3COM CORPORATION
================

   COURIER V.32/PC

   Card Type                    Modem (asynchronous)              
   Chip Set                     U.S. Robotics                     
   Maximum Data Rate            14.4Kbps                          
   Data Bus                     Unidentified                      
   Data Modulation Protocol     Unidentified                      
   Error Correction/Compression Unidentified                      

                                                            54154

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Setting                 | Label  | Position |
   |----------------------------------------+--------+----------|
   | i DTR normal                           | SW1/1  |   Off    |
   |----------------------------------------+--------+----------|
   | DTR forced high                        | SW1/1  |    On    |
   |----------------------------------------+--------+----------|
   | i Verbal result codes                  | SW1/2  |   Off    |
   |----------------------------------------+--------+----------|
   | Numeric result codes                   | SW1/2  |    On    |
   |----------------------------------------+--------+----------|
   | i Enable result codes displayed        | SW1/3  |    On    |
   |----------------------------------------+--------+----------|
   | Disable result codes displayed         | SW1/3  |   Off    |
   |----------------------------------------+--------+----------|
   | i Local echo enabled                   | SW1/4  |   Off    |
   |----------------------------------------+--------+----------|
   | Local echo disabled                    | SW1/4  |    On    |
   |----------------------------------------+--------+----------|
   | i Auto answer disabled                 | SW1/5  |    On    |
   |----------------------------------------+--------+----------|
   | Auto answer enabled                    | SW1/5  |   Off    |
   |----------------------------------------+--------+----------|
   | i CD signal normal                     | SW1/6  |   Off    |
   |----------------------------------------+--------+----------|
   | CD signal forced high                  | SW1/6  |    On    |
   |----------------------------------------+--------+----------|
   | i Display result codes in originate    | SW1/7  |   Off    |
   | and answer mode                        |        |          |
   |----------------------------------------+--------+----------|
   | Display result codes in originate mode | SW1/7  |    On    |
   | only                                   |        |          |
   |----------------------------------------+--------+----------|
   | i Smart mode enabled                   | SW1/8  |    On    |
   |----------------------------------------+--------+----------|
   | Dumb mode enabled                      | SW1/8  |   Off    |
   |----------------------------------------+--------+----------|
   | i Normal operation enabled             | SW1/9  |    On    |
   |----------------------------------------+--------+----------|
   | Escape sequence enabled                | SW1/9  |   Off    |
   |----------------------------------------+--------+----------|
   | i Restore NVRAM defaults               | SW1/10 |   Off    |
   |----------------------------------------+--------+----------|
   | Restore factory defaults               | SW1/10 |    On    |
   +------------------------------------------------------------+

                     Proprietary AT Command Set

   +------------------------------------------------------------+
   |                           ABORT                            |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | Any key                                     |
   |--------------+---------------------------------------------|
   | Description: | Aborts answering/originating a call; modem  |
   |              | hangs up.                                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                           ANSWER                           |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] A                                 |
   |--------------+---------------------------------------------|
   | Description: | Enables manual answer mode, the modem goes  |
   |              | off-hook; pressing any key will abort.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      ANSWER SEQUENCE                       |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Bn [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Selects the answer sequence the modem will  |
   |              | use                                         |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |     i B0     | V.32 mode/ITU-T answer sequence enabled     |
   |--------------+---------------------------------------------|
   |      B1      | HST mode/Bell answer tone enabled           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         ATTENTION                          |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds]                                   |
   |--------------+---------------------------------------------|
   | Description: | Tells the modem that a command follows or   |
   |              | use alone to test OK result code            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S13                   |
   |------------------------------------------------------------|
   | Format       | AT [cmds] S13=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 0                                           |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Controls DTR reset, DTR dialing, reset      |
   |              | dialing, HST modulation, and MNP3.          |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   |  0   |   i 0 | DTR normal                                  |
   |      |       |                                             |
   |      |     1 | Reset on low DTR                            |
   |------+-------+---------------------------------------------|
   |  1   |   i 0 | Normal auto answer operation                |
   |      |       |                                             |
   |      |     1 | When ring is received, enter originate and  |
   |      |       | listen for answer tone                      |
   |------+-------+---------------------------------------------|
   |  2   |   i 0 | Pause 250msec. Before displaying result     |
   |      |       | codes                                       |
   |      |     1 |                                             |
   |      |       | Immediate result code display               |
   |------+-------+---------------------------------------------|
   |  3   |   i 0 | DTR dialing disabled                        |
   |      |       |                                             |
   |      |     1 | DTR dialing enabled                         |
   |------+-------+---------------------------------------------|
   |  4   |   i 0 | Reset dialing disabled                      |
