+  Details of the "Hayes" AT Command Language  +

Compiled by Tom Fernandez - June 30, 1986
Please bring any corrections/additions/deletions
to the attention of the writer.  
GEnie EMail Address        - TFERNANDEZ
MacInternational- Node #2  - SYSOP
Call MacInternational #2 - 300/1200/2400 - 24 Hrs. - (815) 965-5606
------------------------------------------------------------------------
AT Command     Function                                 Default Setting
------------------------------------------------------------------------
    A          Answer Mode                              
    
    A/         Reexcute the last command.  
    
    AT         Attention - must preceed all commands 
               except A/ and +++
    
    Cn         Transmitter ON/OFF
               C0 = Transmitter OFF (Receive only)
               C1 = Transmitter ON                             C1
    
    D          Dial the number that follows and go to 
               originate mode.  
        
        Options that may be used with D:
    
        P      Pulse Dial                                       P
        T      Touch Tone Dial
        R      Reverse Frequency
        W      Wait for second dial tone
        @      Wait for an answer
        ,      (Comma) Pause for 2 seconds
        ;      After dialing, return to cammand state while
               On-Line
        "...   Dial the letters that follow
        !      Transfer call (flash switch hook)
    En         Command mode LOCAL echo ON/OFF
               E0 = Echo OFF
               E1 = Echo ON
    Fn         Online Local echo ON/OFF
               F0 = Local echo ON
               F1 = Local echo OFF                              F1
    Hn         ON/OFF Hook control
               H0 = Hang up (go on hook)
               H1 = Go off hook
    In         Inquiry
        I0     Return product code
        I1     Return checksum
        I2     Run memory (RAM) test
        I3     Return call duration or real time (see Kn)
        I4     Return current modem settings
    Kn         Modem clock operation
               K0 = Modem time call duration (see ATI3)
               K1 = sets modem clock to real-time. Modem returns 
                    actual time with ATI3.
    Mn         Monitor speaker control
        M0     Speaker always OFF
        M1     Speaker ON until carrier is established          M1
        M2     Speaker always ON
        M3     Speaker ON after last digit dialed and until 
               carrier is established.
    O          Return on-line after screen execution
    Qn         Quiet mode: modem result messages sent to screen.
               Q0 = Result messages sent                        Q0
               Q1 = Result messages suppressed
    Sr=n       Set Register commands: n-value must a decimal
               number between 0 and 255. See S Register listing below.
    Sr?        Query register "r"
    Vn         Verbal/Numeric mode setting
               V0 = Numeric results
               V1 = Verbal results                              V2
    Xn         Extended result codes, see below.
    Z          Reset modem software & memory to default value
    +++        Escape code sequence.
    >          Repeat command.
    $          Help command summary request
    D$         Help Dial command summary request.
    S$         Help S-register summary request.
    .          Dot character   (Morse Code)
    -          Dash character  (Morse Code)
    /          Inter-character space  (Morse Code)
==============================================================================
==============================================================================
    
+-------------------------------+
+  Functions & Features of the  +
+     S-Register commands       +
+-------------------------------+
Values in prarenthesis are the ASCII Character.
Numeric values are the ASCII Decimal Code value.
------------------------------------------------------------------------------

S0      Sets number of rings before auto-answer
        Default value is usually 1.
S1      Counts & stores the number of rings from an incoming call.
S2      Sets the escape code sequence.  The default is 43.  (+)
S3      Sets the ASCII character recognized as a Carriage Return <CR>.
        The default value is usually 13.
S4      Sets the ASCII character recognized as a Line Feed.
        The default value is usually 10.
S5      Sets the ASCII character recognized as a Backspace.
        The default value is usually 8.
S6      Sets number of seconds modem will wait for a dial tone.  
        The default value is 2 seconds.
S7      Sets the number of seconds the modem is to wait for a carrier signal
        after dialing, before it sends the NO CARRIER message.
        The default value is 30 seconds.
S8      Sets the duration of the pause for the Comma (,) and the Repeat (>)
        commands.  The default value is 2 seconds.
S9      Sets the required duration, in tenths of a second, that the modem
        modems carrier signal must be present before the local modem will
        recognize it.  (Carrier Detect time).  The default value is 0.6
seconds.
S10     Sets the duration, in tenths of a second, that the modem waits after 
        loss of carrier before hanging up.  The default is 0.7 seconds.
        
        You can adjust this value upwards to defeat Call Waiting.
S11     Sets the duration and spacing of Touch-Tones during dialing.  The
        default value is 70 milliseconds.
S12     Sets the duration, in 50ths of a second, of the guard time required
        in the escape code sequence.  The default value is 1 second.
S13     Undefined and unallocated.
S14     Sets the modem product result code.  The default is 24n.
        To use Smartcom 2.0 with a 2400 baud modem, try resetting this
        value to 120.  Use S14 to re-set the the I0 request as follows.
        1)  Issue an ATS14=120 <CR> when you load Smartcom 2.0
        2)  Exit Smartcom
        3)  Reenter Smartcom.
        Smartcom 2.1 and later versions work properly with 2400 baud modems.
S15     Undefined and unallocated.
S16     Modem self testing.  The default value is 0.
        0 = Data mode - no testing
        1 = Analog loopback test
        2 = Dial test
        3 = Undefined and unallocated
        4 = Test pattern
        5 = Analog loopback and Test pattern.
        You can perform these tests at either 1200 or 2400 baud.              

HOW TO CHANGE AN S-REGISTER VALUE
---------------------------------
You may change any S-Register value.
For example...To change the default value of S-Register #7 to decrease the
amount of the the modem waits for a carrier detect before issuing the NO
CARRIER command, you would first query the default setting, and then issue
a new setting.
1)  Type the following string   ATS7=?
2)  Modem will answer with a result, usually 30 (seconds).
3)  Type the following string   ATS7=15
4)  Modem will answer OK
What you have just done will make the modem issue the NO CARRIER command if
carrier is not received within 15 seconds, instead of 30 seconds.  This is
helpful in dialing busy bulletin board systems.
===============================================================================
===============================================================================
+------------------------------+
+   The "X" Command Set of     +
+   Extended Response Codes    +
+------------------------------+
==============================================================================
RESULT CODE                                   XO   X1   X2   X3   X4   X5   X6

==============================================================================
 0-OK                                         X    X    X    X    X    X    X
 1-CONNECT                                    X    X    X    X    X    X    X
 2-RING                                       X    X    X    X    X    X    X
 3-NO CARRIER                                 X    X    X    X    X    X    X
 4-ERROR                                      X    X    X    X    X    X    X
 5-CONNECT 1200                                    X    X    X    X    X    X
 6-NO DIAL TONE                                         X         X         X
 7-BUSY                                                      X    X    X    X
 8-NO ANSWER (Req. @; replaces NO CARRIER)                   X    X    X    X
 9-RESERVED FOR FUTURE USE                    
10-CONNECT 2400                                    X    X    X    X    X    X
11-RINGING                                                             X    X
12-VOICE                                                               X    X
-----------------------------------------------------------------------------
FUNCTIONS
-----------------------------------------------------------------------------
 
 Adaptive Dialing                                       X    X    X    X    X
 Wait for second dial tone  (W)                              X    X    X    X
 Wait for ANSWER (@)                                         X    X    X    X
 Fast Dial                                              X         X    X    X 

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