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4 AT Commands, S-Registers, and Result Codes
49
Command: A/ Repeat Last Command
Values: n/a
Description: Repeat the last command string. Do not precede
this command with AT. Do not press ENTER to
execute.
Command: B
n
Communication Standard Setting
Values:
n
= 0–3, 15, 16
Default: 1 and 16
Description: B0 Select ITU-T V.22 mode when modem is at 1200
bps.
B1 Select Bell 212A when modem is at 1200 bps.
B2 Deselect V.23 reverse channel (same as
B3
).
B3 Deselect V.23 reverse channel (same as
B2
).
B15 Select V.21 when the modem is at 300 bps.
B16 Select Bell 103J when the modem is at 300 bps.
Command: C
n
Carrier Control
Values:
n =
1
Default: 1
Description: C0 Transmit carrier always off. (Not supported.)
C1 Normal transmit carrier switching (included for
backward compatibility with some software).
Command: D
s
Dial
Values:
s
= dial string (phone number and dial modifiers)
Default: none
Description: Dial telephone number
s
, where
s
may up to 40
characters long and include the 0–9, *, #, A, B,
C, and D characters, and the L, P, T, V, W, S,
comma (,), semicolon (;), !, @, ^ and $ dial string
modifiers.