

    2             4   Disable 250 msec pause before result code display

    3             8   On DTR signal, Autodial the number stored in NVRAM
                      at position 0

    4            16   At power on/reset, auto dial number stored in NVRAM
                      at position 0

    5            32   Disable HST

    6            64   Disable MNP level 3

    7           128   Hardware reset

















                          BIT-MAPPED REGISTER S14

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

  Default:            170

  Range:              0-174

  Unit:               Bit-mapped

  Description:        Controls echo, result codes and display, dial mode,
                      and answer/originate mode.

   Bit       Value                         Function

    0             1   Disconnect on escape code

    1             2   Send result codes only when originating a call

                          BIT-MAPPED REGISTER S21

  Format              AT [cmds] S21=n [cmds]

  Default:            Unidentified

  Range:              Unidentified

  Unit:               .01 second

  Description:        Sets the duration of breaks sent from the modem to
                      the computer or terminal

                          BIT-MAPPED REGISTER S28

  Format               AT [cmds] S28=n [cmds]

  Default:             Unidentified

  Range:               8

  Unit:                .1 second

  Description:         Sets the duration of the extra 3000/600 Hz answer
                       tones sent during handshaking.

                          BITMAPPED REGISTER S27

  Format           AT [cmds] S27=n [cmds]

  Default:         Unidentified

  Range:           0

  Unit:            Bit-mapped

  Description:     Selects modulation

   Bit    Value                           Function

    0         1    Enable ITU-T V.21

    1         2    Enable un-encoded modulation in V.32 mode

    2         4    Disable V.32 modulation

    3         8    Disable 2100Hz answer tone

    4          0   V.42 detection, LAPM error control, MNP

              16   Disable MNP

               0   Disable V.42 detection and LAPM

             16    Disable detection phase

    5          0   V.42 detection, LAPM error control, MNP

              32   Disable MNP

               0   Disable V.42 detection and LAPM

             32    Disable detection phase

    7       128    Unusual software incompatibility





                          BIT-MAPPED REGISTER S34

  Type:                Register

  Format:              AT [cmds] S34n [cmds]

  Default:             0

  Range:               Unidentified

  Unit:                Unidentified

  Description:         Controls V.32bis

    Bit      Value                          Function

     0            1    Disable V.32bis

     1            2    Disable modems enhanced proprietary V.32bis
                       modulation

     2            4    Disable the faster retrains that occure during
                       proprietary V.32terbo modulation

     3            8    Enable V.23

     4           16    Force the MR LED to show DSR

     5           32    Enable MI/MIC

     6           64    Disable remote access busy message

     7          128    Disable V.32terbo

                          BIT-MAPPED REGISTER S51

  Format           AT [cmds] S51=n [cmds]

  Default:         0

  Range:           Unidentified

  Unit:            Bit-mapped

  Description:     MNP/V.42 control

   Bit    Value                           Function

    0         1    Disable MNP/V.42 for V.22

    1         2    Disable MNP/V.42 for V.22bis

    2         4    Disable MNP/V.42 for V.32/V.32bis/V.32terbo

    6        64    Disable selective reject

    7       128    Enable handset exclusion delay

                          BIT-MAPPED REGISTER S55

  Type:            Register

  Format           AT [cmds] S55=n [cmds]

  Unit:            Bit mapped

   Bit    Value                           Function

    0         1    Disable 8S-2D mapping

    1         2    Disable 16S-4D mapping

    2         4    Disable 32S-2D mapping

    3         8    Disable 64S-4D mapping

















                          BIT-MAPPED REGISTER S56

  Type:            Register

  Format           AT [cmds] S56? [cmds]

  Unit:            Bit mapped

   Bit    Value                           Function

    0         1    Disable non-linear coding

    1         2    Disable TX level deviation

    2         4    Disable pre-emphasis

    3         8    Disable precoding

    4        16    Disable shaping

    6        64    Disable V.34

    7       128    Disable V.FC

                          BIT-MAPPED REGISTER S67

  Type:            Register

  Format           AT [cmds] S67 [cmds]

  Unit:            Bit mapped

   Bit    Value                           Function

    0         1    Disable non-linear coding

    1         2    Disable TX level diviation

    2         4    Disable preemphasis

    3         8    Disable precoding

    4        16    Disable shaping

    6        64    Disable V.34

    7       128    Disable V.FC

                          BIT-MAPPED REGISTER S68

  Type:            Register

  Format           AT [cmds] S68 [cmds]

  Unit:            Bit mapped

   Bit    Value                           Function

    0         1    Enable V.110 fallback

    1         2    Use fixed network rate

    2         4    Fix the network rate at 64Kbps

    3         8    Route incoming analog calls to the data port

    4        16    Enable a 45-65 second link delay

    5        32    Map B1 LED = B-channel 1 and B2 LED to B-channel 2

    6        64    Disable all blinking patterns for B-channel LEDs

                          BIT-MAPPED REGISTER S69

  Type:            Register

  Format           AT [cmds] S69 [cmds]

  Unit:            Bit mapped

   Bit    Value                           Function

    0         1    Disable Plug and Play signaling





                              DSR RECOGNITION

  Type:          Register

  Format         AT [cmds] S25=n [cmds]

  Default:       5

  Range:         Unidentified

  Unit:          .1 second

  Description:   Sets DTR recognition time

                                DSR SIGNAL

  Type:                Register

  Format               AT [cmds] S24=n [cmds]

  Default:             150

  Range:               Unidentified

  Unit:                .02 second

  Description:         Sets the duration between pulsed DSR signals when
                       the modem is set to &S2 or &S3.

                       FLOW CONTROL CHARACTER - XOFF

  Format         AT [cmds] S23=n [cmds]

  Default:       19

  Range:         Unidentified

  Unit:          ASCII

  Description:   Sets the character used to represent XOFF

                       FLOW CONTROL CHARACTER - XON

  Format         AT [cmds] S22=n [cmds]

  Default:       17

  Range:         Unidentified

  Unit:          ASCII

  Description:   Sets the character used to represent XON



                            GUARD TIME DURATION

  Type:            Register

  Format           AT [cmds] S43=n [cmds]

  Default:         200

  Unit:            .02 second

  Description:     Sets the duration of the guard time for the remote
                   access sequence

                             INACTIVITY TIMER

  Type:          Register

  Format         AT [cmds] S19=n [cmds]

  Default:       Unidentified

  Range:         Unidentified

  Unit:          Minute

  Description:   Sets the duration in minutes for the inactivity timer



                               REMOTE ACCESS

  Type:                   Register

  Format                  AT [cmds] S41=n [cmds]

  Default:                0

  Description:            Sets the number of allowable remote access
                          login attempts, thus enabling or disabling
                          remote access.

                      REMOTE ACCESS ESCAPE CHARACTER

  Type:             Register

  Format            AT [cmds] S42=n [cmds]

  Default:          126

  Range:            Unidentified

  Unit:             Unitdentified

  Description:      Stores the ASCII decimal code for the remote access
                    escape character.

                              TRANSMIT BUFFER

  Type:                   Register

  Format                  AT [cmds] S38n [cmds]

  Default:                0

  Description:            Sets the time before a forced hang up and
                          clearing of the transmit buffer when DTR drops
                          during an ARQ call.

