AT C
OMMANDS AND
S R
EGISTERS
Using AT Commands
AT commands are used to change your ISDN TA’s settings. They are sent using
communications software’s terminal mode.
If you are using third-party communications software, consult the users manual for
information on using terminal mode. If you are using the ControlCenter software that
came with your ISDN TA, click the Terminal icon to reach terminal mode.
To issue a command, type it (remembering to put the “AT” in front of it) and press
Enter. For example, type AT*S=1. Then press Enter.
To write commands to the ISDN TA’s permanent memory, use the &W command.
The commands listed below are the only ones that do not require that AT precede
them:
Command:
Result:
A/
Re-executes the most recent command issued
A>
Repeats the most recent command until
canceled by pressing any key
+++
Returns your ISDN TA to command mode (Do
not press Enter after issuing this command.)
Default settings are listed in italics.
Basic AT Commands
Commands:
Results:
AT$
Help, command summary
ATA
Answer Data Call
ATDn
Dials a telephone number
n=0-9 Digits to dial
n=* Auxiliary tone dial digit
n=# Auxiliary tone dial digit
n=R Call an originate only
n=. Wait for a connection
n=; Remain in command mode
n=“ Dial alphanumeric phone numbers
n=W Wait for second dial tone (X3-X7)
n=@ Wait for an answer (X3-X7)
ATDn1&n2
Dial numbers n1 and n2
ATD.n1
Dial n1 for a X.25 AO/DI number
ATDL
Dial last phone number
ATSn
Dial stored number n
ATD$
Help for dial commands
ATEn
n=0 No command echo
n=1 Echo command characters (default)
ATFn
n=0 Online echo
n=1 No online echo (default)
ATHn
n=0 On hook (ready to accept calls)
n=2 Reject incoming calls
ATIn
Information screens