PW>> stuff" via an AT command?  There must be some sort of
"trigger" to get

 PW>> the modem into "update Flash ROM" mode?

 RB>> It has a "Boot strap" similar to booting a computer.



 PW> Righto.  So how does it do that -- does the program send an AT command of

 PW> some sort???



2 ways to install an SDL



1. you type SDL at the DOS prompt

   It finds the modem and the com port

   does a Chksum

   Deletes the old Flashed code

   Uploads the new code

   Does another Chksum

   Resets the modems Settings and saves them to NVRAM

   Exits



2. You just put the XSDL in a directory that you know your comms prog

   can access

   Go into your (any) Terminal program that supports X-Modem protocol

   Type AT~x!

   SDL Xmodem file transfer - (Y)es (N)o (T)est >



Respond with a 'Y'

Read it first hand for your self............

                                            

          ----------------------------------------------------



                  Courier V.Everything Xmodem SDL Notes



          ----------------------------------------------------



In order to better support users of non-DOS systems, the Courier can now

perform flash ROM updates via the Xmodem file transfer protocol found in

most communications software.



Modems already in the field must first use SDL.EXE to install the new

firmware code as usual.  After installing this SDL, the AT~X! command

will be enabled.  If the flash ROM should ever get corrupted or downgraded,

the Xmodem SDL feature will be lost, and SDL.EXE will have to be used to

return the modem to normal operation.



Modems that come from the factory with this SDL installed will always have

Xmodem SDL available, even in the event of flash corruption or downgrade.



1018828.XMD is the Xmodem mode flash data file.   (This is the same

firmware that is in the SDL.EXE file, but in a different format.) This

is the file that you will send to the modem in Xmodem mode.  The file

supplied with this release is for US/Canada versions of Courier internal,

external, PS/2, and Comserver modems.



          ----------------------------------------------------



          Sending New Firmware to the Courier using Xmodem SDL



          ----------------------------------------------------



1.  Start a communications software package, such as Quick Link II or

    MacComCenter.  Adjust the settings, if necessary, so that you can

    send AT to the Courier and get an OK response.  NOTE:  If you are

    sending the file from a Macintosh computer, make sure that you do

    NOT transfer the file in MacBinary format.  In MacComCenter, for

    example, select Setup -> File Transfer and under MacBinary options,

    select "Never MacBinary."



2.  Type AT~X! .  The Courier will respond as follows:





at~x!



SDL Xmodem file transfer - (Y)es (N)o (T)est >





    Responding with 'Y' will begin the file transfer process; responding

    'N' will abort the process and the modem will return to command mode.



    ***********************************************************************

    *                                                                     *

    * Responding with 'T' will begin the file transfer process in a       *

    * "safe test mode".   Test mode will verify the operation of
the file *

    * transfer process and the integrity of the .XMD flash data file,     *

    * without actually erasing or re-burning the flash chip.              *

    *                                                                     *

    ***********************************************************************





3.  Respond with 't' to start an integrity test of the XMD file, or

    'y' to begin an actual update of the flash ROM.





SDL Xmodem file transfer - (Y)es (N)o (T)est >t

* Test Mode - Flash ROM will not be modified*

Begin Xmodem file transfer now.

CC





    The Courier will begin sending 'C' characters which are used as part

    of the Xmodem protocol handshaking.



    You may now begin sending the .XMD file to the Courier using the

    XMODEM-CRC or XMODEM-Checksum protocol in your communications software.



4.  After completion of the file transfer, the modem will display a result

    message.





at~x!



SDL Xmodem file transfer - (Y)es (N)o (T)est >t

Begin Xmodem file transfer now.

CC



SDL Xmodem file transfer completed.

Calculating CRC... OK

Resetting modem...OK





    Once you see the OK response to the Calculating CRC and Resetting modem

    messages, your software upgrade is complete, and the modem will reset

    and return to command mode.





          ----------------------------------------------------



                       The Bootstrap Downloader



          ----------------------------------------------------



    If the flash ROM should ever become corrupted, or the modem will not

    respond to Xmodem or SDL.EXE download attempts, follow this procedure to

    activate the flash ROM bootstrap downloader:



1.  Power the Courier off.



2.  Set DIP switches 1, 5, and 10 on and 8 off.  (For internal modems, use

    1, 5, and 10 on, and 7 off.)  The settings of the other DIP switches

    are ignored.



3.  Power the Courier on.



4.  Start your communications software package and send the operating

    software using the XMODEM protocol, or use SDL.EXE as with previous

    versions of the Courier firmware.



5.  Power the Courier off.



6.  Reset the DIP switches to their previous settings.



7.  Power the Courier on.





[End]





Russell

--- Terminate 4.00/Pro