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1994-03-29
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12-7-93 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. All V-series
Zoom Faxmodems use both Class 1 & Class 2 FAX. Non-V-series modems may be
either. Zoom/modems support (depending on model) the following standards:
CCITT - V32(bis), V42(bis), V22(bis), V21, & Bell - 103, 212A.
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, Mac AT&F&C1&D0. Use XON/XOFF flow.
The V-series modems include 2400v42bis data/faxmodem/voice modems, and
v32(bis) 9600+ modems. Factory defaults are the same as the 2400 modems,
plus 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. Set
software Autobaud =OFF, follow connect =OFF. Set v32 modems to 19,200 or
38,400, and 2400 v42bis modems to 9600 in the software.
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.
For PCs you use a straight through cable. MACs should use a
'Universal' cable. Some 'odd' system may require a null-cable.
Don Hinds - Zoom Tech
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