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5-13821-A2-GB20-30 February 1998
Fax Operation
Overview 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fax Operation 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
The procedures for sending and receiving facsimile
documents with your modem depend on the fax software
you use. This chapter does not contain specific
procedures, but rather information that may make it easier
for you to use the documentation that came with your fax
software.
Fax Operation
Your modem, in combination with your computer and
fax software, is capable of emulating the functions of a
fax machine. You can use it to send and receive fax files
in communication with another fax modem, or with a
standard fax machine. These fax files are images turned
into the sort of data that can be stored in your computer.
Fax machines and fax modems use special protocols
different from those used by standard modems. The
device you intend to communicate with must be
compatible with your modem, which means that it must
be capable of using the same protocol. Your 3821Plus
modem supports Class 1 (EIA 578) and Class 2 (EIA/TIA
SP-2388) Group III fax, using V.17, V.29, or V.27ter
modulations.
Before you can send or receive a fax, the following
must be true:
• Your modem must be online with a compatible fax
modem or fax machine.
• You must have fax software installed on your
computer.
• You must have configured your modem according
to the specifications of your fax software manual.
For example:
— Some fax software requires that the modem
have Auto-Answer disabled. You can set this
with the ATS0=0 command.
— Some fax software requires that the modem use
software flow control. You can set this with the
AT \ Qn command.
— DTR Action should be set for standard
RS232-D operation. Use the AT&D2
command.
— LSD (Line Signal Detect) Control should be set
for standard RS232-D operation. Use the
AT&C1 command.
If your fax software requires that you change the
configuration of your modem, see the appropriate sections
of Chapter 4, AT Commands and S-Registers.
Your fax software uses AT commands to tell the
modem what to do. These commands, and the replies your
modem makes (such as “OK”), may be displayed on your
computer terminal during fax operation, but this depends
on your software. You do not have to issue AT commands
yourself, unless you use AT commands to configure the
modem.
For more information about fax operation, see the
manual that came with your fax software.
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