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AT Command Set and S-Registers
14-33810-A2-GB30-20 November 1996
AT Command Format
AT
commands are entered in Command mode using the
following format:
TYPE: ATXn
Where: X
is the A
T command and n
is the
specific value for that command.
PRESS: Enter
In Table 14-1, the value for X
is listed in the
AT Command column and the value for n
is listed in the
Description column.
Table 14-1
(1 of 12)
3800 Series AT Commands
AT
Command
Description
Front Panel
Branch
A/ Repeat Last Command
Re-executes last command string. (Not to be preceded with AT or followed by
pressing the Return key.)
Call Setup\Answer
A Answer Mode
Goes off-hook and attempts to establish a connection without waiting for a ring.
None
B
n
CCITT/Bell Mode
Determines the protocol used if the dial-line rate is set to 300 or 1200 bps. It
has no effect if the rate is set to another value. (See %B.)
B, B0 V.21 or V.22 (300 or 1200 bps)
B1 Bell 103 or Bell 212A (300 or 1200 bps)
The factory default is B1.
D
n
Dial
Begins the dialing sequence. The dial string
n
(modifiers and telephone
number) is entered after the D command.
Any digit 0–9, * , # , A, B, C, D, may be dialed as a DTMF tone. Only the digits
0–9 can be dialed in Pulse Dial mode.
The following example shows how to dial through a PBX. The dial string
consists of the command string and the telephone number:
None
ATD9W
5551234
Command Telephone
String Number
Dial String
Modifiers include the following parameters:
T
–
Tone (DTMF) dial. Any digit 0–9, * , #, A, B, C, or D can be dialed as tone.
P
–
Pulse dial. Only the digits 0–9 can be dialed in Pulse Dial mode.
NOTE: Once a dialing method (tone or pulse) has been specified, it will only
remain active until the end of that dial string. The factory setting is tone
dial.
,
–
Pause. Causes the modem to pause before processing the next character
in the dial string. The length of this pause is determined by the setting of
the Pause Time configuration option (see Line Dialer configuration option
group) or by value held in S-register S8.