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5.4 Compatible Commands
All that can be used with the
modem are listed in Table 5-1
(near the end of the chapter.)
More detailed information is
provided below for selected Hayes
commands—particularly those
used to answer and originate calls,
and other commonly used
commands. For Hayes commands
that control modem options,
additional information on options
may be found in Chapter 5.
Commands are listed in
alphabetical order in this section
and in Table 5-1.
For most commands there are
parameters—numerical values used
with the commands that specify the
function of the command. For
example, the command L controls
the modem's speaker volume. L2
sets the volume to medium. The
default value is a predetermined
value which is in effect the first
time the modem is powered up or
when a reset command is given.
The possible parameters and
default value for each command
are shown in Table 5-1.
A—ANSWER. The A command
immediately puts the modem into
the answer mode. The modem will
not execute any command entered
in the command line after A.
CHAPTER 5: Hayes Emulation Mode
The A command is used to
manually answer an incoming call
or to transfer a call between two
individuals to a communication
between their computers: One
person enters AT A while the other
enters AT D.
A/-REPEAT PREVIOUS
COMMAND. A/ is most commonly
used to redial a telephone number
that results in a busy signal. The AT
prefix is not used with A/, and no
carriage return is required.
Commands are available for
repetition in the command buffer
only until AT is entered or power
to the unit is turned off. A/ will not
work following an AT or power
OFF-power ON.
D-ORIGINATE MODE FOR
DIALING. The modem dials the
number that follows and attempts
to go on-line. The dial command D
is followed by—
• A telephone number to be
dialed, or
• A string consisting of a phone
number and dial command
modifiers (e.g., T, P, and ;).
An example of the D command
is AT D3331234.
101
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