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4 AT Commands, S-Registers, and Result Codes
23
MultiModemZPX User Guide
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. This
action is frequently abbreviated <CR>.
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 = 0–3, 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: 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, W, S, comma (,), semicolon (;), !, @, ^ and $ dial string
modifiers.
Dial string modifiers:
L Redial last number. (Must be placed immediately after ATD.)
P Select pulse-dialing until a T is encountered. Affects cur-
rent 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, X4,
X5, X6, or X7 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 one-half
second, then off-hook again.