Velocity Edge GX440 Spécifications télécharger pdf (Page 21)

Note: Entering incorrect syntax

or a parameter outside of the

specified range may have

unexpected results.

Modem Basics

Defaults shown in the command tables are those for the

factory settings of the modem. They are not the defaults

assumed for a command issued without parameters, which are

noted in the text.

Registers

Some registers are read only. Attempting to write to them

yields an

ERROR result code.

Some registers store the setting of commands. Changing the

The table for S registers indicates the standard default values.

The factory defaults are also noted in a separate sub-section.

Responses and Result Codes

Most commands return only a result code; however, some

commands request information, which is provided by the

modem as a response prior to the result code.

Possible result codes

Result codes are not shown in the command tables unless

special conditions apply. Generally the result code

OK is

returned when the command has been executed.

ERROR may

be returned if parameters are out of range, and will be

returned if the command is not recognized, or the command is

not permitted in the current mode, state, or condition of the

modem.

See the table on page 106 for a listing of result codes.

Human vs. machine interface

The AT command interface was designed for human inter-

action. When an intelligent host is managing a modem, the

interface may need to be altered (result code words replaced

with numbers, for example). Framing characters (line feeds

and carriage returns) must be properly understood to ensure

the host system properly parses the responses and result

codes.

As shipped, the modem is configured with these settings:

• Echo enabled (E1) causes the modem to echo characters

received from the host back to it while in command state.

The backspace is echoed as

<BS> <space> <BS> in order to

erase the last character.

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Velocity Edge GX440 Spécifications Page 21

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