   |      |       |                                             |
   |      |     1 | Reset dialing enabled                       |
   |------+-------+---------------------------------------------|
   |  5   |   i 0 | HST modulation enabled                      |
   |      |       |                                             |
   |      |     1 | HST modulation disabled                     |
   |------+-------+---------------------------------------------|
   |  6   |   i 0 | MNP 3 enabled                               |
   |      |       |                                             |
   |      |     1 | MNP 3 disabled                              |
   |------+-------+---------------------------------------------|
   |  7   |   i 0 | Hardware reset disabled                     |
   |      |       |                                             |
   |      |     1 | Hardware reset enabled                      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S15                   |
   |------------------------------------------------------------|
   | Format:      | AT [cmds] S15=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 0                                           |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Controls HST high frequency equalization,   |
   |              | online fallback, back channel,              |
   |              | non-error-correcting mode buffer, MNP4,     |
   |              | custom applications and MNP compliance.     |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   |  0   |   i 0 | HST high frequency equalization enabled     |
   |      |       |                                             |
   |      |     1 | HST high frequency equalization disabled    |
   |------+-------+---------------------------------------------|
   |  1   |   i 0 | Online fallback enabled                     |
   |      |       |                                             |
   |      |     1 | Online fallback disabled                    |
   |------+-------+---------------------------------------------|
   |  2   |   i 0 | 300bps back channel enabled                 |
   |      |       |                                             |
   |      |     1 | 300bps back channel disabled                |
   |------+-------+---------------------------------------------|
   |  3   |   i 0 | Non-error-correcting mode transmit buffer   |
   |      |       | set to 1.5KB                                |
   |      |     1 |                                             |
   |      |       | Non-error-correcting mode transmit buffer   |
   |      |       | set to 128 bytes                            |
   |------+-------+---------------------------------------------|
   |  4   |   i 0 | MNP 4 enabled                               |
   |      |       |                                             |
   |      |     1 | MNP 4 disabled                              |
   |------+-------+---------------------------------------------|
   |  5   |   i 0 | Custom applications only                    |
   |      |       |                                             |
   |      |     1 | Custom applications only                    |
   |------+-------+---------------------------------------------|
   |  6   |   i 0 | MNP normal                                  |
   |      |       |                                             |
   |      |     1 | MNP adjusted for non compliant modems       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S27                   |
   |------------------------------------------------------------|
   | Format:      | AT [cmds] S27=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 0                                           |
   |--------------+---------------------------------------------|
   | Range:       | 0-191                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Controls V.21, V.32 encoding and            |
   |              | modulation, and high speed rate shift       |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   |  0   |   i 0 | V.21 disabled                               |
   |      |       |                                             |
   |      |     1 | V.21 enabled                                |
   |------+-------+---------------------------------------------|
   |  1   |   i 0 | V.32 non-trellis coding disabled            |
   |      |       |                                             |
   |      |     1 | V.32 non-trellis coding enabled             |
   |------+-------+---------------------------------------------|
   |  2   |   i 0 | V.32 modulation enabled                     |
   |      |       |                                             |
   |      |     1 | V.32 modulation disabled                    |
   |------+-------+---------------------------------------------|
   | 3 -  | i 000 | Not used                                    |
   |  5   |       |                                             |
   |------+-------+---------------------------------------------|
   |  6   |   i 0 | 19.2Kbps enabled. High speed rate shift     |
   |      |       | needs to be enabled.                        |
   |      |     1 |                                             |
   |      |       | 38.4Kbps enabled. High speed rate shift     |
   |      |       | needs to be enabled.                        |
   |------+-------+---------------------------------------------|
   |  7   |   i 0 | High speed rate shift disabled              |
   |      |       |                                             |
   |      |     1 | High speed rate shift enabled               |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        BREAK LENGTH                        |
   |------------------------------------------------------------|
   | Type:        | Register                                    |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S21=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 10                                          |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | 10 ms                                       |
   |--------------+---------------------------------------------|
   | Description: | Sets the length of error control mode       |
   |              | breaks sent from DCE to DTE                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                           CLOCK                            |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Kn [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Displays connection duration or real time   |
   |------------------------------------------------------------|
   |    Command    |                  Function                  |
   |---------------+--------------------------------------------|
   |     i K0      | Connection duration displayed in ATI3      |
   |---------------+--------------------------------------------|
   |      K1       | Real time displayed in ATI3. To set clock  |
