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4 AT Commands, S-Registers, and Result Codes
33
AT Commands
Command: AT Attention Code
Values: n/a
Description: The attention code precedes all command lines except A/ and
the escape sequence.
Command: ENTER Key
Values: n/a
Description: Press the ENTER or RETURN key to execute most commands.
Command: A Answer
Values: n/a
Description: Answers an incoming call before the final ring.
Command: A/ Repeat Last Command
Values: n/a
Description: Repeats the last command string. Do not precede this com-
mand with AT. Do not press ENTER to execute.
Command: B
n
Communication Standard Setting
Values: n = 0 or 1
Default: 1
Description: B0 Selects ITU-T V.22 mode when the modem is at 300 or 1200
bps.
B1 Selects Bell 212A when the modem is at 300 or 1200 bps.
Command: D
s
Dial
Values: s = dial string (phone number and dial modifiers)
Default: none
Description: Dials telephone number s, where s may up to 40 characters
long and include the following dial string modifiers. Spaces,
parentheses, and hyphens are ignored.
0–9 Digits 0 through 9
* The “star” digit (tone dialing only)
# The “pound” digit (tone dialing only)
A–D A, B, C, and D tone digits. Country specific; some countries
may prohibit these digits.
L Redial last number. (Must be placed immediately after ATD.)
P Select pulse-dialing until a T is encountered. Affects current
and subsequent dialing.
T Select tone-dialing until a P is encountered. Affects current
and subsequent dialing.
W Wait for a new dial tone before continuing to dial. (X2 or X4
must be selected.)
, Pause during dialing for time set in register S8.
; Return to command mode after dialing. (Place at end of
dial string.)
! Hook flash. Causes the modem to go on-hook for the time
specified in S29, then off-hook again .
@ Wait for silence. Causes the modem to wait for 5 seconds of