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Chapter 3 Using the Faxmodem with Other Software 17
computer and the modem take place at this higher
speed, independent of the modem-to-modem speed.
The modem auto-negotiates the highest speed con-
nection between itself and the other modem.
• If there is a section of your software called “Terminal
Settings,” make sure that Hardware Flow Control
(RTS/CTS) is ON (or YES). This is necessary in order
for V.42bis file transfers to work.
• • Set auto baud detect to OFF (or NO).
• If your fax software gives you the option of selecting
Class 1 or Class 2 fax drivers, select Class 1.
• Finally, some programs ask Send init if CD high?,
which you should set to YES. Otherwise, the modem
may not receive the proper initialization string.
Initialization Strings
An initialization string is a group of AT command settings
that are sent to the faxmodem as soon as you start up the
software. (The “AT” stands for “attention.”) The software
determines which commands should be included in the
initialization string, based on the device you select during
installation. The commands remain in effect throughout
the communications session, unless the software sends
other commands to override them.
The software uses other AT command strings for all com-
mands sent to the modem. This is transparent to you—the
software does this in the background without your having
to be aware of it.
It is sometimes necessary, however, to add other AT com-
mands to initialization strings. You can find a table of AT
commands on the World Wide Web at www.modems.com.
Click on Reference and then on AT Command Sets.
Here are two of the more useful commands:
• • If your software suggests an initialization string for
this modem, you should use it. If this modem is not
listed by your software and no initialization string is
suggested, use the following: AT &F.