20 Quick Start and Reference Guide
the computer and the modem take place at this
higher speed, independent of the modem-to-modem
speed. The modem auto-negotiates the highest speed
connection 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 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
commands 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
commands 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:
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