Compaq Global Mini PCI 56k (V.90) Modem by 3Com

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Using Modem Commands

Entering a Command

Use the following guidelines when issuing modem commands:

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

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

∙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) 456-7890or 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 command entered 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.

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