   |               | (military time) use ATI3=HH:MM:SSK1.       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    DATA SET READY (DSR)                    |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] &Sn [cmds]                        |
   |--------------+---------------------------------------------|
   | Description: | Selects DSR options                         |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |    i &S0     | DSR forced high                             |
   |--------------+---------------------------------------------|
   |     &S1      | DSR controlled by modem                     |
   |--------------+---------------------------------------------|
   |     &S2      | DSR toggled, CTS follows CD                 |
   |--------------+---------------------------------------------|
   |     &S3      | DSR toggled                                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            DIAL                            |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] D<#> [cmds]                       |
   |--------------+---------------------------------------------|
   | Example:     | ATDT 443-3388,,,1111;                       |
   |--------------+---------------------------------------------|
   | 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                   |
   |--------------+---------------------------------------------|
   |     i P      | Pulse dialing enabled                       |
   |--------------+---------------------------------------------|
   |      T       | Tone dialing enabled                        |
   |--------------+---------------------------------------------|
   |      ,       | Dialing paused for 2 seconds                |
   |--------------+---------------------------------------------|
   |      ;       | Modem returned to command state after       |
   |              | dialing. Can only be placed at the end of   |
   |              | the dial command.                           |
   |--------------+---------------------------------------------|
   |      "       | Dials letters as if they were numbers;      |
   |              | ATDT"GOMICRO"                               |
   |--------------+---------------------------------------------|
   |      !       | Flash function initiated                    |
   |--------------+---------------------------------------------|
   |      @       | Dial, wait for quiet answer, then continue  |
   |              | to execute the rest of the dial string      |
   |--------------+---------------------------------------------|
   |      W       | Dial, wait for second dial tone, then       |
   |              | continue to execute the rest of the dial    |
   |              | string                                      |
   |--------------+---------------------------------------------|
   |      R       | Answer mode enabled; originate mode         |
   |              | disabled following handshake initiation.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    DIAL - STORED NUMBER                    |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] DSn [cmds]                        |
   |--------------+---------------------------------------------|
   | Description: | Dial stored number from memory location n   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  DISCONNECT BUFFER DELAY                   |
   |------------------------------------------------------------|
   | Type:        | Register                                    |
   |--------------+---------------------------------------------|
   | Format       | AT [cmds] S38=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 0                                           |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | 1 second                                    |
   |--------------+---------------------------------------------|
   | Description: | Sets maximum duration allowed during        |
   |              | buffered data calls for modem to perform    |
   |              | clearing functions after losing             |
   |              | carrier-signal or receiving a clear call    |
   |              | signal from the remote modem and before     |
   |              | initiating hang-up process.                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         DSR DELAY                          |
   |------------------------------------------------------------|
   | Type:        | Register                                    |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S24=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 25                                          |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | .1 second                                   |
   |--------------+---------------------------------------------|
   | Description: | Sets the length of the DSR pulse signal     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            ECHO                            |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] En [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Controls echo function; display keyboard    |
   |              | commands when enabled.                      |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      E0      | Echo function disabled                      |
   |--------------+---------------------------------------------|
   |      E1      | Echo function enabled                       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       ECHO - ON-LINE                       |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Fn [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Selects whether data sent while in data     |
   |              | mode are echoed                             |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      F0      | Local echo enabled                          |
   |--------------+---------------------------------------------|
   |     i F1     | Local echo disabled                         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      ESCAPE SEQUENCE                       |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | +++AT [cmds] <CR>                           |
   |--------------+---------------------------------------------|
   | Description: | Initiates the escape sequence and returns   |
   |              | the modem to the on-line command state if   |
   |              | it receives three escape characters set in  |
   |              | S2 within the time allotted by S12.         |
   |------------------------------------------------------------|
   |      Note: Do not precede this command with AT.            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               FLOW CONTROL CHARACTER - XOFF                |
   |------------------------------------------------------------|
   | Type:        | Register                                    |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S23=n [cmds]                      |
