SPORTSTER 14,400
                             CHAPTER 7.  QUERIES AND HELP SCREENS
                                                                 
      
USER INQUIRIES (IN)

      The Inquiry command has six options.
      The most commonly used options display
      the following information.
         ATI4   Current settings
         ATI5   NVRAM settings
      I0The modem returns a product code.  If
         you have a problem and call
         USRobotics' Technical Support Depart
         ment, you may be asked for this
         product code.
      I1The modem performs a checksum of its
         read only memory (ROM) and returns
         the result to the screen.  This
         function is used only in factory
         testing.  The modem should always
         read the same number.
      I2The modem performs a test of its
         random access memory (RAM) and
         returns either the OK (0) or ERROR
         (4) result code, followed by OK when
         the test is completed.  You may want
         to use this command as a checkpoint
         if the modem appears to be
         malfunctioning.
      I3Reserved.
      I4The modem displays its current
         configuration.  Figure 7.1 on the
         following page is an example.
                                                                 
                                                                 
     Figure 7.1_Sample Current Settings Screen
                       
      I5The modem displays the configuration
         stored in nonvolatile random access
         memory (NVRAM), as in the following
         example.
         
                                                                 
                                                                 
       Figure 7.2_Sample NVRAM Settings Screen
      I6Reserved.
      I7The modem returns a product
         configuration.  If you have a problem
         and call USRobotics' Technical
         Support staff, you may be asked to
         read this screen.
         
S-REGISTER QUERY (SR?)

      This command allows you to view the
      contents of a particular S-Register, as
      in the following example that requests
      the contents of Register S0 ("On what
      ring will the modem answer?").
             ATS0? <Enter>
             
STORED PHONE NUMBER QUERY (&Z?)

      At this command, the modem returns the
      phone number stored in NVRAM, as in the
      following example that includes a sample
      modem response.
             AT&Z? <Enter>
             5551234
             
HELP SCREENS

      Sportster 14,400 modems provide four
      Help screens:  summaries of the basic
      AT command set, extended ampersand (&)
      command set, Dial command options, and
      S-Register functions.
      
Stop/Restart Display

      The following command stops the display.
      Hold down the Control key and type "S".
             <Ctrl>-S
      To restart the display, use the same
      command or press <any key>.
Cancel Display

      Either of the following commands cancels
      the display.
             <Ctrl>-C
             <Ctrl>-K
             
Basic Command Set ($)

      At AT$, the Sportster 14,400 displays a
      screen that shows a partial summary of
      the command set.  A second screen, acti
      vated by pressing any key, shows the
      remaining commands.  The first screen
      is shown in Figure 7.3.
      
                                                                 
                                                                 
    Figure 7.3_Sample Basic Commands HELP Screen

Ampersand Command Set (&$)

      At AT&$, the Sportster 14,400 displays a
      screen that shows a partial summary of
      the extended ampersand command set.  A
      second screen, activated by pressing any
      key, shows the remaining command set.
      The first screen is shown in Figure 7.4.
                                                                 
                                                                 
  Figure 7.4_Sample Ampersand Commands HELP Screen

Dialing (D$)

      At ATD$, the Sportster 14,400 displays
      the Dial command summary.
      
                                                                 
                                                                 
     Figure 7.5_Sample Dial Command HELP Screen
S-Register Functions (S$)

      At ATS$, the Sportster 14,400 displays
      a screen that shows a partial summary
      of the S-Register functions.  A second
      screen, activated by pressing any key,
      shows the remaining registers.  The
      first screen is as follows.
      
                                                                 
                                                                 
      Figure 7.6_Sample S-Register HELP Screen