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CLASS
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1994-05-06
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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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