
#: 44040 S1/Forum Help  [CBMAPP]
    25-Sep-97  18:54:15
Sb: settings
Fm: Jeffrey Starai 76352,2460
To: [F] Sid Davis 102541,420

  Here are the changes to the Desterm setup for working with high-speed
modems. You also have to change the modem setup, enabling software flow
control (XON/ XOFF), disabling hardware flow control (RTS/CTS) and setting to
"locked baud ra e" or "locked port rate" or "fixed serial port rate".

-Protocol settings
  -Baud rate = 38400 for Swiftlink, Commport and Turbo 232, and 57600
               for Hartcart.
  -XON/XOFF  = Yes

-Modem settings
  -Hayes/1670 setup
   -Max baud rate  = 38400 for Swiftlink, Commport and Turbo 232, and
                     57600 for Hartcart.
   -Set connect rate = No
   -Initial sequence = See below

-Transfer options
  -Incoming XOFF = Honour

-Phone list
 -Baud rate = Max or 38400 for Swiftlink, Commport and Turbo 232, and
              57600 for Hartcart.

The initialization strings below configure the modem:

  For US Robotics Sportster modems:
  ATZ^m~~~AT &B1 &H2 &I2 &R1^m

For Boca and other modems using the Rockwell chipset:

  ATZ^m~~~~AT &K4^m

 You can also save the configuration to the modems NVRAM and use just ATZ^m
as the initialization string.


 Sometimes when you try to upload a file the transfer aborts and the BBS
seems frozen. That happens because of XON/XOFF. When it happens you have just
to press ^Q ( control-q ) and it'll be alive again.

  When the modem is set to XON/XOFF it acts on control characters 17 (XON)
(^Q) and 19 (XOFF) (^S) for controlling the data flow between the modem and
the computer. If the file you're trying to upload has a character 19 on it,
mainly binary and archived files, or the protocol itself sends a character 19
the modem interprets the character as a XOFF and stops recieving data until
it recieves a XON. So, before uploading you have to disable XON/XOFF in the
modem. First you have to put the modem in command mode by sending the escape
string, +++, then you send the command for disabling XON/XOFF, put the modem
back in online mode and do your upload. When the upload is finished you do
the same thing but you send the command for enabling XON/XOFF instead. It's
more easily done than explained. You can do what I do and put the commands in
function keys. This way you have just to press a few keys to have it done and
don't need to remember the commands.

The Sportster commands are:
 -Disable XON/XOFF: &I0
 -Enable XON/XOFF:  &I2
 -Go to online mode:O

In the function keys you have to use:
 -Disable XON/XOFF and go to online mode: AT&I0O^m
 -Enable XON/XOFF and go to online mode:  AT&I2O^m

The Boca and other Rockwell-chipset-based modem commands are:
 -Disable XON/XOFF:  &K0
 -Enable XON/XOFF:   &K4
 -Go to online mode: O

In the functio keys you have to use:
 -Disable XON/XOFF and go to online mode:  AT&K0O^m
 -Enable XON/XOFF and go to online mode:   AT&K4O^m


When you send the escape sequence (+++) for putting your modem into command
mode, some remote modems also interpret the three "+" as an escape sequence
and also go into command mode. When that happens your connection with the
remote modem is "frozen". The easiest solution for that problem is changing
the escape character from "+" to another character. The one I've chosen is
"@". To change it run Desterm and change the initialization string to:
  ATZ^m~~~AT &B1 &H2 &I2 &R1 S2=64^m

for US Robotics modems, and ATZ^m~~~~AT &K4 S2=64^m for
Rockwell-chipset-based modems.

The S2=64 command changes the escape character from "+" to "@". Now for
putting you modem in command mode you have just to send @@@ instead of +++.
You should also change the hangup sequence in Desterm to: ~~~@@@~~~ATH^m.

Ismael
-----------------------------------------------------------------------------
-- This is a copy of a message I recieved from Ismael Cordeiro from Canada. I
don't know his address. I have set my system up according to this and have
had no problems whatsoever.

Jeff
 e