   |--------------+---------------------------------------------|
   | 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]                      |
   |--------------+---------------------------------------------|
   | Default:     | 17                                          |
   |--------------+---------------------------------------------|
   | Range:       | 11-127                                      |
   |--------------+---------------------------------------------|
   | Unit:        | ASCII                                       |
   |--------------+---------------------------------------------|
   | Description: | Sets the character used to represent XON    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     FLOW CONTROL TYPE                      |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] &Hn [cmds]                        |
   |--------------+---------------------------------------------|
   | Description: | Sets type of flow control used by modem     |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |    i &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   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     FLOW CONTROL TYPE                      |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] &Rn [cmds]                        |
   |--------------+---------------------------------------------|
   | Description: | Controls receive data hardware flow control |
   |              | and RTS signals                             |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |     &R0      | Delay CTS after RTS. See S26 on length of   |
   |              | time.                                       |
   |--------------+---------------------------------------------|
   |     &R1      | Modem ignores RTS                           |
   |--------------+---------------------------------------------|
   |    i &R2     | Received data to DTE when RTS is on         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  FLOW CONTROL PASSTHROUGH                  |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] &In [cmds]                        |
   |--------------+---------------------------------------------|
   | Description: | Allows modem to act on, then transmit       |
   |              | XON/XOFF characters.                        |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |    i &I0     | Software flow control disabled              |
   |--------------+---------------------------------------------|
   |     &I1      | XON/XOFF passthrough enabled                |
   |--------------+---------------------------------------------|
   |     &I2      | XON/XOFF passthrough disabled               |
   |--------------+---------------------------------------------|
   |     &I3      | ENQ/ACK enabled in host mode                |
   |--------------+---------------------------------------------|
   |     &I4      | ENQ/ACK enabled in terminal mode            |
   |--------------+---------------------------------------------|
   |     &I5      | XON/XOFF passthrough disabled in error      |
   |              | correction mode                             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         GUARD TONE                         |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] &Gn [cmds]                        |
   |--------------+---------------------------------------------|
   | Description: | Commands the modem to transmit a guard tone |
   |------------------------------------------------------------|
   |      Note: Used primarily for international data           |
   |      transmission                                          |
   |------------------------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |    i &G0     | Guard tone disabled                         |
   |--------------+---------------------------------------------|
   |     &G1      | 550Hz guard tone enabled                    |
   |--------------+---------------------------------------------|
   |     &G2      | 1800Hz guard tone enabled                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        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)     |
   |--------------+---------------------------------------------|
   |      H1      | Modem commanded to go off-hook (pick-up)    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  LIST AMPERSAND COMMANDS                   |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] &$ [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Displays ampersand (&) commands             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     LIST DIAL COMMANDS                     |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] D$ [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Displays dial commands                      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      LIST S-REGISTERS                      |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S$ [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Displays the S-registers                    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                          ON-LINE                           |
   |------------------------------------------------------------|
   | Type:            | Immediate                               |
   |------------------+-----------------------------------------|
   | Format:          | AT [cmds] O [cmds]                      |
   |------------------+-----------------------------------------|
   | Description:     | Returns to on-line command (data        |
   |                  | transmission) mode.                     |
   |------------------------------------------------------------|
   |      Note: The O command must be placed at the end of the  |
   |      command string.                                       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        ON-LINE HELP                        |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] $ [cmds]                          |
   |--------------+---------------------------------------------|
   | Description: | On-line help; displays basic command list.  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                           PAUSE                            |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] / (slash) [cmds]                  |
   |--------------+---------------------------------------------|
   | Description: | 125 msec delay before proceeding with dial  |
   |              | string or command                           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       PULSE DIALING                        |
   |------------------------------------------------------------|
   | Type:                | Configuration                       |
   |----------------------+-------------------------------------|
   | Format:              | AT [cmds] P [cmds]                  |
