User's Manual

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.