At Command; Description Of At Command - D-Link DMI-128ESU+ User Manual

6. AT COMMAND

6.1 Description of AT Command

Hayes command set is a standard for Hayes modem commands for its Smart modem 300. Most
modem manufactures adopted this command set in order to have Hayes compatible. The command
set used by the Smart modem 300, as well as most modems or TAs today (with a few additional
new advanced commands), is known as the AT command set. AT stands for attention, and is
placed in front of actual content of command so that the TA knows what follows is an command
directed at the modem or TA. With the exception of some "A/" and "+++" command, "AT"
command is the process to place command to the TA.
Different modems or TA's may have slightly different command sets, but generally speaking, most
of the TAs follow the standard set by Hayes.
6.1.1 AT Command
When you connect terminal equipment (like PC) with the TA, after typing AT command ending
with [ENTER] key, TA will process the command and then return the result code to the terminal
equipment. Each AT command must starts with "AT" and end with [ENTER] key (with the
exception of "A/" and "+++" commands).
Command Format
The following is the format of AT command:
AT Command
Result code has two styles (Verbose and Numeric). The following are their formats:
CR
Result code (Numeric) CR
S register
The S register is used to store the settings including
auto answer mode
escape sequence character
V.110 connect speed ..... etc.
D-LINK ISDN TA DMI-128ESU+
Value
LF Result
code(Verbose)
Command Value
CR LF
CR LF
28