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5.0 Hayes Emulation Mode
For most commands, there are parameters—numerical values used with
the command specifying 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 — Quick 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.
The A command is used to transfer a call between two individuals to a
communication between their computers: One person enters A while
the other enters D.
• A/ — Repeat Previous Command. A/ is most commonly used to redial
a busy telephone number. 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 after the power has been turned
off and back 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
either 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 shown below:
AT D3331234.
In response to the command above, the Modem dials the telephone
number 333-1234, and then waits for a carrier tone from the remote
modem (default wait time is 30 seconds). If the modem is able to establish
a call, it gives a CONNECT result code, indicating that it is on-line. If it
cannot connect, it issues a different result code, such as NO CARRIER,
BUSY, or NO DIALTONE. The characters that can be dialed are 0
through 9, A, B, C, D, #, and *.
• AT D — the dial command without a telephone number causes the
modem to pick up the telephone line without dialing a number.
• DS —Dial Stored Number. The DS command instructs the Modem to
dial a telephone number or dial string previously stored using the &Z
command. The syntax is DS=m, with m specifying the memory location
where the dialed number will be stored. Up to ten numbers may be stored
in memory locations 0-9. S=m may be placed anywhere in the dial string;
for example, AT D2345S=2 dials 2345 and the number is stored in
memory location 2.