10-14-94                        Hayes Compatibility

     Zoom/modems default to Hayes defaults (&C0 &D0) and all are Hayes 2400
Smartmodem  command compatible. Most software used with Zoom/modems  should
be set with the setup STRING for a Hayes Smartmodem 2400, typically this is
>>> AT&F&C1&D2 <<< or pick Hayes 2400 from the selection. All PCs need  the
&C1&D2  - >>> Macs use AT&F&C1&D0   << in the string. If any  software  has
saved a string and uses ATZ for an initialization, type AT&F&W in  terminal
mode  to  restore  to factory defaults. Then remove the ATZ  &  type  in  a
correct string for that software. Use XON/XOFF flow control, or NONE.  (You
can also try &C0 in a MAC if you still have a problem). Most common setting
N,8,1  then E,7,1.

     To set speed in a non-V 2400 modem, just set the speed in the software
and  type any command to the modem. Or call the modem (with it set  to  AA)
and the modem will answer at the caller's speed. Either case sets the modem
speed.  There  are  no commands to set the  speed.  The  Only  non-standard
command from Hayes, is AT+FCLASS=0 to rest to DATA after fax. (fax software
nirmally does this upon exit).

     If  you  have a Hi-speed Zoom modem (V series), use the  same  string.
Then  lock (autobaud =OFF) DTE BPS 19,200, set CTS/RTS flow. In some  cases
you also want S95=1 (to pass true connect speed, default is 0 which  passes
DTE connect speed) and to turn OFF flow control, &K0, or for XON/XOFF &K4.

     All   Zoom external modems use standard RS232 connections. A standard
straight  through  25  pin  cable,  or standard 9-pin  to  25  pin  or  Mac
'Universal' cable is used.

                               Don Hinds - Zoom Tech
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