     APPENDIX C.  ALPHABETICAL COMMAND SUMMARY

      

      Additional command summaries are on the
      bottom panel of the modem and in the
      Quick-Reference Card.

REQUIREMENTS

         1.    Type commands in either upper
           or lower case, not a combination.
         2.    All commands except A/, A> and
           +++ are preceded by the AT prefix
           and are executed with the
           Enter/Carriage Return key
           (<Enter>).
         3.    Command length = 40 characters
           maximum.  The modem doesn't count
           the AT prefix, Carriage Return
           character, or spaces.  It counts
           but doesn't act on punctuation such
           as hyphens and parentheses.
         4.    A missing numeric parameter is
           assumed to be zero, as in the
           command to hang up:  ATH <Enter> is
           the equivalent of ATH0 <Enter>.
         

BASIC COMMAND SET

&     See the Extended Command Summary that
      follows this Basic Set.

%     See the Percent Command Summary that
      follows the Extended Command Summary.

A     Force Answer mode when the modem hasn't
      received an incoming call.

A/    Re-execute the last issued command one
      time.  A/ doesn't take the AT prefix or
      a Carriage Return.
A>    Re-execute the last issued command
      continuously until canceled by pressing
      <any key>.  Dial strings are re-executed
      ten times, after which execution
      terminates.  A> doesn't take the AT
      prefix or a Carriage Return.

Any key   Terminate current dialing operation
      resulting from an issued Dial command;
      terminate Repeat mode (> or A>).

AT    Attention:  lets the modem know commands
      are being issued to it.  Must precede
      all other commands except A/, A> and
      +++.

Bn    Handshake options.

      B0  a)  V.32 bis modulation (includes
          V.32 answer tones).  Courier V.32
          bis:  Default.  Courier HST Dual
          Standard:  Required to answer V.32
          bis calls.  To call V.32 bis modems,
          may be set to B0 or B1.  HST
          modulation remains enabled.  Courier
          HST:  See next paragraph.  HST
          modulation remains enabled.

          b)  CCITT V.25 answer sequence.
          Required for all Courier modems
          answering overseas calls at 1200 bps
          and above.

      B1  a)  HST modulation (no V.32 bis
          answer tones).  Courier HST:
          Default.  Courier HST Dual Standard:
          Default.  Also calls, but does not
          answer, V.32 bis modems.  Courier
          V.32 bis:  Calls, but does not
          answer, V.32 bis modems.

          b)  Bell answer tone, United States
          and Canada.
Cn    Transmitter enabled/disabled.

      C0  Transmitter disabled; receive-only
          condition.

      C1  Transmitter enabled (Default).

D     Dial the number that follows and enter
      Originate mode.  Optional parameters:

      P   Pulse dial (Default).

      T   Touch-Tone dial.

      ,   (Comma) Pause for 2 seconds.

      ;   Return to Command mode after
          dialing.

      "   Dial the letters that follow.

      !   Transfer call (flash switch-hook).

      W   Wait for second dial tone (with X3
          or higher).

      @   Wait for an answer (with X3 or
          higher).

      R   Reverse frequencies.

      DL  Dial the last-dialed number.

DSn   Dial the phone number stored in NVRAM at
      position n (n = 0-3).

En    Command mode local echo (display) of
      keyboard commands ON/OFF.  DIP switch 4
      is factory set to Command mode echo ON.

      E0  Local echo OFF.

      E1  Local echo ON.
Fn    Online local echo of transmitted data
      ON/OFF.  Sometimes referred to as the
      Duplex setting.

      F0  Local echo ON.  Sometimes called
          Half Duplex.  Modem sends a copy to
          your screen of data it sends to the
          remote system.

      F1  Local echo OFF (Default).  Sometimes
          called Full Duplex.  Receiving
          system may send a remote echo of
          data it receives.

Hn    On/off hook control.

      H0  Hang up (go on hook).

      H1  Go off hook.

In    Inquiry.

      I0  Display product code.

      I1  Display results of ROM checksum.

      I2  Display results of RAM test.

      I3  Display call duration or real time
          (see Kn).

