                       Zoom Modems - specs/settings

                         Don Hinds - Tech Support

     There  are  too many models, present and past of Zoom modems  to  list

each  individually. They fall into two basic groups. V-series with  V42bis,

(both  2400  and  V32(bis) models), and plain 2400 modems.


     The  plain  2400 modems are Hayes Smartmodem compatible.  The  factory

defaults  are  like  Hayes, including &C0 &D0. All  Hayes  Smartmodem  2400

settings and AT commands should work. Our recommended INIT string for  most

PC applications is AT&F&C1&D2. Use XON/XOFF flow.


     The V-series modems include 2400v42bis data/faxmodem/voice modems, and

v32(bis)  series modems. Factory defaults are the same as the 2400  modems,

with  v42bis protocol negotiation = ON, RTS/CTS = ON. The recommended  INIT

string  is  the same as the 2400 plain modems. Two exceptions:  The  'large

white'  v42bis  modem  and the v32 Turbo modem, add  S36=7  to  the  string

(default  in  all  other V-series Zoom modems). We recommend  &Q6  to  turn

v42bis protocol OFF, and &Q5 to turn it ON. In some cases (direct mode) &Q0

may replace &Q6. RTS/CTS flow &K3 = ON, &K4 = XON/XOFF, &K0 = none.


     I  would  say for almost all applications you can  devide  Zoom/modems

into  two groups. Plain 2400 Zoom, and Zoom V-series modems.  Just  include

the S36=7 for the V-series, (AT&F&C1&D2S36=7) and it will set the only  two

that  are  not that way by default, and don't affect the others,  which  do

have that default.

                                   Don Hinds - Zoom Tech
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