   |----------------------+-------------------------------------|
   | Description:         | Enables pulse dialing               |
   |------------------------------------------------------------|
   |      Note: This command can be duplicated with the P       |
   |      modifier in the D (Dial) command.                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    PULSE DIALING RATIO                     |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] &Pn [cmds]                        |
   |--------------+---------------------------------------------|
   | Description: | Selects pulse dial make/break ratio         |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |     &P0      | 39/61ms at 10pps (North America)            |
   |--------------+---------------------------------------------|
   |     &P1      | 33/67ms at 10pps (Europe)                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        RECEIVE-ONLY                        |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Cn [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Sets receive-only; used if modem is         |
   |              | attached to additional monitoring-only      |
   |              | systems                                     |
   |------------------------------------------------------------|
   |        Command        |              Function              |
   |-----------------------+------------------------------------|
   |          C0           | Disables transmitter               |
   |-----------------------+------------------------------------|
   |         i C1          | Enables transmitter                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   REPEAT COMMAND STRING                    |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] > [cmds]                          |
   |--------------+---------------------------------------------|
   | Example:     | AT>DT5551212 or ATDT5551212>                |
   |--------------+---------------------------------------------|
   | Description: | Causes modem to repeat command string until |
   |              | a keyboard key is pressed                   |
   |------------------------------------------------------------|
   |      Note: If used before or after the ATD command, the    |
   |      modem will redial the number until a connection is    |
   |      established or a maximum of ten attempts is reached.  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  REPEAT PREVIOUS COMMAND                   |
   |------------------------------------------------------------|
   | Type:         | Immediate                                  |
   |---------------+--------------------------------------------|
   | Format:       | A/                                         |
   |---------------+--------------------------------------------|
   | Description:  | Repeats previous command; mainly used for  |
   |               | redial.                                    |
   |------------------------------------------------------------|
   |      Note: Do not precede this command with AT, or follow  |
   |      it with <CR>.                                         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       RTS/CTS DELAY                        |
   |------------------------------------------------------------|
   | Type:        | Register                                    |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S26=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 1                                           |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | .1 second                                   |
   |--------------+---------------------------------------------|
   | Description: | Sets the length of time between RTS and CTS |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     REPORT INFORMATION                     |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] In [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Displays information requested              |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      I0      | Reports product code                        |
   |--------------+---------------------------------------------|
   |      I1      | Reports ROM checksum                        |
   |--------------+---------------------------------------------|
   |      I2      | Reports RAM checksum                        |
   |--------------+---------------------------------------------|
   |      I3      | Reports connection duration and real time   |
   |--------------+---------------------------------------------|
   |      I4      | Reports current command settings            |
   |--------------+---------------------------------------------|
   |      I5      | Reports NVRAM settings                      |
   |--------------+---------------------------------------------|
   |      I6      | Reports link diagnostics                    |
   |--------------+---------------------------------------------|
   |      I7      | Reports product configuration               |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        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                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     RESULT CODE FORMAT                     |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Vn [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Selects word or numeric format for          |
   |              | information-text and result codes           |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      V0      | Numeric format enabled                      |
   |--------------+---------------------------------------------|
   |      V1      | Verbose (word) format enabled               |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             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.                   |
   |--------------+---------------------------------------------|
   |     i X1     | Busy and dial tone detection disabled;      |
   |              | result codes 0-5, 10, 13, and 18 enabled    |
   |--------------+---------------------------------------------|
   |      X2      | Busy tone detection disabled, dial tone     |
   |              | detection enabled; result codes 0-6, 10,    |
   |              | 13, and 18 enabled; also adaptive dialing,  |
   |              | and fast dialing enabled.                   |
   |--------------+---------------------------------------------|
   |      X3      | Busy tone detection enabled, dial tone      |
   |              | detection disabled; result codes 0-5, 7-18  |
   |              | enabled; also adaptive dialing, wait for    |
   |              | second dial tone, and wait for answer       |
   |              | enabled.                                    |
   |--------------+---------------------------------------------|
   |      X4      | Busy and dial tone detection enabled;       |