      I4  Display current modem settings.

      I5  Display nonvolatile random access
          memory (NVRAM) settings.

      I6    Display link diagnostics.

      I7    Display product configuration.

Kn    Modem clock operation:  Call-duration or
      Real-time mode.
      K0  Return call duration at ATI3
          (Default).

      K1  Return actual time at ATI3.  Clock
          is set using ATI3=HH:MM:SS K1.
Mn    Monitor (speaker) control.

      M0  Speaker always OFF.

      M1  Speaker ON until carrier is
          established (Default).

      M2  Speaker always ON.

      M3  Speaker ON after last digit dialed
          and until carrier is established.

O     Return online after command execution.

      O0  Return online (normal).

      O1  Return online and retrain.  Use if
          there were errors in a non-ARQ data
          transfer.

      O2  Return online, initiate a 2400 bps
          speed shift, and drop down to 1200
          bps.  Applies only to calls at 2400
          bps, and may be used if the remote
          modem is a V.22 bis modem and ATO1
          didn't work.  Used mainly for
          testing purposes.

P     Pulse dial (Default).

Qn    Quiet mode:  result codes
      displayed/suppressed. DIP switch 3 is
      factory set for result code display.

      Q0  Result codes displayed.

      Q1  Result codes suppressed (quiet).

      Q2  Result codes suppressed in Answer
          mode.
Sr=n  Set S-Register value:  r is any S-
      Register; n must be a decimal number
      between 0 and 255.

Sr.b = n  Alternative command for setting bit-
      mapped registers:  r is the bit-mapped
      register; .b is the bit; n is 0 (off) or
      1 (on).

Sr?   Query contents of register r.

T     Tone dial.

Vn    Return result codes in words or numbers
      (Verbal/Numeric mode).  DIP switch 2 is
      factory set for verbal result codes.

      V0  Numeric mode.

      V1  Verbal mode.

Xn    Result code set options.  Use the
      following table (Default = X1, Extended
      set, codes 0-5, 10, 13, 18).
                               Setting  
      
      Result Codes    X0 X1   X2   X3   X4   
      X5              X6 X7
      
      0/OK            +  + +  + +  + +  +
      1/CONNECT       +  + +  + +  + +  +
      2/RING          +  + +  + +  + +  +
      3/NO CARRIER    +  + +  + +  + +  +
      4/ERROR         +  + +  + +  + +  +
      5/CONNECT 1200     + +  + +  + +  +
      6/NO DIAL TONE       +    +    +  +
      7/BUSY                  + +  + +  +
      8/NO ANSWER             + +  + +  +
      9/RESERVED
      10/CONNECT 2400    + +  + +  + +  +
      11/RINGING                   + +  +
      12/VOICE                     + +  
      13/CONNECT 9600    + +  + +  + +  +
      18/CONNECT 4800    + +  + +  + +  +
      20/CONNECT 7200      +  + +  + +  +    +
      21/CONNECT 12000     +  + +  + +  +    +
      25/CONNECT 14400     +  + +  + +  +    +
      43/CONNECT 16800 (HST)    +  + +  +    +    
      +               +
      
      Functions
      
      Adaptive Dialing        + +  + +  +    
      +
      Wait for 2nd Dial Tone (W)             +    
      +               +  + +
      Wait for Answer (@)          + +  +    +    
      +
      Fast Dial            +    +    +  +

      NOTE:  Use &A0 or &A1 to disable/enable
      the following ARQ result codes.  The
      default is &A1, ARQ codes (messages 14
      to 19) enabled.
          14/CONNECT/ARQ  22/CONNECT 12000/ARQ
          15/CONNECT 1200/ARQ 24/CONNECT
          7200/ARQ
          16/CONNECT 2400/ARQ 26/CONNECT
          14400/ARQ
          17/CONNECT 9600/ARQ 47/CONNECT
          16800/ARQ
          19/CONNECT 4800/ARQ 

      Use &A2 to add HST or V.32 modulation
      indicators, as well as ARQ and non-ARQ
      status, to the result codes.

