3-7-95
                          Setup V-Series Modems
                          High-Speed RPI modems

     The proper setup for all Zoom V-series & RPI modems... Use  AT&F&C1&D2
(&D0  for  Mac) for the init string.(for the White V42bis [2400]  or  Turbo
modems  add  S36=7  to the string) OR pick the  Hayes  2400  from  software
selection.  Set RTS/CTS =ON, Speed to 38,400 (9600+ models) or  9600  (2400
v42bis models), do NOT follow modem-connect or autobaud detect=OFF/NO or  
LOCK BAUD/BPS=YES. If your software has the option to 'drop DTR to hang-up' 
set that to YES. When you enter any AT command, that sets the port/modem 
speed, bits &  parity. If you do AT&W all current settings are saved, 
including  speed, bits,  parity & the modem will 'awaken' with those 
settings. (On RPI  modems the init string may have &Q6 or &Q0 only. No &Kx, 
%Cx, check manual for acceptable S-registers)

>>>  Do  NOT turn ON any Software protocols (V42bis/Mnp), as  the  V-Series
modem has them in hardware.  DO use software V42bis for RPI modems <<<.

     If  transfer  speeds seem off, then you want to see  true  modem-modem
connect speed rather than the default computer-modem speed, so put S95=1 in
the  init  or dial string. (S95=0 is default.) The V-Fast modems  are  more
sensitive  to local 'noise'. Make SURE your Computer is properly  Grounded.
If you have trouble downloading, make sure BUFFERS=45 or more in CONFIG.SYS

     Any program that uses ATZ in the intitialization or command string, is
expecting  that  it  is the only software that you will  be  using  on  the
computer  with that modem. As that is extremely unlikely, we disapprove  of
that  practice. Replace the ATZ with (99% of the time) AT&F&C1&D2.  Put  in
whatever  they use for a carriage return (if they show one). If  there  are
additional  parameters put them between the above string and  the  carriage
return character(s). (Most often the ^M is used for carriage return.)

    Some commands for some Hayes hi-speed modems are proprietary (not CCITT
v32bis)  so picking a Hayes hi-speed modem is not the right choice. IF  you
must pick a modem, pick a Hayes Smartmodem 2400.

     >>>   I always recommend you start any string AT&F in all programs  to
make sure it's set back to factory, eliminating any conflicting setup  from
another program. If you have trouble hanging up or negotiating try  putting
%E3  in your init (V-Series only)<<<     Some (usually old)  serial  cables
are  fine for old 2400 modems, but don't have enough pins connected  for  a
modern  'V' modem. (pins 2-8, & 20)   The cable must support hardware  flow
control.

     Some  Fax  software (Winfax for example) does not reset the  modem  to
Data  mode  when done. AT+FCLASS=0 will reset to data  mode.  The  V-Series
modems use both Class-1/2 fax, the RPI modems are Class-1.
and  NEVER  set over 19,200 in Windows, unless you have  an  alternate  com
driver like TURBOCOM.DRV. It may work, but it's unreliable.

                                   Don Hinds - Zoom Tech
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