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AT Command Set and S-Registers
14-53910-A2-GN32-40 September 1998
Table 14-2
(1 of 10)
391x Series AT Commands
AT
Command
Description
DCP LCD
Command
Sequence
A/ Repeat Last Command. Reexecutes 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
Dn Dial. Begins the dialing sequence. The dial string n (modifiers and
telephone number) is entered after the D command.
None
Any digit 0–9, *, or # 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:
ATD9W5551234
Modifiers include the following parameters:
T — Tone (DTMF) dial. Any digit 0–9, *, or # can be dialed as
tone.
P — Pulse dial. Only 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 modem
defaults to the value set by the Dialer Type configuration option.
, — 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 (refer to the Line Dialer configuration option group)
or by value held in S-Register S8.
W — Wait for dial tone. The modem waits for a second dial tone
before processing the dial string. This can be the initial dial
tone or can be used when dialing through a tandem PBX.
For example, 9W 555-6789.
R — Reverse Dial mode. Causes the originating modem to
send out an answertone once it no longer detects
ringback. (Ringback is the ring you hear at the originating
site when making a call.) The R parameter must be the last
character in the dial string. For correct operation, at least
one ringback must be detected; therefore, the remote
modem should be configured to answer on the second ring
or subsequent rings.