      Use &A3 to add error control protocol
      indicators (LAPM, HST, MNP, SYNC, or
      NONE) and data compression type (V42BIS
      or MNP5) to the result codes.

Z     Software reset to NVRAM settings if DIP
      switch 10 is UP, to factory settings if
      DIP switch 10 is DOWN.  Also initiates
      new settings of DIP switches 2-5, 7 and
      9.

+++   Escape code, preceded and followed by a
      guard time of at least one second of no
      data transmission.  The modem responds
      to +++ by returning to Command mode and
      doing the following:

      DIP switch 9 UP (OFF, Factory setting):
      Hangs up and sends NO CARRIER result
      code

      DIP switch 9 DOWN (ON):  Retains phone
      line connection and sends OK result code

>     Repeat the command continuously until
      canceled by pressing <any key>.  If used
      in a Dial string, automated redialing
      terminates after ten attempts.

/     (Slash) Pause 125 milliseconds.

$     Help Basic command summary request.
&$    Help Extended command summary request.

D$    Help Dial command summary request.

S$    Help S-Register summary request.

<Ctrl>-S  Stop/restart display of Help
      screens.

<Ctrl>-C  Cancel display of Help screens.
or
<Ctrl>-K


AMPERSAND COMMAND SET

&An   Enable/disable additional result code
      subsets.  See the X command in the
      previous section.

      &A0 ARQ result codes disabled.

      &A1      ARQ result codes enabled.
          Default.

      &A2 Additional HST or V32 modulation
          indicator.

      &A3 Additional error control indicator
          (LAPM, HST, MNP, SYNC, or NONE) and
          data compression type (V42BIS or
          MNP5).
&Bn   Data Rate, terminal-to-modem (DTE/DCE).

      &B0 DTE/DCE rate switches to follow
          connection rate (Default).

      &B1 DTE/DCE rate remains fixed at the
          DTE setting.  Allowable rates are
          38.4K, 19.2K, 9600, 4800, 2400,
          1200, 300 bps.

      &B2 Shift to the user-defined fixed,
          higher DTE rate for ARQ calls,
          follow the connection rate for non-
          ARQ calls.  Answer mode only.

&Cn   Carrier Detect (CD) signal, modem-to-
      DTE.  DIP switch 6 is factory set so
      that the modem controls CD and the
      override is disabled.

      &C0 CD override (CD always ON).

      &C1 Modem sends CD signal when it
          connects with another modem, drops
          CD on disconnect.

&Dn   Data Terminal Ready (DTR) signal, DTE-
      to-modem.  DIP switch 1 is factory set
      for normal DTR operations and the
      override is disabled.

      &D0 DTR override (DTR always ON).

      &D1 Reserved.

      &D2 Terminal must send DTR for modem to
          accept commands.  Dropping DTR
          terminates a call.

&F    Load factory (ROM) settings into random
      access memory (RAM).
&Gn   Guard tone as part of answer sequence,
      for 2400/1200 bps calls from overseas.

      &G0 No guard tone, U.S., Canada
          (Default).

      &G1 550 Hz guard tone, some European
          countries.

      &G2 1800 Hz guard tone, U.K., some
          Commonwealth countries.  Requires B0
          setting.
&Hn   Transmit Data flow control.

      &H0 Flow control disabled (Default).

      &H1 Hardware (Clear to Send) flow
          control.

      &H2 Software (XON/XOFF) flow control.

      &H3 Hardware and software flow control.

&In   Received Data software flow control.

      &I0 Flow control disabled (Default).

      &I1 XON/XOFF to local modem and remote
          computer.

      &I2 XON/XOFF to local modem only.

      &I3 Host mode, Hewlett Packard protocol.

      &I4 Terminal mode, Hewlett Packard
          protocol.

      &I5 Same as &I2 in ARQ mode.  In non-ARQ
          mode, XON/XOFF to remote modem for
          link flow control.

&Kn   Data compression.

      &K0 Disabled.

      &K1 Auto enable/disable (Default).
          Disabled if modem is set to &B0 and
          DTE rate switches to match link
          rate.

