Repeating a Command, Understanding Result Codes

Modem Command Guidelines

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 enter 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.

Understanding Result Codes

A result code is the modem's response to a command. It 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 for words (default)

■V0 for numeric characters

Using Online Mode

In the online mode, the transmitting modem receives characters from the computer, converts the data to analog signals, then transmits these signals over the telephone line.

The process of altering a signal for transmission is called modulation. The receiving modem receives analog signals from the telephone when in the online mode and converts or demodulates the signal, returning it to the digital form that can be used by the computer.

4	Modem Command Guidelines (Advanced Users Only)

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