AP72-01 Page 2 Issue 6
AT / AD Command Set
AT
Attention
This is the prefix for all AT commands. Typing AT by itself (followed by a carriage
return) will result in the "OK" message being displayed and no other action being performed. It
is good practice to use this command to check that your terminal software is communicating
correctly. You should always receive the "OK" message.
All of the AT commands that follow are documented in their full format, i.e. the AT
prefix has been included for clarity.
ATA
Answer
This command causes the Terminal Adaptor to answer an incoming call. The Terminal
Adaptor will attempt to connect with a remote calling Terminal Adaptor if present. When
connected, a connect message will be displayed. If a connection is not achieved then the "NO
CARRIER" message will be returned.
ATD
Dial
ATD causes the Terminal Adaptor to dial a number according to the dial string
supplied.
0-9
These are the digits to be dialled.
L
Last number re-dial. The Terminal Adaptor will re-dial the last number entered
(stored in S102). The L must be the first character after the D and any
subsequent characters will be ignored.
S
Dials the number stored in the directory. See the AT&Z command for details
of how to store a telephone number into the Terminal Adaptor's directory.
#
Added after the main number, this dials a given sub-address of that main
number.
ATE
Echo Control
Default:
1
The ATE command is used to control the echoing of commands to the DTE when the
Terminal Adaptor is in command mode.
ATE0
Command echo disabled
ATE1
Command echo enabled