      &K2 Enabled regardless of &Bn setting.

      &K3 Selective data compressionMNP Level
          5 disabled.
&Ln   Normal/Leased phone line.

      &L0 Normal phone line (Default).

      &L1 Leased line; enables the modem to
          reconnect if disconnected.

&Mn   Error Control (ARQ) and Synchronous
      Operation.

      &M0 Normal asynchronous mode, error
          control disabled.

      &M1 Synchronous mode, error control
          disabled.

      &M2 Reserved.

      &M3 Reserved.

      &M4 Normal/ARQ asynchronous mode
          (Default).  Normal connection if ARQ
          connection cannot be made.

      &M5 ARQ asynchronous mode.  Modem hangs
          up if ARQ connection cannot be made.

&Nn   Link Rate (DCE/DCE) variable or fixed.
      With fixed link rate, modem hangs up if
      called or calling modem is operating at
      a different rate.

      &N0 Variable link operations (Default).
          Modem negotiates highest possible
          link rate with remote modem.

      &N1 300 bps.

      &N2 1200 bps.

      &N3 2400 bps.

      &N4 4800 bps.
      &N5 7200 bps.

      &N6 9600 bps.

      &N7 12K bps

      &N8 14.4K bps

&Pn   Pulse dialing make/break ratio.

      &P0 U.S./Canada make/break ratio
          (Default).

      &P1 U.K./some Commonwealth countries
          make/break ratio.

&Rn   Received Data hardware (RTS) flow
      control.

      &R0 Delay before modem responds to DTE's
          RTS signal with CTS signal.  Delay
          is set in Register S26.

      &R1 Ignore RTS (Default).

      &R2 Received data sent to DTE only when
          RTS is high; used only if DTE
          supports RTS signaling.

&Sn   Data Set Ready (DSR) operations.

      &S0 DSR override, always ON (Default).

      &S1 Modem sends DTE a DSR signal when it
          senses a modem tone on the phone
          line.

      &S2 On loss of carrier, modem sends DTE
          a pulsed DSR signal with Clear to
          Send (CTS) following Carrier Detect
          (CD).
      &S3 This is the same as &S2, but without
          CTS following CD.

&Tn   Modem testing.

      &T0 End test.

      &T1 Initiate Analog Loopback (AL)
          testing.

      &T2 Reserved.

      &T3 Initiate Local Digital Loopback
          (LDL) testing.

      &T4 Grant Remote Digital Loopback (RDL).

      &T5 Prohibit RDL.

      &T6 Initiate RDL testing.

      &T7 Initiate RDL with self-test and
          error correction.

      &T8 Initiate AL with self-test and error
          correction.

&W    Write current settings to nonvolatile
      random access memory (NVRAM).

&Xn   Synchronous Timing Source.  This
      specifies whether the modem or DTE
      generates the timing signals for the
      Transmit clock during a synchronous
      call.

      &X0 Modem's Transmit clock is the source
          (Default).

      &X1 DTE is the source.

      &X2 Modem's Receiver clock is the
          source; valid only in V.32 bis mode
          or for 2400/1200-bps connections in
          HST mode.

&Yn   Break handling.  Destructive Breaks
      clear the buffer; expedited Breaks are
      sent immediately to the remote system.
      Under data compression, destructive
      Breaks cause both modems to reset their
      compression tables.

      &Y0 Destructive, don't send Break.

      &Y1 Destructive, expedited (Default).

      &Y2 Nondestructive, expedited.

      &Y3 Nondestructive, unexpedited; modem
          sends Break in sequence with data
          received from DTE.

&Zn = s   Write the following Dial string (s)
      to NVRAM at position n
      (n = 0-3).
&Zn?  Display the phone number stored in NVRAM
      at position n
      (n = 0-3).


PERCENT COMMAND SET

%Rn   Rack Controller Unit (RCU) access.  For
      use with USRobotics Total Control Modem
      Management Systems.

      %R0 Normal operations, RCU access
          disabled (Default).

      %R1 RCU access enabled.

%T    Touch-Tone Recognition mode enabled.