   |              | result codes 0-10, 13, and 18 enabled; also |
   |              | adaptive dialing, wait for second dial      |
   |              | tone, wait for answer, and fast dialing     |
   |              | enabled.                                    |
   |--------------+---------------------------------------------|
   |      X5      | Busy tone detection enabled, dial tone      |
   |              | detection disabled; result codes 0-5, 7-18  |
   |              | enabled; also adaptive dialing, wait for    |
   |              | second dial tone, and wait for answer       |
   |              | enabled.                                    |
   |--------------+---------------------------------------------|
   |      X6      | Busy and dial tone detection enabled;       |
   |              | result codes 0-18 enabled; also adaptive    |
   |              | dialing, wait for second dial tone, wait    |
   |              | for answer, and fast dialing enabled.       |
   |--------------+---------------------------------------------|
   |      X7      | Busy and dial tone detection enabled;       |
   |              | result codes 0-11, 13, and 18 enabled; also |
   |              | adaptive dialing, wait for second dial      |
   |              | tone, wait for answer, and fast dialing     |
   |              | enabled.                                    |
   |------------------------------------------------------------|
   | Note: Valid numeric result codes; 0-8, 10-13, and 18.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         SOFT RESET                         |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Z [cmds]                          |
   |--------------+---------------------------------------------|
   | Description: | Restores modem software default profile     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        SPEAKER MODE                        |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Mn [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Selects various speaker options             |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      M0      | Speaker disabled                            |
   |--------------+---------------------------------------------|
   |     i M1     | Speaker enabled until carrier signal        |
   |              | detected                                    |
   |--------------+---------------------------------------------|
   |      M2      | Speaker enabled                             |
   |--------------+---------------------------------------------|
   |      M3      | Speaker enabled following dialing, then     |
   |              | disabled after carrier signal detected.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       SPEAKER VOLUME                       |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Ln [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Controls speaker volume                     |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      L0      | Low volume setting                          |
   |--------------+---------------------------------------------|
   |      L1      | Low volume setting                          |
   |--------------+---------------------------------------------|
   |     i L2     | Medium volume setting                       |
   |--------------+---------------------------------------------|
   |      L3      | Highest volume setting                      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      STATUS-REGISTER                       |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | Read: AT [cmds] Sn? [cmds]                  |
   |              |                                             |
   |              | Write: AT [cmds] Sn=x [cmds]                |
   |--------------+---------------------------------------------|
   | Description: | Writes to or reads from a specified         |
   |              | register                                    |
   |------------------------------------------------------------|
   |    Command    |                  Function                  |
   |---------------+--------------------------------------------|
   |    Sn.b=x     | Write to register bit b using values 0     |
   |               | (off) and 1 (on) for x                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         TEST MODES                         |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S16=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Description: | Controls loopback tests, analog, digital,   |
   |              | remote digital, and self tests.             |
   |------------------------------------------------------------|
   |    Command    |                  Function                  |
   |---------------+--------------------------------------------|
   |     S16=0     | Testing disabled                           |
   |---------------+--------------------------------------------|
   |     S16=1     | Local digital loopback enabled             |
   |---------------+--------------------------------------------|
   |     S16=2     | Dial test (Factory testing only)           |
   |---------------+--------------------------------------------|
   |     S16=4     | Test pattern enabled (transmitted on       |
   |               | CONNECT, either on answering or originate) |
   |---------------+--------------------------------------------|
   |     S16=5     | Local analog loopback and test pattern     |
   |               | enabled                                    |
   |---------------+--------------------------------------------|
   |     S16=8     | Remote digital loopback enabled            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        TONE DIALING                        |
   |------------------------------------------------------------|
   | Type:              | Configuration                         |
   |--------------------+---------------------------------------|
   | Format:            | AT [cmds] T [cmds]                    |
   |--------------------+---------------------------------------|
   | Description:       | Enables tone dialing mode             |
   |------------------------------------------------------------|
   |      Note: This command can be duplicated with the T       |
   |      modifier in the D (Dial) command.                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   V.32 - HANDSHAKE TIME                    |
   |------------------------------------------------------------|
   | Type:        | Register                                    |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S28=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 8                                           |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | .1 second                                   |
   |--------------+---------------------------------------------|
   | Description: | Sets length of V.32 handshake               |