AT Command Operation
CREATING A COMMAND STATEMENT: AT
To create a command statement, use the following steps:
1.Type AT, the attention code telling the unit a command statement follows.
2.Type the command.
3.Press the return key to “Enter” or send the command statement to the TA.
An example of a command statement using the dial command
(D) follows.
ATD555-1212
This statement can be read as: Attention: dial
Another example: Enter ATZ. This means “Attention: reset the
TA and reload current configuration with stored values.”
After entering a command line the TA returns a response message indicating whether the command was accepted, or by giving the data requested by the command line.
The AT command also sets some of the TA’s DTE data parameters, such as DTE speed, parity, and bits per character to match the DTE. This process is repeated each time the AT prefix is typed.
COMMAND STATEMENT GUIDELINES
When typing command statements, the following rules apply:
•Return must be pressed to execute (Enter) a command.
•The command buffer can hold 128 characters including spaces.
•Use the backspace or delete key to erase the last character.
MONITOR DISPLAY
As commands are typed they normally appear on the DTE monitor. This is called local character echo.
DTE CHARACTER ECHO: E
To determine if echo is set properly, type AT. If the terminal displays AT, echo is set correctly. If it displays AATT, then echo should be disabled by typing ATE. If the terminal does not display the AT at all, echo should be enabled by typing ATE1. The echo option only affects command mode operation.
COMMAND STATEMENT BUFFER
The TA temporarily stores up to 128 characters in a memory buffer. If more than 128 characters are entered before the end-
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