4-27-94                         Fax Class

     There  are 3 types of Zoom faxmodems. HCS/MXS - Sendfax  (send  only),
Class-1  and  Class-2. The software you use has to match the type  of  fax-
modem.  Class  refers to the way the Software talks to the modem,  not  the
kind  of  fax machine. Class-1 the software does most of  the  negotiating,
Class-2  the  modem  does  the work. All fax  machines  should  be  Group-3
compatible,  and all 'class' modems make group-3 compatible fax files.  HCS
and  MXS are send-only. AFC/AFX/Pkt-2400 and the 14.4 RPI are Class-1.  All
other  Zoom Faxmodems are Class-2. You can try Class-1 with  Zoom  V-series
modems  too. You can try AT&F&C1&D2 as an init string. Usually set  RTC/CTS
flow (can try xon/xoff). Sometimes &K4 helps.

     Class-1  fax does the negotiating in the computer, rather than in  the
modem.  I doubt in a modern computer (486 +) it will slow the  computer  at
all. Sometimes class-1 negotiates better, sometimes class-2 does. I  always
use Class-2 as my default and try Class-1 if I have a problem. There is  no
speed  difference.  Most class-1 (only) modems send at 9600 but  will  only
rec'v at 4800.

     HC2400R/MX2400R  are  data-only  modems, as are  modems  with  the  TI
chipset, and old full-card 2400/1200 modems.

     No  Zoom FaxModem is CAS compatible without a proper CAS  driver  that
works with class-1 or 2 faxmodems.

     To set to a mode    AT+FCLASS=1  (or 2 or 0).

                BTW: Class=0 is no-class-fax, or DATA mode.

                                   Don Hinds - Zoom Tech
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