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VSETUP
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1994-04-26
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4-11-94
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/autobaud detect=OFF/NO or LOCK
BAUD=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.
>>> 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.)
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 carraige return (if they show one). If there are
additional parameters put them between the above string and the carraige
return character(s). (Most often the ^M is used for carraige 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.
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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