10-19-94                        Fax Class

     There  are 3 types of Zoom faxmodems. HCS/MXS - Sendfax  (send  only),
Class-1  and Class-2 (no Class 2.0). 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.  The FX9624/FX9624 are class-2. All Zoom V-series faxmodems  are  
both Class-1/2 faxmodems. 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. One such is  the  MTEZ/WPCOM  program
FAXMAN.EXE with *.FXH drivers. Call Word Perfect for those drivers.

     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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