Compaq Armada 7300 33.6Kbps Modem Commands for Armada 7000 Family of Personal - Page 3

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CHAPTER 1— U

SING

M

ODEM

C

OMMANDS

Entering a Command

Use the following guidelines when issuing modem commands:

When using AT commands, start every command line (except the A/ and +++ commands)

with the attention (AT) code characters; otherwise, the modem will not execute the

command.Compaq Hardware

Type commands following the AT prefix in uppercase or lowercase letters or a combination

of both.

Always type the AT prefix in the same case (not At or aT).

Enter telephone numbers with or without punctuation; for example,

(123) 456-7890 or 1234567890

Editing and Executing a Command

If you make an error while typing a command, simply backspace over the mistake then retype.

You cannot backspace over the AT prefix because it is interpreted immediately after it is typed.

To execute a command line, press the

Enter

key. (Pressing the

Enter

key tells the modem to

process the command line.)

Omitting a Parameter in a Command Line

If you enter a command that normally includes a numeric parameter, such as ATHn, without the

numeric parameter, the missing parameter is assumed to be the default parameter.

For example, the Hn (hang-up) command can have a numeric parameter of zero

(

H0),

which is

the default, or of one

(H1);

however, if the parameter is missing,

ATH

plus the

Enter

key is the

equivalent of

ATH0

plus the

Enter

key. This rule does not apply to the D (dial) command.

Repeating a Command

You can repeat the last command line issued by entering the A/ command. Because it also

repeats the AT prefix and the

Enter

key function, you are not required to enter the AT prefix or

press the

Enter

key when repeating this command.

The last previously entered command remains in the command buffer until the modem is reset or

power to the modem is turned off. Both actions clear the buffer and make the A/ command

invalid since there is no command for the modem to repeat.

Understanding Result Codes

A result code is modem response to a command and may be issued in either of two possible

formats: words (the long form, also known as verbose) or numeric characters (the short form,

represented by digits). The result code format is set using the Vn command.

V1 (default) for words.

N

OTE

:

The modem ignores all characters

that precede AT.

N

OTE

:

A maximum of 255 characters

can follow the AT command. The

modem doesn't count the AT

prefix or carriage return (<cr>)

character. It does count, but

doesn't act on, punctuation such

as quotation marks and tildes. If a

command sequence exceeds the

255-character maximum, the

modem does not execute any part

of the command line and returns

an error message after the <cr>.

If this occurs, reentering the

command within the 255-

character limit executes the

command.

N

OTE

:

Punctuation in the telephone

number does take up space set

aside for command storage.

N

OTE

:

Word codes are preceded and

followed by the characters set in

registers S3 and S4, which are

typically the factory defaults: a

carriage return and a line feed

(LF) control character,

respectively.

Compaq Armada 7300 33.6Kbps Modem Commands for Armada 7000 Family of Personal - Page 3

Entering a Command, Editing and Executing a Command, Omitting a Parameter in a Command Line,

Page 3 highlights